Home > Comets > Comet C/2013 A1 Siding Spring glides past the globular cluster M92 29/3/15

Comet C/2013 A1 Siding Spring glides past the globular cluster M92 29/3/15

SidingSpringstackedcrop2altComet C/2014/A1 Siding Spring passing M92 (comet is faint grey fuzzy tail and coma to right of cluster)

Comet Siding Spring was discovered by Robert H. McNaught at the Siding Spring observatory in Australia on January 3rd 2013. Never one of the brightest comets, it reached a peak magnitude of 9 in December 2014 and is now fading as it moves out of the Solar System. Current magnitude estimates put it at 14.7, so you will only see this with large aperture telescopes.

I happened to notice it was passing the globular cluster M92 in Hercules in the early hours of yesterday morning and took this quick image as a record of its passage.

M92 was discovered by Johann Elert Bode in December 1777. It is 27,000 light-years distant and contains about 400,000 stars. Like most metal-poor globular clusters it is extremely old and current estimates put its age at 14.2 billion years, which is pretty much the age of our universe ! This cluster is often overlooked for the more famous and visually larger M13 cluster, but is a visually pleasing and interesting object nonetheless. Using just the eye a 4″ to 5″ telescope will resolve a few outer stars, but to resolve the whole cluster you will need a 12″ or larger telescope. The whole cluster resolves easily with digital imaging in wide view telescopes of 3″.

Image taken 29/3/15 3.58am New Mexico time (9.58am UTC) on iTelescope T20 (Takahashi 106mm, Camera: FLI ProLine PL11002M) RA: 17h 17m 00.0s DEC: 43° 26′ 00″ (J2000)

Orbital TrackCurrent orbital track location of comet C/2013/A1 (light blue line) as it leaves the Solar System

Advertisements
  1. No comments yet.
  1. No trackbacks yet.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: