IC 688
DSS image of IC 688
Overlaid DSS image of IC 688, 30' x 30' with north at top and west to the right

Aladin viewer for the region around IC 688
PGC 156572, GSC 05508-01202, SDSS J112340.21-094744.7

Type  Unknown
Magnitude  15
Size  0.497' x 0.258' @ 100°
Right Ascension  11h 23' 40.3"  (2000)
Declination  9° 47' 44" S
Constellation  Crater
Classification  Sa
Observing Notes

Harold Corwin

IC 688 was found by Ormond Stone in January 1888. He measured it micrometrically (12 settings in RA, 2 in Dec), as did Frank Muller about a year later (12 RA settings, 4 Dec settings). They referred their two sets of measurements to the same star, and it is those that I've used to re-reduce the position. (Stone has another set of four measurements using another star, but he did only the RA; I've not reduced these, but they are consistent with the other measurements.) The position so reduced is within a couple of arcseconds of the 2MASS position, so there is no question about the identity of the galaxy.

Unfortunately, Wolfgang picked up a fainter galaxy 44 seconds of time further on east and called it IC 688. I did not catch this until I was loading the IC into NED early in 2005, so all my earlier lists have the wrong galaxy.
IC Notes by Harold Corwin
Other Data Sources for IC 688
Nearby objects for IC 688
5 objects found within 60'
NGC 3634 NGC 3635 NGC 3636
NGC 3637 NGC 3672
Credits...

Drawings, descriptions, and CCD photos are copyright Andrew Cooper unless otherwise noted, no usage without permission.

A complete list of credits and sources can be found on the about page

IC 688