Sigma Sculptoris

Sigma Sculptoris

An ultraviolet light curve for Sigma Sculptoris, adapted from Manfroid and Renson (1994)[1]
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Sculptor
Right ascension 01h 02m 26.43280s[2]
Declination −31° 33′ 07.2237″[2]
Apparent magnitude (V) +5.54[3]
Characteristics
Spectral type A2V[4]
U−B color index +0.13[3]
B−V color index +0.06[3]
Astrometry
Radial velocity (Rv)−15.40±0.50[5] km/s
Proper motion (μ) RA: +80.50[2] mas/yr
Dec.: +14.64[2] mas/yr
Parallax (π)14.04 ± 0.32 mas[2]
Distance232 ± 5 ly
(71 ± 2 pc)
Absolute magnitude (MV)+1.24[6]
Details[4]
A
Mass1.95 M☉
Radius2.0 R☉
Luminosity25.7[7] L☉
Surface gravity (log g)4.02±0.14[8] cgs
Temperature8,470 K
Rotational velocity (v sin i)82.1±1.2[9] km/s
Age560 Myr
B
Mass0.72 M☉
Radius0.67 R☉
Temperature4,530 K
Other designations
σ Scl,  Sculptoris, CD−32° 410, HD 6178, HIP 4852, HR 293, SAO 192884[10]
Database references
SIMBADdata

Sigma Sculptoris, Latinized from σ Sculptoris, is a binary star in the southern constellation of Sculptor. It is faintly visible to the naked eye with an apparent visual magnitude of +5.54.[3] Based upon an annual parallax shift of 14.04 mas as seen from Earth,[2] it is located about 232 light years from the Sun.

The main component is an main sequence A-type star with a stellar classification of A1/A2 IV.[11] It was suspected to be an Ap star and an Alpha2 Canum Venaticorum variable,[12] but no chemical peculiarity or variability was found in 2018.[4] The star has an estimated 1.95 the mass of the Sun and around two times the Sun's radius.[4] It is spinning with a projected rotational velocity of 82 km/s[9] and is about 560 million years old.[4] Sigma Sculptoris radiates 25.7[7] times the solar luminosity from its photosphere at an effective temperature of 8,470 K.[4]

The secondary is a small star with 72% the mass of the Sun, 5.7 times fainter than the primary.[4]

  1. ^ Cite error: The named reference Manfroid was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Westerlund1963 was invoked but never defined (see the help page).
  4. ^ a b c d e f g Cite error: The named reference waisberg was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference David2015 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Diaz2011 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. ^ Cite error: The named reference houk1979 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference gcvs was invoked but never defined (see the help page).