NGC/IC Project Restoration Effort

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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

===== 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".