R Sculptoris

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R Sculptoris
Sculptor constellation map.svg
Red circle.svg

Location of R Sculptoris (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sculptor
Right ascension 01h 26m 58.09492s[1]
Declination −32° 32′ 35.4374″[1]
Apparent magnitude (V) +5.72[2] (5.5 - 9.5[citation needed])
Spectral type C6,5ea(Np)[3]
U−B color index +7.67[2]
B−V color index +3.87[2]
Variable type SRb[4]
Radial velocity (Rv) −5.40[5] km/s
Proper motion (μ) RA: −7.63 ± 0.69[1] mas/yr
Dec.: −31.48 ± 0.46[1] mas/yr
Parallax (π) 3.76 ± 0.75[1] mas
Distance approx. 900 ly
(approx. 270 pc)
Mass 2 - 3[3] M
Radius 513[3] R
Luminosity 11,000[3] L
Surface gravity (log g) −0.59[3] cgs
Temperature 2,600[3] K
Other designations
R Scl, HD 8879, HR 423, HIP 6759, AAVSO 0122-33
Database references

R Sculptoris is an asymptotic giant branch semi-regular variable red giant star located 1,500 light-years (460 parsecs) away in the constellation of Sculptor.[6][7] Observations have revealed a spiral structure in the material around it.[8] The spiral is suspected to be caused by an unseen companion star.[6]



  1. ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. Bibcode:2007A&A...474..653V. arXiv:0708.1752Freely accessible. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. ^ a b c Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237: 0. Bibcode:2002yCat.2237....0D. 
  3. ^ a b c d e f Cruzalèbes, P.; Jorissen, A.; Rabbia, Y.; Sacuto, S.; Chiavassa, A.; Pasquato, E.; Plez, B.; Eriksson, K.; Spang, A.; Chesneau, O. (2013). "Fundamental parameters of 16 late-type stars derived from their angular diameter measured with VLTI/AMBER". Monthly Notices of the Royal Astronomical Society. 434: 437. Bibcode:2013MNRAS.434..437C. arXiv:1306.3288Freely accessible. doi:10.1093/mnras/stt1037. 
  4. ^ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S. 
  5. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  6. ^ a b "Hubble Gazes at R Sculptoris and its Hidden Companion". SpaceDaily. 11 January 2015. 
  7. ^ "Curious spiral spotted by ALMA around red giant star R Sculptoris (data visualisation)". Image Archive. ESO. Retrieved 11 October 2012. 
  8. ^ "Unexpectedly large mass loss during the thermal pulse cycle of the red giant R Sculptoris" (PDF). Research Paper. Retrieved 11 October 2012.