RX J0852.0-4622

From Wikipedia, the free encyclopedia

Observation data (Epoch J2000.0)
RX J0852.0-4622 or Vela Junior
Supernova type	SN
Remnant type	?
Constellation	Vela
Right ascension	08^h 52^m
Declination	-46° 22'
Galactic coordinates	286.9460 +42.4568 (34" W, 10" S)
Discovery Date
Peak magnitude (V)	?
Distance	700 Ly
Physical characteristics
Progenitor	?
Progenitor type	?
Colour (B-V)	?
Notable features	Could be associated with PSR J0855-4644. central object in SNR RX J0852.0-4622 = AX J0851.9-4617.

RX J0852.0-4622 (also known as G266.2−1.2) is a recently discovered supernova remnant. The distance to this object is controversial, but some scientists argue that the supernova remnant is only 650-700 light years away, and exploded comparatively recently, only about 1400 years ago. The remnant is located in the southern sky in the constellation Vela ("sail"), and sits (in projection) inside the much larger and older Vela Supernova Remnant. For this reason, RX J0852.0-4622 is often referred to as Vela Junior.

X-ray astronomers and gamma-ray astronomers of the Max Planck Institute for Extraterrestrial Physics in Garching, Germany, discovered this supernova remnant in 1998 (Nature, Vol. 396, 12 November 1998).

If the remnant is indeed young and nearby, its corresponding supernova should have been visible from the Earth in about the year 1250. One difficulty with this interpretation is that there are no contemporary written reports of any supernova at that time or in that part of the sky.