HD 92945

From Wikipedia, the free encyclopedia
Jump to: navigation, search
HD 92945
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Hydra
Right ascension 10h 43m 28.2717s[1]
Declination −29° 03′ 51.421″[1]
Apparent magnitude (V) 7.76[1]
Characteristics
Spectral type K1V[1]
B−V color index 0.9[1]
Variable type BY[2]
Astrometry
Radial velocity (Rv) 22.6 ± 0.3[1] km/s
Proper motion (μ) RA: −215.39[1] mas/yr
Dec.: −48.50[1] mas/yr
Parallax (π) 46.36 ± 0.84[1] mas
Distance 70 ± 1 ly
(21.6 ± 0.4 pc)
Absolute magnitude (MV) 6.09[3]
Details
Mass 0.80 (0.77 to 0.85)[4] M
Radius 0.77[5] R
Luminosity 0.38[5] L
Temperature 5000[4] K
Metallicity [Fe/H] −0.17[4] dex
Rotational velocity (v sin i) 4[4] km/s
Age 294 ± 23[5] Myr
Other designations
V419 Hydrae, V419 Hya, CD−28 8394, CPD−28 4175, GJ 3615, HIP 52462, LTT 3932, NLTT 25167, PPM 258065, SAO 179168.[1]
Database references
SIMBAD data

HD 92945 is a K-type main sequence star in the constellation of Hydra.[1] Its apparent visual magnitude varies by 0.02 magnitudes and is approximately 7.72 at maximum brightness.[2] A debris disk has been observed around the star by coronagraphic imaging, using the ACS and NICMOS instruments on the Hubble Space Telescope. It appears to extend 45 to 175 astronomical units from HD 92945 and is inclined at approximately 29 degrees.[6]

References[edit]

  1. ^ a b c d e f g h i j k V* V419 Hya -- Variable of BY Dra type, database entry, SIMBAD. Accessed on line February 2, 2011.
  2. ^ a b V419 Hya, database entry, The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line February 2, 2011.
  3. ^ From apparent magnitude and parallax.
  4. ^ a b c d HD 92945, database entry, The Geneva-Copenhagen Survey of Solar neighbourhood, J. Holmberg et al., 2007, CDS ID V/117A. Accessed on line February 2, 2011.
  5. ^ a b c Plavchan, Peter et al. (June 2009), "New Debris Disks Around Young, Low-Mass Stars Discovered with the Spitzer Space Telescope", The Astrophysical Journal 698 (2): 1068–1094, arXiv:0904.0819, Bibcode:2009ApJ...698.1068P, doi:10.1088/0004-637X/698/2/1068 
  6. ^ Observations and Models of the Debris Disk around the K dwarf HD 92945, D. Golimowski et al., Proceedings of the conference In the Spirit of Bernard Lyot: The Direct Detection of Planets and Circumstellar Disks in the 21st Century, Paul Kalas, ed., June 4–8, 2007, University of California, Berkeley, Bibcode2007lyot.confE..46G.