IC 1990
DSS image of IC 1990
Overlaid DSS image of IC 1990, 60' x 60' with north at top and west to the right

Aladin viewer for the region around IC 1990
Ced 19m

Type  Bright Nebula
Right Ascension  3h 47'  (2000)
Declination  24° 19' N
Constellation  Taurus
Observing Notes

Harold Corwin

IC 1990 is part of the reflection nebulosity around the Pleiades. It was first noted by Stratonoff (AN 3366 = AN 141, 103, 1896) who found it on a plate exposed for 25 hours over nine nights. He describes it as a "straight wire between RA 03 40.7 and Dec +24° 04', and RA 03 41.9 with the same declination" (1896.0 positions precess to 03 46 53, +24 23.5 and 03 48 06, +24 23.3 for J2000.0). "Its width is about 20-30 [arcsec]." He adds that "The nebula is nearly parallel to the known nebula discovered by M. M. Henry, having the same form and found a little to the south."

This is a pretty good description of the area just north of Alcyone, though we now know of many other filaments and patches of nebulosity here. Stratonoff's declination is a little too far north (by about three arcminutes), and coincidentally, Dreyer applied the precession in declination with the wrong sign, so the NPD in the IC is incorrect -- that number should be "66 03", not "65 49".

The position I've adopted is more or less the center of Stratonoff's streak.
IC Notes by Harold Corwin
Other Data Sources for IC 1990
Associated objects for IC 1990
Nearby objects for IC 1990

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

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IC 1990