HD 158633

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HD 158633
Observation data
Epoch J2000      Equinox J2000
Constellation Draco
Right ascension 17h 25m 00.0985s[1]
Declination +67° 18′ 24.137″[1]
Apparent magnitude (V) 6.43[2]
Spectral type K0 V[2]
U−B color index +0.29[3]
B−V color index +0.76[3]
Radial velocity (Rv) −40[4] km/s
Proper motion (μ) RA: −531.03[1] mas/yr
Dec.: 3.62[1] mas/yr
Parallax (π) 78.14 ± 0.51[1] mas
Distance 41.7 ± 0.3 ly
(12.80 ± 0.08 pc)
Absolute magnitude (MV) 5.89[5]
Mass 0.729[6] M
Radius 0.7891±0.0144[6] R
Luminosity 0.4090±0.0040[6] L
Surface gravity (log g) 4.80[7] cgs
Temperature 5203±46[6] K
Metallicity −0.43 ± 0.08[8]
Age 4.27[8] Gyr
Other designations
GJ 675, HR 6518, BD +67°1014, HD 158633, LHS 287, LTT 15185, GCTP 3972.00, SAO 17474, HIP 85235.[2]
Database references

HD 158633 is a main sequence star in the northern constellation Draco. With an apparent visual magnitude of 6.43, this star is too faint to be observed with the unaided eye but it can be seen with a small telescope. Based upon parallax measurements made by the Hipparcos spacecraft, it is located around 42 light years from the Sun.

This is a K-type main sequence star with a spectral classification of K0 V. It has about 79% of the Sun's radius and 73% of the solar mass.[6] The star is emitting an excess of infrared radiation at a wavelength of 70 μm.[8] It has a low metallicity, with only 37% of the Sun's abundance of elements more massive than helium, and has a relatively high proper motion.[2]


  1. ^ a b c d e Perryman, M. A. C.; et al. (1997), "The Hipparcos Catalogue", Astronomy & Astrophysics, 323: L49–L52, Bibcode:1997A&A...323L..49P 
  2. ^ a b c d "LHS 3287". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2009-04-14. 
  3. ^ a b Hauck, B.; Mermilliod, M. (1998). "uvbyβ photoelectric photometric catalogue". Astronomy and Astrophysics Supplement Series. 129: 431–433. Bibcode:1998A&AS..129..431H. doi:10.1051/aas:1998195. 
  4. ^ Wilson, Ralph Elmer (1953). General catalogue of stellar radial velocities. Washington, DC: Carnegie Institution of Washington. Bibcode:1953GCRV..C......0W. 
  5. ^ Kovtyukh, V. V.; Soubiran, C.; Belik, S. I. (2004). "A new Böhm-Vitense gap in the temperature range 5560 to 5610 K in the main sequence". Astronomy and Astrophysics. 427: 933–936. Bibcode:2004A&A...427..933K. arXiv:astro-ph/0409753Freely accessible. doi:10.1051/0004-6361:20041449. 
  6. ^ a b c d e Boyajian, Tabetha S.; et al. (July 2013), "Stellar Diameters and Temperatures. III. Main-sequence A, F, G, and K Stars: Additional High-precision Measurements and Empirical Relations", The Astrophysical Journal, 771 (1): 31, Bibcode:2013ApJ...771...40B, arXiv:1306.2974Freely accessible, doi:10.1088/0004-637X/771/1/40, 40.  See Table 3.
  7. ^ Luck, R. Earle; Heiter, Ulrike (2006). "Dwarfs in the Local Region". The Astronomical Journal. 131: 3069–3092. Bibcode:2006AJ....131.3069L. doi:10.1086/504080. 
  8. ^ a b c Beichman, C. A.; et al. (2006). "New Debris Disks Around Nearby Main-Sequence Stars: Impact on the Direct Detection of Planets". The Astrophysical Journal. 652 (2): 1674–1693. Bibcode:2006ApJ...652.1674B. arXiv:astro-ph/0611682Freely accessible. doi:10.1086/508449.