NGC1999, IC430 & Herbig-Haro object

Deep Sky Object in Winter

NGC1999, IC430 & Herbig-Haro object (Reflection Nebulae in Orion)

Click on image to enlarge

Date & Time:	Dec 9 2023, from 25:17 to 27:16 JST(+0900)
	Mosaic of 2 flames of 10min.×6shots
Optical:	VIXEN 20cm(7.9") VISAC with conversion lens (f=1278mm, F6.4)
	with LPS-D1 Light-pollution suppression filter
	Auto-guided with TAKAHASHI JP Equatorial & SBIG STV
CMOS Camera:	ZWO ASI2600MC Pro (Cooled temp.: -25°C)
Location:	Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings:	Recording format...16bit FITS, converted to 16bit TIFF(6248×4176)
	Device Size...23.5×15.7mm, Gain...100

NGC1999 / Reflection Nebula, type 1 E
R.A.	05h 36m 30.0s (2000.0)
Dec.	-06° 42' 00" (2000.0)
Apparent Size	about 1'
Real Size	0.9 light yrs.
Magnitude	10.0
Distance	1500 light yrs.
Other IDs	IC427-428, LBN979

IC430 / Reflection Nebula, type R
R.A.	05h 38m 40.0s (2000.0)
Dec.	-07°09' 00" (2000.0)
Apparent Size	15.5×6.2'
Real Size	6.3×2.5 light yrs.
Magnitude	-
Distance	1400 light yrs.
Other IDs	IC429

A small reflection nebula only 1degree SSE of the Great Orion Nebula(M42) is named NGC1999. The nebula has an apparent diameter of only 1 arc minute.
This object looks like a compact ring because a lump of dark nebulosity is obstructing a white gas in background. A newborn star of V380 with a magnitude of 10.5 is shining in eastern region of the nebula and NGC1999 is glittering by the star. In January 2000, the Hubble Space Telescope (HST) took a splendid shot of NGC1999, the shot made this faint object popular overnight. The nebula is lying about 1500 light years away, just in the Orion Association.
And there are very dimmed reddish nebulosities about 2 arc minutes south of NGC1999. The region contains a cluster of deeply embedded young stars which power oppositely directed bow shocks. These objects were first recognized by Guillermo Haro and George Herbig around 1950 and today they are known as HH 1 and HH 2. This type of active objects are known as Herbig-Haro (HH) objects, which move through the surrounding gas at speeds of up to hundreds of kilometers per second (over 100,000 miles an hour). Now several hundreds of HH objects distributed in heavens are registered in HH catalogue.
The brilliant star visible approximately 50 minutes southeast of NGC 1999 is 49 Orionis with a brightness of 5th magnitude. The triangular-shaped nebula seen just to the northwest (upper right) of this star is IC 430. At the northwest tip of this nebula, the presence of a protostar known as V883 Orionis has been revealed, with an estimated age of only about 500,000 years.

Magnified image around NGC1999

A pair of gaseous region just south of NGC1999 is HH1 & HH2.

Magnified image around IC430

V883 locates at tip of IC430 stretched NW of 49 Orionis.

NGC1973

NGC2022

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