Deep Sky Object in Winter
Red Rectangle (Planetary Nebula in Monoceros)


Date & Time: Feb 23 2020, from 20:58 to 22:05 JST(+0900)
Composed 4 min.×15shots & 1min.×5shots
Optical: Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3)
with BaaderPlanetarium Moon&Skyglow filter
Auto-guided with Meade LX200 Equatorial & Lacerta M-GEN
Digital Camera: Nikon D810A
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...14bit CCD-RAW, converted to 16bit TIFF(2040×2040)
Device Size...10×10mm
Sensitivity...ISO4000, White Balance...Daylight


Red Rectangle / Emission Nebula, type R bipolar
R.A.06h 19m 58.1s (2000.0)
Dec.-10° 38' 14" (2000.0)
Apparent Size4.0×3.0"
Real SizeN/A
Magnitude -
Distance2300 light yrs.
Other IDs -
This image has captured a tiny celestial object near a boundary between Monoceros and Canis Major. This object has been classified as an emission nebula with a size of only 4 arc seconds, but it's considered that the nebula is a "Proto-Planetary Nebula" just started to release gaseous matters from a dead star. It was discovered in 1973 so registered in no any object catalogues. We have a nickname of "Red Rectangle" from its shape and unique color, became comparatively popular object after the Hubble Space Telescope (HST) captured its detailed and marvelous image.



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Around Taurus Molecular Cloud

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