HD 161056

HD 161056
Location of HD 161056 (circled)
Observation data
Epoch J2000.0[1]      Equinox J2000.0[1]
Constellation Ophiuchus
Right ascension 17h 43m 47.02216s
Declination −07° 04′ 46.5943″
Apparent magnitude (V) 6.32[2]
Characteristics
Spectral type B1.5V, B3II/III, or B3Vn[3]
U−B color index −0.42[2]
B−V color index 0.36[2]
J−H color index 0.072[4]
J−K color index 0.101[4]
Astrometry
Radial velocity (Rv)−26.0±4.3[5] km/s
Proper motion (μ) RA: -4.629[1] mas/yr
Dec.: −10.512[1] mas/yr
Parallax (π)2.4404 ± 0.0432 mas[1]
Distance1,340 ± 20 ly
(410 ± 7 pc)
Other designations
BD−07° 4487, Gaia DR3 4168881422863453568, GC 24051, HIP 86768, HR 6601, SAO 141832, PPM 200979, TIC 296910097, TYC 5093-438-1, 2MASS J17434702-0704465[4]
Database references
SIMBADdata

HD 161056 (HIP 86768, HR 6601) is a bluish-white hued star in the equatorial constellation of Ophiuchus. It has an apparent magnitude of 6.32, placing it near the limit for naked eye visibility under dark skies. The object is located approximately 1,340 light-years (410 parsecs) distant according to Gaia EDR3 parallax measurements,[1] but it is moving closer at a heliocentric radial velocity of −26.0 km/s.

It is a luminous early B-type star, but its spectral type varies from publication to publication, most often between B1.5V,[6] implying a hot main-sequence star, and B3II/III,[7] indicative of a slightly cooler blue giant.

In Chinese astronomy, the star was given the name Shìlóuliù (Chinese: 市樓六), meaning it was the sixth star of the asterism Shìlóu (市樓, "Municipal Office") in the Heavenly Market enclosure.[8]

  1. ^ a b c d e Cite error: The named reference EDR3 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Ducati2002 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Pantaleoni2021 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference simbad was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Bastien2007 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Wiktorowicz2023 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Yi1981 was invoked but never defined (see the help page).