NGC/IC Project Restoration Effort

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NGC1555

 

Basic Information


Location and Magnitude


Right Ascension: 4:21:56.7
Declination: +19:32:4
Constellation: TAU
Visual Magnitude:

Historic Information


Discoverer: Hind
Year of discovery: 1852
Discovery aperture: 7.0

Observational


Summary description: !!! vF, S, variable (Auw 20)
Sub-type: RN

Steve's Notes

===== NGC 1555 24" (1/12/13): at 200x unfiltered, Hind's Variable Nebula was immediately seen as a very faint, fairly small, elongated haze, roughly 40" in length and slightly curved or bowed out to the west. The variable reflection nebula seemed unevenly lit, though it was too faint to see any specific details. This famous nebula is illuminated by T Tauri (mag 10-10.5), just 35" to the east. T Tauri is perfectly collinear with mag 8.4 HD 27560 5.6' SW and a mag 12 star 4.7' SW. The nebula has likely brightened since the view in 1996 with my 17.5". 17.5" (11/10/96): this is Hind's Variable (reflection) Nebula, illuminated by T Tauri (9-13). At 100x and 140x (unfiltered) an extremely faint haze was highly suspected on the west or west-southwest side of T Tauri (mag 9) in the direction of a mag 14 star to the west or slightly south (this star is at the position of NGC 1554 = "Struve's Lost Nebula"). No details in the nebula were visible at 100x (it did not appear as an arc) but a sketch made at 100x exactly matched the orientation of the nebulosity with respect to T Tauri. Nebulosity was not visible at 220x and no nebulosity was noted following T Tauri. Hind's Variable Nebula was discovered (along with T Tauri) by John Russell Hind on 11 Oct 1852 with a 7-inch refractor. Because of it's variability, disappearance in the early 1860's, and eventual recovery by Barnard in 1890, it was a subject of fascination and numerous journal reports by most of the major great visual observers of the time including d'Arrest, Tempel, Charconac, Auwers, Secchi, Lassell, Struve, Winnecke, Lawrence Parsons, Dreyer, Barnard and Burnham.