HR 4796A

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HR 4796 A / B

HR 4796
Observation data
Epoch J2000
Constellation
(pronunciation)		 Centaurus
Right ascension 12h 36m 01.0316s[1]
Declination −39° 52′ 10.219″[1]
Apparent magnitude (V) 5.783[1]
Characteristics
Spectral type A0V[1]
B-V color index +0.01[1]
Variable type None
Astrometry
Proper motion (μ) RA: -55.92[1] mas/yr
Dec.: −24.00[1] mas/yr
Parallax (π) 14.91 ± 0.75[1] mas
Distance 220 ± 10 ly
(67 ± 3 pc)
Details
Mass 2 M☉
Radius ? R☉
Luminosity 20 L☉
Temperature ? K
Metallicity ?
Rotation ?
Age 8 million years
Other designations
HD 109573, EXO 1233.3-3935, IDS 12307-3919 A, TWA 11, CCDM J12360-3952A, FAUST 3271, TYC 7762-1973-1, CD-39° 7717, GC 17164, 2MASS J12360103-3952102, CPC 18 5960, CPD-39° 5622, GSC 07762-01973, SAO 203621, CSI-39° 7717 21, HIC 61498, FC 41, 2E 2788, HIP 61498, TD1 16381, TWA 11A.[1]
Database references
SIMBAD data

HR 4796A is a young star in the Centaurus constellation, approximately 220 light years from Earth. It is twice as massive as the Sun and twenty times more luminous. It is thought to be approximately 8 million years old and is surrounded by a protoplanetary disk that was discovered in 1991. The dust in the disk appears to be the result of collisions between planetesimals.[2]

In 2007 observations using the Near-Infrared Multi-Object Spectrometer aboard the Hubble Space Telescope indicated that the dust had a reddish spectrum similar to that of tholins.[3]

[edit] Notes

HIC 61498 includes the components CCDM J12360-3952 A and CCDM J12360-3952 B ( 01-Jan-2000 ).

[edit] References

  1. ^ a b c d e f g h i HD 109573 -- Star in double system. SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved on 2007-01-08.
  2. ^ Anonymous (January 4, 2008). Suggestive Red Dust in Protoplanetary Disk. Centauri Dreams. Retrieved on 2008-01-08.
  3. ^ Debes, J.H.; A.J. Weinberger, G. Schneider. "Complex Organic Materials in the Circumstellar Disk of HR 4796A". arXiv:0712.3283. 
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