HD 98800

Artist's impression of HD 98800 , NASA/JPL-Caltech/T. Pyle (SSC)

HD 98800
Observation data
Epoch J2000
Constellation
(pronunciation)		 Crater
Right ascension 11h 22m 05.2898s
Declination -24° 46' 39.760 "'
Apparent magnitude (V) 9.11
Characteristics
Spectral type K5Ve
U-B color index ?
B-V color index ?
Variable type None
Astrometry
Radial velocity (Rv) 9.25 km/s
Proper motion (μ) RA: -85.45 mas/yr
Dec.: -33.37 mas/yr
Parallax (π) 21.43 ± 2.86 mas
Distance approx. 150 ly
(approx. 47 pc)
Absolute magnitude (MV) 10.27
Details
Mass ? M☉
Radius ? R☉
Luminosity ? L☉
Temperature ? K
Metallicity ?
Rotation ?
Age 10 million years
Visual binary orbit
Companion HD 98800 A 1/2
Period (P) 0 yr
Semimajor axis (a) 50 AU"
Eccentricity (e) 0
Inclination (i) 0°
Longitude of the node (Ω) 0°
Periastron epoch (T) 0
Visual binary orbit
Companion HD 98800 B 1/2
Period (P) 0 yr
Semimajor axis (a) 50 AU"
Eccentricity (e) 0
Inclination (i) 0°
Longitude of the node (Ω) 0°
Periastron epoch (T) 0
Visual binary orbit
Companion HD 98800 AB
Period (P) 0 yr
Semimajor axis (a) 50 AU"
Eccentricity (e) 0
Inclination (i) 0°
Longitude of the node (Ω) 0°
Periastron epoch (T) 0
Other designations
V* TV Crt, GLMP 294, MCBB 3-84, TWA 4A, ** I 507,

GSC 06654-00219, ADS 8141 A, HD 98800A, RBS 975,

UGP 267, CD-24 9706, HIC 55505, HIP 55505,

SAO 179815, GJ 2084 A, TWA 4.
Database references
SIMBAD data

HD 98800 is a quadruple star system located in the TW Hydrae association. The system consists of four T Tauri stars orbiting as a pair of stellar binaries, designated HD 98800A and HD 98800B and separated by 50 AU. HD 98800B is circled by debris ring extending to 5.9 AU from the barycenter of the system and which is consistent with models of planet formation, having an age of about 10 million years. Observations by the Spitzer Space Telescope indicate that HD 98800B may have a planet orbiting it as well at a distance of 1.5 to 2 AU.

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