(most recent at the top)

C/2023 S3 Lemmon

New comet C/2023 S3 Lemmon on 2023 November 12 at 12:00UT.
using a C11 RASA f/2.2 + Canon 6D. 10 mins. FOV 30'. from Swan Hill, Victoria, Aus.
magnitude estimate 14.5-15.0, coma approx 2'
Not expected to get brighter than magnitude 15, however it should be monitored carefully as it is periodic in nature (~150yrs)
with a perihelion of 0.83AU on 2024 January 19th.
Periodic comets tend to brighten rapidly at the perihelion point.
It will also be a favourable southern comet, trekking through Sculptor and Grus during November-December 2023.

C/2023 S2 ATLAS

2023 October 01 at 10:10UT using a C11 RASA f/2.2 + Canon 6D. 5 mins. FOV 30'. North up. from Swan Hill, Victoria, Aus.
Total UCAC 4 V mag = 13.0 with a 2' coma.
Perihelion is on 2023 October 15 at 1.07AU and is near peak brightness of 12th magnitude.
Unusual that it wasn't discovered earlier, but it may be a periodic comet brightening rapidly at the perihelion point.
During October, the comet will be situated in Ophiuchus , low in the evening sky.
During November the comet will be situated in Aquila fading from magnitude 13.


At the start of November, the magnitude 10 comet was situated high in the evening sky in Sagittarius.

At the start of October 2022, the comet was at its brightest (magnitude 9), situated high in the evening sky in Sculptor.
The comets approach to perihelion was offset by its increasing distance from the Earth, so the comet faded slowly during the month,
On October 3, the comet entered Grus. On October 16, the comet entered Microscopium

Closest to Earth on 2022 September 25 at 0.85AU.
Closest to Sun on 2022 November 28 at 1.59AU
Maximum magnitude 9.0 in October 2022
Orbital period: 79 years
This comet was discovered by the Near-Earth Object Wide-field Infrared Survey Explorer in infrared images obtained during Aug. 8-9 UT
Follow-up observations by ground based observers estimated a magnitude of 17.
3 weeks later, I heard a report that the comet appeared 13th magnitude!
This comet was brightening very fast, significantly brighter than the ephemeris magnitude.
On August 31st, I imaged the comet and estimated from the image a V magnitude of 12.4 and coma diameter of 5'.
On September 16th , I made a visual estimate of 11.2, using a 20cm reflector at 70x. The coma diameter was 5’ but appeared very diffuse.
On September 24th, I estimated 10.0 using 25x100mm binoculars and a 8’ coma.
The orbit is Halley type with orbital period of about 80 years, in a retrograde motion (opposite the direction of the planets).

73P-C on 2022 November 11. One month post outburst.

During early October, a significant outburst occurred. (brightening the comet to 10th magnitude).
Presumably this will result in more fragments to follow.

73P Schwassmann-Wachmann 3
This comet experienced a major outburst and fragmentation episode in 1995, where it reached 5th magnitude.
On 2022 May 31st, the Earth encountered the meteoroid stream left in the wake of the 1995 outburst.
The predicted timing of the shower was spot on, with a meteor shower reaching a Zenith Hourly Rate of 40 observed in USA.
The anticipated meteor storm did not eventuate, as the Earth cut through the stream well ahead of time,
which puts a constraint on the size of the meteoroid stream (important for predicting future encounters).
Since the 1995 outburst, there have been a total of >70 fragments identified. 73P A-Z, AA-AZ, BA-BT.
At its last appearance in 2017, it produced a new fragment (BT).
All of these fragments have since disappeared with the major component (73P-C) appearing to be the primary nucleus.
During 2022, a total of 5 new fragments were reported, all by an amateur astronomers Michael Jaeger and Gerald Rehmann!
These fragments (BU, BV, BW, BX, BY) were quite faint however, 19th magnitude. It goes to show what amateurs are capable of.
73P reached perihelion on 2022 August 25 at a distance of 0.97AU.
It was closest to Earth on September 21 at 0.96AU where it peaked at 11th magnitude.
During early October, a significant outburst occurred. (brightening the comet to 10th magnitude).
Presumably this will result in more fragments to follow.
During November, the comet trekked eastwards through Sagittarius, Microscopium and Pisces Austrinus.

C/2021 E3 ZTF
Closest to Earth on 2022 June 1 at 1.21AU.
Closest to Sun on 2022 June 11 at 1.77AU
Maximum magnitude 9 in June 2022
Orbital period: N/A Parabolic(dynamically new)
Discovered by the Zwicky Transient Facility, this comet brightened quickly on its way to perihelion.
Very unusual activity for a dynamically new comet, as they often underperform to expectations.
It was on track for a peak of magnitude 9 in June 2022, when situated deep in south circumpolar skies.
It reached -81 degrees declination on June 6th, when situated near the LMC in Mensa.
By July 1, the comet was situated in Carina, in the southwestern evening sky, fading to magnitude 10.0

C/2021 P4 ATLAS
This comet appeared to have disintegrated at perihelion (2022 July 30 at 1.08AU)
It showed a steady level of activity and was last seen in early July at 9th magnitude.
I attempted to recover the comet on 2022 Dec 130, and nothing was visible down to magnitude 17


Comet C/2021 O3 PANSTARRS barely survived its close encounter with the Sun.
This is a comet that has defied the Bortle survival limit for dynamically new comets.
Its intrinsic magnitude was 2 orders of magnitude below the survival limit for a perihelion of 0.28AU on 2022 April 21
However, its close Solar passage caused significant erosion
and the peak brightness of magnitude 9 was well below the predicted magnitude 6

C/2021 F1 Lemmon-PANSTARRS. 2022 February 08 at 13:08UT.
Taken remotely using I-TEL New Mexico T11 0.50-m @ f/4.5. 1 min. North right. FOV 20'. Coma 2.5', approximate mag 12.
This asteroid in a cometary orbit has recently been rebadged as a comet after now displaying a coma. (CBET5095)
Perihelion occured on 2022 April 6 at 0.99AU, unfortunately when on the far side of the Sun.
Initially visible in the northern hemisphere, it peaked at 8th magnitude during March 2022

C/2019 T4 ATLAS
This distant comet peaked at magnitude 11 during May 2022.
It was at perihelion on 2022 June 8 at 4.24AU

C/2019 L3 ATLAS
Closest to Earth on 2022 Jan 6 at 2.58AU
Closest to Sun on 2022 Jan 9 at 3.55AU.
Maximum magnitude 9.0 in Jan 2022
Orbital period: N/A Parabolic
This large, distant object has surprised many with its rapid rise to prominence.
I wish this comet had a much closer perihelion distance!
It was closest to Earth and Sun virtually within a few days, quite a remarkably favourable appearance.
At the start of January, the magnitude 9 comet was situated in Gemini, rising at 930pm, but transiting north at 2am local time.
It moved slowly south-westwards during January, improving in visibility each night.
At the start of February, the strongly condensed magnitude 9 comet remained in Gemini near star cluster NGC2266.
Its southward motion saw visibility improve throughout the month.
Post perihelion, the comet faded very slowly, such that it was still 11th magnitude a full year later!

19P Borrelly
Closest to Earth on 2021 Dec 11 at 1.17AU.
Closest to Sun on 2022 Feb 1 at 1.30AU.
Maximum magnitude 8 in Jan 2022.
Orbital period: 6.85yrs.
This comet was discovered in 1904 and this was the 17th observed return, a reasonably good one.
The target of the Deep Space 1 mission in 2001, this 8km bowling pin shaped comet peaked at magnitude 8 in January.
Southerners were favoured pre-perihelion before moving northwards.
At the start of January, the magnitude 9.5 comet was situated in Cetus in the evening sky
It moved into Pisces on January 31st.
At the start of February, the magnitude 9.0 comet was situated in Pisces in the evening sky trekking slowly north-eastwards.
Its altitude reduced quickly during the month as it disappeared north.

104P Kowal
Closest to Sun on 2022 Jan 11 at 1.07AU.
Closest to Earth on 2022 Jan 28 at 0.63AU
Maximum magnitude 9 in late Jan 2022.
Orbital period: 5.74yrs.
This comet had a close encounter with Jupiter in May 2019, which reduced its perihelion distance from 1.2 to 1.07AU.
In fact this comets perihelion distance has been reducing gradually, such that it will be inside the earth’s orbit from 2033,
offering very favourable close approaches.
The comet will pass 0.15 AU and 0.14 AU from the Earth on 2039 Jan. 14 and 2049 Oct. 23, respectively,
making it a potential future naked eye comet.
In early January, I estimated it brighten from 10.3 to 9.7. This was already looking promising.
Comets behave differently when subject to reduced perihelion distance.
The comet peaked at 9.0 in late January 2022

57P du Toit-Neujmin-Delporte
peaked at magnitude 11 in November 2021

6p d’Arrest
Closest to Earth on 2021 Aug 1 at 0.74AU
Closest to Sun on 2021 Sep 17 at 1.35AU.
Maximum magnitude 10 in Sep-Oct 2021
Orbital period: 6.54yrs. Discovered in 1851, this is the comets 20th observed return.
The light-curve is very unusual in that it peaks some 2 months after the perihelion point.
On October 1, the magnitude 10.0 comet was situated in Sagittarius, about 30’ south of Phi Sgr.
On October 15, the comet was situated next to mag 6.3 globular cluster M55.
The comet entered Microscopium on the 28th, and on the 29th was 10’ north of magnitude 12 spiral galaxy NGC 6925.

67P Churyumov-Gerasimenko
Closest to Sun on 2021 Nov 2 at 1.21AU.
Closest to Earth on 2021 Nov 12 at 0.41AU
Maximum magnitude 8 in Nov 2021.
Orbital period: 6.43yrs.
This comet was the target for the successful Rosetta space mission in 2015. In 2021, it made its 9th observed return.
This was the most favourable appearance for quite some time.
My visual estimate using a 20cm reflector on 2021 Sep 4 was 11.6, with a moderately condensed coma 2’ wide.
My image shows a dust tail 12’ long in PA 252, very similar in appearance to 4P.
At the start of October, the magnitude 10.0 comet was in Taurus, in the morning sky before dawn.
On the mornings of Oct 16-17, it was within 30’ of star cluster M35 in Gemini.
At the end of October, the comet had brightened to magnitude 9.5.
It crosser into Cancer on November 14th and was 1.8 deg south of Iota Cnc by month’s end,
where the comet reached peak at slightly brighter than mag 9.0

4P Faye
Closest to Sun on 2021 Sep 8 at 1.61AU.
Closest to Earth on 2021 Dec 6 at 0.94AU.
Maximum magnitude 10 in Sep-Oct 2021.
Orbital period: 7.48yrs.
Discovered in 1843, comet Faye had its 23rd observed return.
A near pass to Jupiter in 2018 reduced its perihelion distance slightly
My visual estimate using a 20cm reflector on 2021 Sep 4 was 11.0, with a moderately condensed coma 2’ wide.
My image shows a dust tail 15’ long in PA 270.
At the start of October, the magnitude 10 comet was situated in the northern part of Orion, rising after midnight.
Best viewing occured during the first 2 weeks of the month. It crossed into Gemini on the 15th, then into Monoceros on the 31st.
4P maintained a steady brightness of mag 10.0 as its motion away from the Sun was compensated by its motion towards Earth.

8P Tuttle
Closest to Sun on 2021 Aug 27 at 1.02AU.
Closest to Earth on 2021 Sep 12 at 1.81AU.
Maximum magnitude 8.5 in Sep 2021.
Orbital period: 13.6yrs.
In 2008, I observed 8P Tuttle with the naked eye, estimating 5th magnitude, during a very favourable appearance.
See my story at http://www.members.westnet.com.au/mmatti/webpage/8p_tuttle.htm
In 2021, it was situated on the opposite side of the Sun, slowly emerging from morning twilight during September.
I recovered the comet on 2021 Sep 4 at 18:30UT estimating it at magnitude 9.1 with a moderately condensed coma 3’ wide.
The comet next returns in 2035 April 18 but the 2048 return will be very favourable (reaching naked eye once again)

Closest to Earth on 2021 May 12 at 1.41AU.
Closest to Sun on 2021 July 11 at 2.05AU.
This comet reached a maximum magnitude of 9 during July 2021.
Orbital period: 5200 years

252P LINEAR 2021
The nearly forgotten comet. This is a story of how amateur astronomers can play a part in cometary science.
In March 2016, comet 252P LINEAR achieved naked eye brightness, to the surprise of many, including myself.
Read my full story on this apparition at http://www.members.westnet.com.au/mmatti/webpage/252P%20LINEAR.htm
On August 7th, 2021, I realised that the comet had already arrived at perihelion on 2021 July 11th, with no mention of it.
I checked my Guide 9 software which, according to the Minor Planet Centre prediction, listed the comet at magnitude 19.
If the comet behaved as it did in 2016, it should actually appear at magnitude 11.0, situated low in the evening sky for southerners.
I sent an alert to fellow comet observers. Rob Kaufman confirmed it on 2021 August 8, some 14’ west from the MPC predicted position.
I followed up with a visual observation on 2021 August 9 at 09:15UT, estimating mag 11.4, using a 20cm reflector, at low altitude.
Using a C11 RASA f/2.2 + Canon 6D and a series of 30 second exposures, I submitted astrometry to the MPC.
The comet was announced on CBET 5018, which indicated that recovery observations in January 2021 by the
Lowell “Discovery Telescope” were not of the comet. The correction of perihelion prediction was +0.80 days.
252P LINEAR will pass 0.05AU from the Earth once again on 2032 March 18, hopefully reaching naked eye visibility once more.

15P Finlay
peaked at magnitude 10 in August 2021.
No outbursts were detected during this apparition.
The first meteoroids were detected from this comet on Sep 27th and Oct 7th, emanating from the constellation of Ara.

7p Pons-Winnecke on 2021 June 3. 2 days post-outburst. Note the sharp parabolic hood.

7P Pons-Winnecke on 2021 June 7. Note the minor outburst has dissipated one week later.

7P Pons-Winnecke
peaked at magnitude 10 in July 2021. It experienced several minor outbursts during the year.

C/2020 R4 ATLAS
peaked at magnitude 8 in April -May 2021
It arrived at perihelion on 2021 March 2 at 1.03AU and later closest to Earth on 2021 Apriil 26 at 0.46AU
Orbital period 997 years

On February 10, it was in close proximity to the nebulous complex of NGC 2245/2247, IC446/447
and Hubble Variable Nebula as shown above

This comet was discovered on 2021 January 3 by the NEOWISE infrared satellite.
As soon as it was posted on the possible comet confirmation page, I confirmed the comet on 2020 January 05 at 12:00UT
using a Celestron C11 RASA f/2.2 and QHY163m camera.
10x30sec exposures indicated a diffuse coma of 2’ with a nuclear GAIA broadband G magnitude of 14.8
I followed up with visual estimates using a 20cm reflector at 70x on 2021 January 6.50UT, m1=12.8, Dia 1’, DC2,
January 7.58UT, m1=12.2, Dia 2’, January 8.58UT, m1=11.9, Dia 2’. The comet was brightening rapidly.
Photo on 2021 January 08.52UT using a C11 RASA f/2.2 + Canon 6D. 10x30seconds, indicates a diffuse 4' coma.
Preliminary orbit indicated the comet reached perihelion on 2021 January 22 at 1.40AU
and was then closest to Earth around 2021 Feb 3 at 0.50AU. The comet peaked at magnitude 10.0 at this time.
On February 1, the comet was in the vicinity of star clusters M46 M47 in Puppis.
As the orbit is retrograde, the fast moving comet headed into Monoceros on Feb 3rd.



C/2019 N1 ATLAS
Peaked at magnitude 11 during December 2020, when well situated in south-eastern morning sky.
It has an orbital period of > 1 million years and perihelion distance of 1.70AU on December 1.

141P Machholz 2020
taken on January 8 showing the faint fragments circled
This comet discovered in 1994 has a history of cascading fragmentation.
It arrived at perihelion on 2020 December 16 at 0.81AU,  then was later closest to Earth on 2021 January 19 at 0.53AU.
It peaked at magnitude 10 during early January, when I estimated it at 10.3 with a 4’ coma.
The comets light curve is asymmetric, appearing brighter post-perihelion.
Michael Jaeger in Austria found a further 2 faint fragments about 30’ and 90’ East of the main component in CCD images,
but these were not visually detectable.
The outer component of 2020-2021 has been identified as component D in 1999 and component H in 2015
The newly identified middle component has been assigned component I.

398P Boattini
First return of a new periodic comet (5.5 year orbit), reaching 10th magnitude in January 2021

Not to be confused with C/2020 F3 NEOWISE,
C/2020 P1 was discovered on 2020 August 2nd by the Near Earth Object Widefield Infrared Survey Explorer
This object had a close encounter with the Sun on October 20th , at a distance of 0.35AU
The comet appeared intrinsically quite faint and was not expected to survive perihelion.
During early October 2020, the comet had brightened to magnitude 9, but was a very difficult object low in the evening sky.
I was able to photograph it, but not get a visual observation. The comet was quite condensed but small, with no tail.
It seems to have peaked at magnitude 8.5 and barely survived perihelion, when visible in STEREO HI1A.
It was recovered by Michael Jager on October 26 at magnitude 11.5

58P Jackson-Neujmin 2020 (recovery image)
Not seen since 1996, and missed at 2 returns, this comet underwent an outburst and was discovered in SWAN data by Hua Su,
then recovered by me on 2020 April 6 at 19:17UT . The comet was +2.4 days behind prediction.
Perihelion date was on May 27at 1.37AU, followed by an Earth approach on June 26 at 2.0AU.
The comet peaked at magnitude 10 in May 2020.

C/2019 Y1 ATLAS
was discovered on 2019 December 16 by the ATLAS survey.
Astrometry indicated that this comet belonged to the Liller family of comets, arising from a breakup of a larger object
about 3000+ years ago  (linkage identified by Reinder Bouma)
C/1988 A1 Liller, presumably the primary component, reached 5th magnitude in May 1988.
C/1996 Q1 Tabur also reached 5th magnitude in October 1996.
C/2015 F3 SWAN, reached 9th magnitude in April 2015.
C/2019 Y1 ATLAS reached 7th magnitude in mid April 2020, after experiencing an outburst.
Viewing was restricted to northern hemisphere observers.

C/2020 A2 Iwamoto
Was a new amateur comet discovered on 2020 January 8, which peaked at magnitude 10 in February 2020.
Images above were taken on 2020 February 6 using I telescope Sierra Nevada.

C/2018 W1 Catalina
appeared much brighter than MPC prediction during May 2019.
My visual observation on 2019 May 27.36UT; m1= 11.6, Dia=2’, DC=3...20cm reflector.
This is a Halley type comet with an orbital period of 101 years.
These objects typically brighten rapidly at the perihelion point. Perihelion occurred on May 12 at 1.35AU.
The comet was at maximum brightness and visible in the southwestern evening skies for southerners.

C/2017 S3 PANSTARRS in outburst. 2018 July 2 image.
Outbursts occurred on July 1 and July 14 (where it reached magnitude 7 at best).
Was not observable from the southern hemisphere.
Observable in STEREO A images at magnitude 9 during August 1 to 14 but probably disintegrated at perihelion

C/2016 M1 PANSTARRS and NGC 6388 on 2018 June 30
This comet peaked at magnitude 8 during this time.
Perihelion occurred on 2018 August 10 at 2.2AU

Comet 364P PANSTARRS on 2018 June 30

Comet 364P PANSTARRS (upper right) rendezvous with Star clusters M46.M47 in Puppis.

66p du Toit peaked at 10th magnitude in June 2018.

66p du Toit and the Grus galaxy chain (IC1459) on 2018 May 16 at 18UT.
I observed the comet visually at approximately magnitude 11.0 through 25x100mm binoculars. The 5' coma was very diffuse.

Peaked at magnitude 10 in January 2018.
It displayed frequent volatile outbursts of small amplitude. Comet appeared "Blue" due to high CO+ content.

C/2017 T1 Heinze on 2017 Dec 26.
Note the rapid movement in this 4 minute exposure. The dust tail shows curvature.
Comet was 0.35AU from the Earth at the time (closest at 0.22AU on 2018 January 4).
Comet Heinze appeared to have disintegrated at its perihelion passage in late February 2018.

Comet 185P Petriew on 2018 Feb 18.
peaked at magnitude 11, low in the western evening sky after sunset.

Above: 2017 Dec 26. 174P Echeclus in outburst at magnitude 13.
This distant comet has an orbital period of 35 years. It arrived at perihelion in 2015 at 5.84AU
It displays similar but less frequent outbursts to 29P Schwassmann-Wachmann

C/2017 O1 ASASSN.
Closest to Sun on 2017 October 14 at 1.50AU
Closest to Earth on 2017 October 18 at 0.72AU
Maximum magnitude 9 in October 2017
On 2017 July 19.32 UT, K. Stanek, Ohio State University, reported the discovery of a comet in the course of the
"All-Sky Automated Survey for Supernovae" (ASASSN) program, from images taken with the 14-cm "Cassius" survey
telescope at Cerro Tololo in Chile. The comet appeared magnitude 15.
Soon after this discovery was posted on the possible comet confirmation page PCCP, reports of a large coma were noted.
I made a visual observation on 2017 July 24.83 using 25x100mm binoculars, where the comet appeared at magnitude 10.5
with a very large diffuse coma 5' wide. It is very unusual in this day and age to see a comet at discovery, so bright.
The comet was located in Cetus, but much better situated for southern observers.
The comet likely had undergone a recent outburst.

73P Schwassmann-Wachmann on 2017 March 18 (fragment too close to resolve)

Comet C/2017 E1 Borisov  discovered on 2017 March 1.
This confirmation image was taken on 2017 March 2.
Approximate magnitude 15. Discovered by Russian amateur astronomer G. Borisov.
It arrived at perihelion on 2017 April 9 at 0.91AU from the Sun.
It brightened to about 10th magnitude at this time.

Comet C/2016 U1 NEOWISE fade out.
This apparently dynamically new comet survived its brush with the Sun on 2017 Jan 14 at 0.32AU
as it was seen in SWAN comet tracker images post perihelion but too close to the Sun for ground based observation.
The image above was taken on 2017 Feb 24 at 10:30UT using a Celestron C11 + Canon 60Da camera, 5 minutes of total exposure.
The comet is fainter than magnitude 15 in this image, where it was expected to have appeared magnitude 12.

C/2012 X1 LINEAR
2014 April 26.80 UT: Canon 5D Mk II, 400mm f2/8, cropped. 5x1 minute stack.
Perihelion occurred on 2014 March 4th at a distance of 1.60AU
It peaked at magnitude 8 at the time, with a very condensed nucleus

C/2013 UQ4 Catalina.
2014 July 2.79 UT: Canon 60Da camera and 300mm zoom lens cropped. 5x1 minute stack.
Visual magnitude m1=10.5, Coma Diameter=3', DC=1/2...20cm reflector

Asteroid 2013 UQ4 is a comet!
It appeared slightly diffuse in this image taken April 26 at 19:30UT
Image details: Canon 400mm lens f/2.8, canon 5D Mk II , 2 minute exposure. Site: Swan Hill, Victoria, Australia.
Approximate magnitude 13.5-14.0. Coma diameter is less than 1 arcminute
Guide 9 shows position of asteroid.
This was reported in CBET 3882 and rebadged as C/2013 UQ4 Catalina
It is in a 467 year, retrograde orbit, with perihelion occurring on 2013 July 5 at 1.08AU.

C/2013 V3 Nevski
2013 Nov 13.75UT
Comet was in outburst since discovery. Estimated visual magnitude = 8.9 with 6' coma, through 25x100mm binoculars.
Canon 60Da and 300mm EF zoom lens cropped. 4x2min exposures.
This is a periodic comet in a 45 year orbit. It faded rapidly after outburst at perihelion.
The comet will return in 2058 May 9

C/2012 V2 LINEAR on 2013 Oct 8.75UT
By October 8th, the comet was still as bright as magnitude 8.9 with a short tail.

C/2012 V2 LINEAR on 2013 Aug 9.82 UT
Canon 60Da and 300mm EF zoom lens cropped. 4x2min exposures. Field of view is 1 degree wide.

Comet C/2012 V2 LINEAR appeared conspicuous in SWAN images since first appearing on 2013 July 20.
On 2013 August 9.82UT, I confirmed both visually and photographically that this comet was much brighter than expected.
The magnitude predicted from the ephemeris was 12.5.
Using 25x100mm binoculars, I estimated it at magnitude 8.9 with a moderately condensed coma 3' wide. DC=6.
The comet was at perihelion on 2013 August 11 at 1.46AU

C/2012 K5 LINEAR
2013 Jan 2.48 UT
Canon 300d, 5x2 minute stack. 180mm zoom lens, cropped. Messier star clusters from left to right M38, M36, M37.
This long period comet (approximately 20,000 year orbit) had a highly favourable appearance during January 2013.
Perihelion (closest approach to the Sun) occurred on 28 Nov 2012 at a distance of 1.14AU.
It was then closest to the Earth on New Years Day at 0.29AU.
Restricted to northern hemisphere observers prior to 2013, comet LINEAR rapidly headed southward during January,
travelling about 2 degrees per day.
At the start of January, the magnitude 8 comet was situated in Auriga, not far from Beta, at low altitude.
On the evening of January 3rd, it was a degree NE of star cluster M36.
On January 6, it was 1 degree east of star cluster NGC 1746 in Taurus.
On the 8th, the now magnitude 9 comet was about 4 degrees East of Aldebaran.

C/2012 V4 Pons-Gambart
2012 Dec 1 at 11:18UT.
5x10 second exposures. C11 SCT and Starlight Express MX7c CCD imager.
Detected in SWAN images by R Matson.
Recovery and first return of lost periodic comet D/1827 M1 Pons-Gambart, with an orbital period 188 years.

168P Hergenrother in Outburst
2012 Oct 13.46UT
20x15 second exposures, Starlight Express MX7c imager + C11 at f/3.3.
This comet was predicted to appear magnitude 15.
My visual observation m1=9.8, Dia.=2', DC=7...20cm reflector at 67x
Comet appears as a small but highly condensed object , with a hint of tail in pa 190

144P Kushida
2009 Jan 24.5UT.
3x3 minutes combined exposure. Visual magnitude 8.6
144P Kushida was brightest in January 2009 and well visible in the evening hours.
It was magnitude 8.5, appearing large and diffuse, in the constellation of Taurus.

C/2008 A1 McNaught
2008 Sep 26.45UT.
Stack of 3x3 minute exposures, Canon 300D digital camera. 300mm zoom lens, cropped image. ISO 800.
Visual magnitude 7.0
The comet was closest to the Sun on Sep 29, 2008 at 1.07AU and achieved a peak brightness of magnitude 6.5 during September 2008
for observers in the southern hemisphere.

6P d'Arrest
2008 Nov 1.45UT.
A stack of 3x3 minute exposures, Canon 300D digital camera. 300mm zoom lens, cropped image. ISO 800.
Visual magnitude 9.5

177P Barnard
2006 July 21.5 UT.
6 minutes exposure. Canon 300D digital camera + 300mm telephoto lens. (cropped). ISO 1600. Field of View approximately 3 degrees wide.
Visually magnitude 9.0 with huge 15' coma. The first return of a periodic comet discovered in 1889. Orbital period is 119 years.

9P Tempel
9P Tempel 1 on June 27th 2005, prior to deep impact. 20x15 second exposures, Starlight Express MX7c imager + C11 at f/3.3.
Right: 9P Tempel 1 on July 4th at 10:15 UT, over 4 hrs post impact. 10x15 second exposures, Starlight Express MX7c imager + C11 at f/3.3.
Galaxy PGC 48179 is at top.
My observations indicate the nucleus brightened from mag 14.0 on June 27.45UT to mag 13.3 on July 4.40UT using USNO magnitudes for comparison.

C/2005 A1 LINEAR
Reached a maximum magnitude of 8 in April May of 2005.
Left: 2005 May 12.83 UT. 10x15 second exposures, Starlight Express MX7c imager + C11 at f/3.3.
Field of view: 15' wide  x 17' long. South is up and West is left.
Right: 2005 Aug 1. Note the split nucleus - a small secondary fragment is seen above the main nucleus.

C/2003 T4 LINEAR
and Helix Nebula on 2005 April 8.79 UT: 6x2min exposures, Canon 300D at ISO 1600 + 90mm lens.
Ion tail is close to 2 degrees long. Note the disturbance along the tail.
and below on 2005 April 12.81 UT: 5x2min exposures, Canon 300D at ISO 1600 + 205mm lens.

C/2003 T4 LINEAR
2005 May 12.82 UT: 20x15 second exposures, Starlight Express MX7c imager + C11 at f/3.3.
Note the spine in the antisolar direction which may be an Ion-tail disassociation event.
The Larsen-Sekania filter at right shows the spine in greater detail.
Field of view: 15' wide. South is up and West is left.

C/2003 K4 LINEAR
2004 Nov 16th.
Taken through a 135mm Hannimex lens at f/5.6 with a 2x1.5 degree FOV.
Note the brighter dust tail left and the fainter ion tail at right.

C/2004 R2 ASAS
Sep 18th.
Comet appeared magnitude 8 at the time,
but disintegrated before it reached perihelion on October 7 at 0.11AU.

C/2003 T3 Tabur
CCD image taken on October 22nd 2003. 7x20 sec exposures.
The comet is at top right along with galaxies NGC 6850 (bottom right) and IC 4933 (centre left)

C/2002 O7 LINEAR
CCD image taken on Sep 27th 2003 at 18:59 UT.
C11 telescope operating at f/3.3, 10x20 second exposures.
The image is equalised to draw out faint detail and indicates that the nucleus has totally disrupted.
What remains is a diffuse, sunward pointing "antitail" of debris.

C/2002 Y1 Juels-Horvocem
Left: rendezvous with galaxy NGC 1543 taken on July 29th 2003. 6x20 second exposures.
Right: CCD image taken on May 29th 2003. C11 telescope operating at f/3.3, 8x20 sec combined exposures.
Visual magnitude 8.0, Coma diameter 4'.

66p du Toit
rendezvous with galaxy NGC 5253 taken on August 15th 2003. 10x20 second exposures.

116P Wild 4
CCD image taken on May 3rd 2003. 8x20 second exposures.

2002 O6 SWAN
CCD image taken on Aug 7th 2002.