39 Draconis

Source: Wikipedia, the free encyclopedia.
This article is about b Draconis. It is not to be confused with β (beta) Draconis.
39 Draconis
Observation data
J2000
Constellation Draco
Right ascension 18h 23m 54.60641s[1]
Declination +58° 48′ 02.6446″[1]
Apparent magnitude (V) 5.034[2]
(5.06 + 8.07)[3]
Characteristics
Spectral type A1V + F5V[4]
U−B color index +0.06[5]
B−V color index +0.10[5]
Distance
184 ± 4 ly
(56 ± 1 pc)
Absolute magnitude (MV)1.31 / 4.32[7]
Argument of periastron
(ω)
(secondary)		128.0 ± 2.18°
Details
39 Dra A
Mass2.12[7] M☉
Radius2.3[8] R☉
Surface gravity (log g)4.05 ± 0.07[8] cgs
Temperature8710[8] K
39 Dra B
Mass1.18[7] M☉
HR 6923, SAO 30949[2]
Database references
SIMBAD39 Dra
39 Dra A
39 Dra B

39 Draconis is a wide

apparent visual magnitude of 5.0.[2] Parallax measurements made by the Hipparcos spacecraft put it at a distance of 184 light-years, or 56 parsecs away from the Sun.[1] The system is moving closer to the Earth with a heliocentric radial velocity of -24.5 km/s.[6]

The two components of 39 Draconis have an

mass of the Sun with a visual magnitude of 5.06[3] The secondary is a magnitude 8.07[3] F-type main-sequence star, and has 1.18 times the mass of the Sun.[7]

The 8th-magnitude star HD 238865 is listed in double star catalogues as component C.

spectroscopic binary with an F8 primary and a red dwarf secondary orbiting every 2.7 days.[11][12]

References

  1. ^
    S2CID 18759600
    .
  2. ^ a b c "* b Dra". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 21 June 2017.
  3. ^ a b c d e "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 2017-08-01. Retrieved 2017-06-22.
  4. doi:10.1086/112066
    .
  5. ^
    Bibcode:1986EgUBV........0M
    .
  6. ^
    S2CID 119387088
    .
  7. ^
    doi:10.2298/SAJ0672021N
    .
  8. ^
    Bibcode:1999A&A...352..555A
    .
  9. doi:10.1086/323920
    .
  10. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  11. S2CID 88503488
    .
  12. Bibcode:1995AstL...21..247T
    .


Retrieved from "https://en.wikipedia.org/w/index.php?title=39_Draconis&oldid=1195389437"