Astroblog

Eastern evening sky at 9:00 pm ACST, 24 June - 14 July showing the path of comet C/2013 X1 as seen from Adelaide. The positions are for the 24th, 29th, 4th, 9th, and 14th (getting higher as the month wears on). Similar views will be seen elsewhere in Australia at the equivalent local time (and most of the Southern Hemisphere). Click to embiggen.

The good news is that Comet C/2013 X1 (PANSTARRS) is now high in the evening sky to be visible without having to stay up past midnight. The comet was closest to the earth on June 21, so should be at it's brightest over the next few days. The bad news is (apart from most of Australia being hit by severe storms for the next few days) is that it is too close to the Moon until the 24th to be easily seen.

Comet C/2013 X1 seen using the remote iTelescope T12 at Siding Springs Observatory on 13 June.

The most recent reports had it around magnitude 6.2, just below unaided eye visibility and bright enough to be seen readily in binoculars  (10x50's should work well). Over the next three weeks it will fade, and may have fallen to magnitude 7 (still visible in good binoculars) by the middle of July.

Comet C/2013 X1 is showing a nice double tail in deep telescopic imaging, and there was a recent spectacular tail dissociation event as well, but with visual observation the comet is more like a ball of cotton wool with a green tinge. It is at a suitable height for viewing from around 9 pm to astronomical twilight in the morning.


Printable black and white spotters map of the eastern evening sky at 9:00 pm showing the track of comet C/2013 X1 over the next 3 weeks. Click to embiggen and print

Ironically, the comet is currently in the constellation Telescopium (the telescope). Being close to earth (well. 0.64 AU, a little over half the distance from the Earth to the Sun) it is moving rapidly night to night for the next few weeks, passing through Ara the Altar, Norma the compass and Lupus the wolf.

It is close to a number of brightish stars, unfortunately in rather obscure constellations (see above), but not far from some distinctive constellations (Sagittarius and Scorpius), which makes it relatively easy to star hop to for most of June and July.

At 9:00 pm (when the sky is full dark and the comet is well above the horizon). almost directly above the eastern horizon is recognisable "teapot" of Sagittarius, with the curl of Scorpius above it.

From the 24th-27th locate the brightest star in the Teapot (Kaus Australis, epsilon Sag, at the base of the "spout"). With binoculars, sweep to the south a little over two binocular fields, past the curve of stars that is Corona Australis, and within that area the only fuzzy blob will be the comet. On the 26th the comet will be near the brightish star Zeta Telescopii.On the 27th the comet will be next to the brightish star Theta Ara (see the binocular charts).

Black and white binocular chart suitable for printing, showing a higher power view of the area around the comet from 24 June to 1 July. Use in conjunction with the spotters map above. The circle is the field of view of 10x50 binoculars. Click to embiggen and print.

Printable PDF maps of the spotters map, the binocular map  for June 24- July 1 and the binocular map  for July 1 to July 14



From the 28th to the 1st of July sweep south of the tail of Scorpius by about a binocular field. On the 28th and 29th the comet is in the same binocular field as the beautiful and bright globular cluster NGC 6397. There will be two fuzzy blobs on display. On the 29th the comet is close to the bright star Alpha Ara.

From now on the task of finding the comet is more difficult, the comet is fading, there are fewer bright guide stars, and lots of faint clusters that can be confused with the comet, the only real way to tell them apart is to watch for the comet moving night to night (or over the course of the night, if you want to stay up for hours).

Black and white binocular chart suitable for printing,  showing a higher power view of the area around the comet from 1 July to 14 July. Use in conjunction with the spotters map above. The circle is the field of view of 10x50

From the 3rd to the 6th, sweep diagonally up and south from the cluster of stars in the tail of Scorpius call the "false comet" for obvious reasons, or table of Scorpius, by between one to one and a half binocular widths. On the 4th the comet is close to Epsilon Norma, and on the 6th close to Delta Norm.

From the 6th  to the 12th the comet is roughly in the middle between bright red Antares and orange alpha Centauri.

From the 9th to the 12th it will be better to look for the comet later in the night, after the Moon sets. On the 9th and 10th it is close to the brightish star omega Lupi and on the 12th and 13th it is close to the bright star Delta Lupi. From the 14th the combination of waxing Moon and fading comet will mean the comet will be extremely difficult to spot with binoculars, and by the time the Moon is waning the comet is likely to be visible only in telescopes.

Cloud cover predictions can be found at SkippySky.
Here is the near-real time satellite view of the clouds (day and night) http://satview.bom.gov.au/

Labels: binocular, C/2013 X1, comet

Comet C/2013 X1 PanSTARRS as seen at 2 am facings east from Adelaide. Similar views will be seen elsewhere in Australia at the equivalent local time. Click to embiggen.

Comet C/2013 X1 PanSTARRS is brightening and is around magnitude 6.4, which is just below undaided should be easily detectable in binoculars as a fuzzy blob. The comet is near the Aquarius - Piscinus Austrinus border, just across from the bright star Fomalhaut by about two binocular diameters.

For the next few days (4 - 6 June) the comet is close to the iconic Helix Nebula. At magnitude 7.3, this low surface brightness nebula may be seen as a small disk in binoculars. The comet is closest on June 4 at 11:50 pm AEST when it is just half a moon diameter away. However, although the comet rises before 11 pm  observers will need to wait until after 1 am on the 5th for the comet and nebula to rise above the horizon  murk and be clearly visible.

Printable black and white map suitable for locating comet C/2013 X1 PanSTARRS, the large circle is the field of view of 10x50 binoculars, the smaller on the FOV of a 24 mm eyepiece for a 114 mm Newtonian reflector.

Us the chart above to find Fomalhaut, then hop over northwards by about two binocular widths to find the comet. The first reasonable bright star you come to is upsilon Aquarii, and the comet is not far from that star.

Ironically, you may need to find the comet in the telescope to locate the nearby nebula, which is harder to see in a telescope eyepiece than in binoculars.

Labels: binocular, C/2013 X1, comet, telescope

Eastern morning sky at 4:00 am ACST, 16 May as seen from Adelaide. Similar views will be seen elsewhere in Australia at the equivalent local time (and most of the Southern Hemisphere). Click to embiggen.

Comet C/2013 X1 (PANSTARRS) is now high enough above the horizon murk to be readily visible before twilight.  It is currently around magnitude 7, bright enough to be seen readily in strong binoculars (the latest sighting was in 11x70mm Binoculars, but 10x50's should work as well). Over the weeks it will brighten possible to magnitude 6, where it will be (just) visible to the unaided eye under dark skies.

Comet C/2013 X1 is showing a nice double tail reminiscent of C/2013 US10 Catalina in deep telescopic imaging, but with visual observation is is more like a ball of cotton wool. It is at a suitable height from around 4 am to astronomical twilight.

Printable black and white map of the eastern morning sky showing the track of comet C/2013 X1 over the coming month. Click to embiggen and print

The comet is in Aquarius, and is close to a number of distinctive stars which makes it easy to star hop to for most of May.

Directly above the eastern horizon is the reasonably bright star Fomalhaut. With binoculars, sweep down diagonally to the north around four binocular fields until you reach the distinctive grouping of Phi and Psi Aquarii. Phi and the double star Psi Aquarii form a distinctive triangle. Over the next few days the comet will lie between these stars.

Black and white binocular chart suitable for printing,  showing a higher power view of the area around the comet. Use in conjunction with the spotters map above. The circle is the field of view of 10x50 binoculars. Click to embiggen and print.

Printable PDF maps of the spotters map, and the binocular map 



For the first week the comet will be within the same binocular field as Phi and Psi Aquarii. For the next week, sweeping back up from Phi and Psi Aquarii towards Fomalhaut will bring you to the comet.

Unfortunately, while the comet is brightening, the waxing Moon set later and later, by the 19th the Moon is setting when the comet is a good hight to view. The Moon is full on the 22nd, making it hard to see the comet. While the Moon wanes after this it comes closer to the comet, and on the 29th and 30th the last quarter Moon is just under two hand-spans from the comet, so it may be difficult to spot in the Moonlight. After this the comet should be readily visible again.

Cloud cover predictions can be found at SkippySky.
Here is the near-real time satellite view of the clouds (day and night) http://satview.bom.gov.au/

Labels: binocular, C/2013 X1, comet

Location of comet C/2013 X1 (PANSTARRS) as seen looking north-west from Adelaide at astronomical twilight, and hour and a half after sunset. The comet is just below Chi and Gamma Peg (indicated). Click to embiggen.	Location of comet C/2013 X1 (PANSTARRS) as seen looking north-west from Brisbane at astronomical twilight, and hour and a half after sunset. Ignore the time on the image, it is a Stellarium bug. Click to embiggen.	Location of comet C/2013 X1 (PANSTARRS) as seen looking north-west from Darwin  at astronomical twilight, and hour and a half after sunset. Ignore the time on the image, it is a Stellarium bug. Click to embiggen.

Comet P/2013 X1 (PANSTARRS) is reported to be in outburst at magnitude 8.1 or brighter (there have been reports in the high 7's but I haven't seen them directly). This makes the comet potentially visible in binoculars, and rather obvious in telescopes.

Unfortunately for Australians the comet is currently in the Great Square of Pegasus, forming a triangle with Gamma and Chi Pegasi. This means that it is very low to the horizon, and can only be seen for a short time after astronomical twilight in the evening before it becomes too low.


Black and white printable map suitable for use with binoculars or a telescope. The stars Gamma nd Chi Pegasi (indicated on the chart above) are shown for orientation. The large circle is the filed of view of 10x50 binoculars, ad the small circle the FOV of a 24 mm eyepiece on a 114mm Newtonian reflector. Click to embiggen and print. 

Southern Australia has the worst view, with the comet only 10 degrees or a little bit more above the horizon, where horizon murk will make it harder to see.

Northern Australia has the best views with the comet 20 degrees above the north-west horizon at the latitude of Brisbane at astronomical twilight, and 41 degrees above the north-west horizon at the latitude of Darwin at astronomical twilight.
 
My image of C/2013 X1 taken with the iTelescope remote scope T20 in New Mexico on the 4th.

Labels: C/2013 X1, comet