NGC/IC Project Restoration Effort
(This is a very very beta version)
NGC405
Basic Information
Location and Magnitude
Right Ascension: 1:8:33.6
Declination: -46:40:6
Constellation: PHE
Visual Magnitude: 7.1
Historic Information
Discoverer: Herschel J.
Year of discovery: 1834
Discovery aperture: 18.3
Observational
Summary description: eS, stellar, = * 7m
Sub-type: *
Corwin's Notes
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NGC 405 is a double star. It was found by John Herschel and is h2380 in his
Cape Observations. He has this to say about it: `[RA] 01 00 45.1: [NPD]
137 35 13 (1830.0). A star 7m? After a long and obstinate examination with
all powers and apertures, I cannot bring it to a sharp disc and leave it, in
doubt whether it be a star or not. The star B 137 immediately preceding
offered no such difficulty, giving a good disc with 320. [JH's italics:] No
doubt a "Stellar Nebula."'
I noted earlier, "JH's object is clearly a double star on the Southern Sky
Survey (was it closer together in JH's time?), and I put it in the SGC Notes
as such." However, on the DSS image, the two stars are not resolved. SIMBAD
has the separation as 1.2 arcsec at 191 degrees (measured in 1954), and has
another fainter star (component "C") at 47.5 arcsec and 81 degrees in 1913.
That fainter star is partially covered by the diffraction spike on the Schmidt
plate.
In any event, we now know why JH could not bring the star to a "sharp disk".