NGC/IC Project Restoration Effort
(This is a very very beta version)
NGC5856
Basic Information
Location and Magnitude
Right Ascension: 15:7:20.3
Declination: +18:26:32
Constellation: BOO
Visual Magnitude: 6.0
Historic Information
Discoverer: Herschel W.
Year of discovery: 1791
Discovery aperture: 18.7
Observational
Summary description: Neb * 6 m (??)
Sub-type: *
Corwin's Notes
=====
NGC 5856 = ADS 9505 = WDS 15073+1827 = SAO 101379 is a double star with a
separation of 0.1 arcsecond (I presume it is a spectroscopic binary; see the
WDS for more). WH described the object this way: "A star 7.6m enveloped in
extensive milky nebulosity. Another star 7m is perfectly free from such
appearance." JH on the other hand, noted "A star of fully 6m, with a supposed
nebulous appearance about it, but of whose reality I cannot satisfy myself, as
it `blinks' with the star behind the wire." D'Arrest made three observations
of the star, but only suspected the nebulosity twice. Finally, Bigourdan saw
no nebulosity around the star on two different nights.
It is hard to reconcile WH's observation with a close double star -- his
description reads as if he saw a large diffused nebulosity. But there is
certainly no nebulosity around the star now. The spectrum of the brighter
component is that of a normal A2 V star with no emission noted. So, N5856
goes into the table as just a close double star.