V1073 Scorpii

This article is about k Scorpii. Not to be confused with κ (kappa) Scorpii.
V1073 Scorpii
Location of V1073 Scorpii (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Scorpius
Right ascension 17h 04m 49.35254s[1]
Declination −34° 07′ 22.5483″[1]
Apparent magnitude (V) +4.87[2]
Characteristics
Spectral type B0.7 Ia[3]
U−B color index −0.69[2]
B−V color index +0.26[2]
Variable type α Cyg[4]
Astrometry
Radial velocity (Rv)7.00[5] km/s
Proper motion (μ) RA: +0.600[1] mas/yr
Dec.: −2.015[1] mas/yr
Parallax (π)1.1161 ± 0.2097 mas[1]
Distanceapprox. 2,900 ly
(approx. 900 pc)
Absolute magnitude (MV)−6.8[6]
Details
Mass28[7]
19.7±1.0[8]
27.11±8.39[9] M☉
Radius36.0[6][3] R☉
Luminosity302,000[6] L☉
Surface gravity (log g)2.70[7]
2.65[3] cgs
Temperature20,800[9]
22,500[3] K
Rotational velocity (v sin i)47[7] km/s
Age4.2±0.3[8] Myr
Other designations
k Sco, V1073 Sco, CD−33°11706, HD 154090, HIP 83574, HR 6334, SAO 208377[10]
Database references
SIMBADdata

V1073 Scorpii is a variable star in the constellation Scorpius. It has a non-Greek Bayer designation of k Scorpii. The star has a blue-white hue and is visible to the naked eye with an apparent visual magnitude that fluctuates around +4.87.[2] Parallax measurements yield a distance estimate of approximately 2,920 ly (896 pc) from the Sun, and it is drifting further away with a radial velocity of +7 km/s.[5] It has an absolute magnitude of −6.8[6]

A light curve for V1073 Scorpii, adapted from Lefèvre et al. (2009)[11]

This object is a massive supergiant star with a stellar classification of B0.7 Ia.[3] It is an α Cygni variable;[12] a supergiant that pulsates erratically on a timescale of days to weeks with an amplitude of less than a tenth of a magnitude. A simplistic fitting of Hipparcos data suggests a periodicity of 1.6 days.[13][11] The star is around 4.2[8] million years old and is a member of the Upper Scorpius subgroup of the Sco OB2 association.[14] V1073 Scorpii is considered a "runaway" star, showing a peculiar velocity of more than 37 km/s relative to its neighbourhood.[8] No bow shock has been detected from its motion through interstellar space.[15]

V1073 Sco has a 14th magnitude visual companion,[16] which is an unrelated background object according to its Gaia Data Release 2 parallax.[17]

  1. ^ a b c d e Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference ducati2002 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference kraus_et_al_2009 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Kharchenko_et_al_2007 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference crowther_et_al_2006 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference fraser_et_al_2010 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference tetzlaff_et_al_2011 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Hohle_et_al_2010 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference lefevre_et_al_2009 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Kazarovets_et_al_1999 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference koen_eyer_2002 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Brown_Verschueren_1997 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Peri_et_al_2012 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference mason_et_al_2001 was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference dr2b was invoked but never defined (see the help page).