NGC-1555, Hind's Variable Nebula (Mark L Mitchell)

Celestial hemisphere: Northern · Constellation: Taurus (Tau) · Contains: HD27560 · Hind's Nebula · Hind's Variable Nebula · LBN 817 · NGC 1554 · NGC 1555 · Sh2-238 · Struve's Lost nebula · VdB28

NGC-1555, Hind's Variable Nebula

Revision title: NGC-1555, Hind's Variable Nebula

NGC-1555, Hind's Variable Nebula

Revision title: NGC-1555, Hind's Variable Nebula

From 5h 25m LRGB data.

This area has a lot going on. The central orange star is T Tauri (HD-284419) - the prototype for T Tauri variable stars described by Alfred Joy in 1945.
It is a young star that is not performing hydrogen fusion yet. It has a circumstellar disc that radiates strongly in the ultraviolet. The energy from the disk supplies bipolar jets (Herbig - Haro objects), and the radiation colliding with the surrounding molecular cloud makes the reflection nebula, NGC-1555 (Sh2-238). John Russell Hind discovered the nebula on October 11, 1852. Herbig-Haro objects are relatively short-lived, and NGC-1555 varies in brightness - in the 1860s it disappeared for a while. T Tauri is a triple star. Its two companions are optically invisible, but the major energy outflow is thought to come from T Tauri South, not T Tauri North seen in this image.

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Title: NGC-1555, Hind's Variable Nebula

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Status	Advanced success
Started	...
Astrometry.net job	8892722
PixInsight job	0LVSUEFKKMWNHRSA12C1VNZ2PBH2RF8O
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	04h22m04s.67
RA (top/left)	04h23m36s.20
RA (top/right)	04h19m41s.91
RA (bottom/right)	04h20m33s.86
RA (bottom/left)	04h24m26s.89

Dec (center)	+19°32′22″.2
Dec (top/left)	+20°02′29″.0
Dec (top/right)	+19°47′55″.1
Dec (bottom/right)	+19°02′10″.1
Dec (bottom/left)	+19°16′40″.8

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NGC-1555, Hind's Variable Nebula

Revision title: NGC-1555, Hind's Variable Nebula

NGC-1555, Hind's Variable Nebula

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NGC-1555, Hind's Variable Nebula

Revision title: NGC-1555, Hind's Variable Nebula

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