OTHER INTERESTING FAINTER COMETS
(most recent at the top)
C/2017 T3 ATLAS. 2018 July 9 at 20:10UT. Large aperture photometric V mag = 9.8
Comet C/2017 T3 ATLAS recovered post solar conjunction.
2018 June 20 at 20:22UT.
Approximate large aperture photometric V magnitude = 9.5
Solar elongation = 21 degrees.
Altitude = 6 degrees.
Comet 364P PANSTARRS (right) rendezvous with Star clusters M46.M47 in Puppis.
Comet 66p du Toit peaked at 10th magnitude in June 2018.
66p du Toit and the Grus galaxy chain (IC1459).
2018 May 16 at 18UT.
I observed the comet visually at approximately magnitude 11.0 through 25x100mm binoculars. The 5' coma was very diffuse.
Below: C/2016 R2 PANSTARRS.
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.
Below: Comet 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.
Above: 73P Schwassmann-Wachmann on 2017 March 18 (fragment too close to resolve)
Above: New comet C/2017 E1 Borisov discovered on 2017 March 1.
preliminary designation gb00099 on the Possible Comet Confirmation Page.
This confirmation image was taken on 2017 March 2.
Approximate magnitude 15. Discovered by Russian amateur astronomer G. Borisov.
Preliminary orbit has perihelion arrival on 2017 April 10 at 0.90AU from the Sun. It was expected to brighten to about 10th magnitude.
Above: 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/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 appearing 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.
2013 UQ4 is in a 467 year, retrograde orbit, with perihelion on 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.
C/2012 V2 LINEAR
Left: 2013 Aug 9.82 UT
Right:2013 Oct 8.75UT
Canon 60Da and 300mm EF zoom lens cropped. 4x2min exposures.
C/2012 K5 LINEAR
2013 Jan 2.48 UT
Canon 300d, 5x2 minute stack. This long period comet (approximately 20,000 year orbit) is having a highly favourable appearance during January.
Perihelion (closest approach to the Sun) occurred on 28 Nov 2012 at a distance of 1.14AU.
It is closest to the Earth on New Years Day at 0.29AU.
Restricted to northern hemisphere observers prior to 2013, comet LINEAR rapidly heads southward during January,
travelling about 2 degrees per day. As a bonus, moonlight will not interfere for the first 2 weeks of January.
At the start of the month, you will find the magnitude 8 comet situated in Auriga, not far from Beta,
but elevation is quite low over the northern horizon after dusk. On the evening of the 3rd, it is a degree NE of
star cluster M36. On January 6, it is 1 degree east of star cluster NGC 1746 in Taurus.
On the 8th, the now magnitude 9 comet is about 4 degrees East of Aldebaran. Moonlight interferes from Jan 19
and the now magnitude 10 comet will be situated in Eridanus. By the end of January, the comet has faded to magnitude 11.
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 imagery by R Matson.
Recovery and first return of lost periodic comet D/1827 M1 Pons-Gambart, with an orbital period 188 years.
2012 Oct 13.46UT
20x15 second exposures, Starlight Express MX7c imager + C11 at f/3.3.
168P Hergenrother in outburst.
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
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.
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
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.
Left: 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
2004 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.