HR 8323

HR 8323

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Grus
Right ascension	21h 48m 15.7514s[1]
Declination	−47° 18′ 13.014″[1]
Apparent magnitude (V)	5.58[1]
Characteristics
Spectral type	G2V[1]
U−B color index	+0.08[2]
B−V color index	+0.60[2]
Astrometry
Radial velocity (Rv)	−7.6 ± 0.2[1] km/s
Proper motion (μ)	RA: 165.64[1] mas/yr Dec.: −295.00[1] mas/yr
Parallax (π)	63.95 ± 0.78[1] mas
Distance	51 ± 0.6 ly (15.6 ± 0.2 pc)
Absolute magnitude (MV)	4.61[3]
Details
Mass	0.97 (0.92 to 1.04)[4] M☉
Radius	1.0[5] R☉
Temperature	5900[4] K
Metallicity	[Fe/H] = −0.15[4]
Rotational velocity (v sin i)	2[4] km/s
Age	3.8 (1.3 to 7.4) × 109[4] years
Other designations
CCDM J21483-4718A, CD−47 13928, CPD−47 9758, FK5 1573, GC 30516, Gliese 838, GJ 838, HD 207129, HIP 107649, IDS 21418-4746 A, LTT 8704, NLTT 52100, PPM 327579, SAO 230846, WDS J21483-4718A.[1]
Database references
SIMBAD	data

HR 8323 is a G-type pre-main-sequence star in the constellation of Grus.^[1] It has an apparent visual magnitude of approximately 5.58.^[1] A debris disk has been imaged around this star in visible light using the ACS instrument on the Hubble Space Telescope; it has also been imaged in the infrared (70 μm) using the MIPS instrument on the Spitzer Space Telescope. Based on the ACS image, the disk appears to have a radius of about 163 astronomical units and to be about 30 AU wide, and to be inclined at 60° to the plane of the sky.^[6]

Another star, CCDM J21483-4718B (also designated CD−47 13929 or WDS J21483-4718B), of apparent visual magnitude 8.7, has been observed 55 arcseconds away from this star,^[7] but based on comparison of proper motions, it is believed to be an optical double and not physically related to its companion.^[8]

References

1. ^ ^{a b c d e f g h i j k} HD 207129 -- Pre-main sequence Star, database entry, SIMBAD. Accessed on line February 9, 2011.
2. ^ ^{a b} HR 8323, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line February 9, 2011.
3. ^ From apparent magnitude and parallax.
4. ^ ^{a b c d e} HD 207129, database entry, The Geneva-Copenhagen Survey of Solar neighbourhood, J. Holmberg et al., 2007, CDS ID V/117A. Accessed on line February 9, 2011.
5. ^ HD 207129, database entry, Catalog of Apparent Diameters and Absolute Radii of Stars (CADARS), 3rd edition, L. E. Pasinetti-Fracassini, L. Pastori, S. Covino, and A. Pozzi, CDS ID II/224. Accessed on line February 9, 2011.
6. ^ HST and Spitzer Observations of the HD 207129 Debris Ring, John E. Krist et al., The Astronomical Journal 140, #4 (October 2010), pp. 1051-1061, doi:10.1088/0004-6256/140/4/1051, Bibcode: 2010AJ....140.1051K.
7. ^ CCDM J21483-4718, database entry, CCDM (Catalog of Components of Double & Multiple stars), J. Dommanget and O. Nys, second edition, 2002, VizieR database I/274.
8. ^ Notes, WDS 21483-4718, The Washington Double Star Catalog, B. D. Mason et al., version 2011-02-06, VizieR database B/wds.