Lambda1 Sculptoris

For other star systems with this Bayer designation, see λ Sculptoris.
Lambda1 Sculptoris
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Sculptor
Right ascension 00h 42m 42.89190s[1]
Declination −38° 27′ 48.5416″[1]
Apparent magnitude (V) +6.05[2] (6.612 + 7.041)[3]
Characteristics
Spectral type B9.5 V[4] + A9(V)[5]
U−B color index −0.13[2]
B−V color index −0.03[2]
Astrometry
Radial velocity (Rv)11.1±0.6[6] km/s
Proper motion (μ) RA: +2.56[1] mas/yr
Dec.: −6.72[1] mas/yr
Parallax (π)6.89 ± 0.71 mas[1]
Distanceapprox. 470 ly
(approx. 150 pc)
Absolute magnitude (MV)+0.27[7]
Details
λ1 Scl A
Mass2.83±0.13[8] M☉
Luminosity94[8] L☉
Temperature10,351[8] K
Rotational velocity (v sin i)35[8] km/s
Other designations
λ1 Scl, CD−39° 175, HD 4065, HIP 3356, HR 185, SAO 192690, WDS J00427-3828AB[9]
Database references
SIMBADdata

Lambda1 Sculptoris, Latinised from λ1 Sculptoris, is a double star system in the southern constellation of Sculptor. It is close to the lower limit of visibility to the naked eye, with a combined apparent visual magnitude of +6.05.[2] Based upon an annual parallax shift of 6.89 mas as measured from Earth,[1] it is located roughly 470 light-years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.026 due to interstellar dust.[10]

The brighter star, component A, has a visual magnitude of 6.6, while the secondary, component B, is magnitude 7.0.[3] As of 2000, the pair had an angular separation of 0.737 arcsecond along a position angle of 14.0°.[3] Component A is a blue-white-hued B-type main-sequence star with a stellar classification of B9.5 V.[4] It has 2.8 times the mass of the Sun and radiates 94 times the solar luminosity from its photosphere at an effective temperature of 10,351 K.[8] The mass ratio is 0.609, meaning the secondary is only 60.9% as massive as the primary.[11]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Westerlund1963 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Fabricius2000 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference houk1979 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference beavers was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b c d e Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Paunzen2006 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Makarov was invoked but never defined (see the help page).