Xi Draconis

Xi Draconis

ξ Draconis in optical light
Observation data
Epoch J2000      Equinox J2000
Constellation Draco
Right ascension 17h 53m 31.72962s[1]
Declination +56° 52′ 21.5143″[1]
Apparent magnitude (V) 3.75[2]
Characteristics
Spectral type K2 III[3]
U−B color index +1.21[2]
B−V color index +1.18[2]
Astrometry
Radial velocity (Rv)−26.38 ± 0.20[4] km/s
Proper motion (μ) RA: 93.82 ± 0.14[1] mas/yr
Dec.: 78.50 ± 0.12[1] mas/yr
Parallax (π)28.98 ± 0.12 mas[1]
Distance112.5 ± 0.5 ly
(34.5 ± 0.1 pc)
Absolute magnitude (MV)+1.06[5]
Details
Mass1.45 ± 0.17[6] M☉
Radius12[7] R☉
Luminosity49 ± 4[6] L☉
Surface gravity (log g)2.3[7] cgs
Temperature4,445[6] K
Metallicity [Fe/H]−0.09[7] dex
Rotational velocity (v sin i)2.3[7] km/s
Other designations
32 Dra, BD+56 2033, FK5 671, HD 163588, HIP 87585, HR 6688, SAO 30631, WDS 17535+5652.
Database references
SIMBADdata

Xi Draconis (ξ Draconis, abbreviated Xi Dra, ξ Dra) is a double or binary star in the northern circumpolar constellation of Draco. It has an apparent visual magnitude of 3.75.[2] Based upon parallax measurements, it is located at a distance of 112.5 light-years (34.5 parsecs) from the Sun.[1] At this distance, the apparent magnitude is diminished by 0.03 from extinction caused by intervening gas and dust.[4]

The two components are designated Xi Draconis A (officially named Grumium /ˈɡruːmiəm/, a traditional name for the system)[8][9] and B.

  1. ^ a b c d e f Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference mnras172_667 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference araa11_29 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference aaa430_165 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Cardini2005 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference apjl674_1_L53 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference aj135_1_209 was invoked but never defined (see the help page).
  8. ^ Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
  9. ^ "Naming Stars". IAU.org. Retrieved 16 December 2017.