Mu1 Cancri

Mu1 Cancri, Latinized from μ1 Cancri, is an evolved red giant star in the zodiac constellation of Cancer. Parallax measurements made by the Hipparcos spacecraft put it about 740 light years (230 parsecs) from the Sun.[1] At that distance, the visual magnitude is diminished by an extinction factor of 0.28.[8] The name Mu1 comes from the Bayer naming system: the "1" in the name is because (from Earth) it appears to be close to 10 Cancri (Mu2 Cancri). Mu1 Cancri is a variable star and was given the variable star designation BL Cancri. It is a slow irregular variable[3] with periods of 22.6, 37.8, and 203.7 days.[9]

For other stars with this Bayer designation, see μ Cancri.
Mu1 Cancri
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cancer
Right ascension 08h 06m 18.39576s[1]
Declination +22° 38′ 07.7621″[1]
Apparent magnitude (V) +5.99[2]
Characteristics
Spectral type M3 III[3]
B−V color index +1.66[2]
Variable type Lb[3]
Astrometry
Radial velocity (Rv)+29.61±0.57[4] km/s
Proper motion (μ) RA: −5.97[1] mas/yr
Dec.: −9.06[1] mas/yr
Parallax (π)4.38 ± 0.53[1] mas
Distanceapprox. 740 ly
(approx. 230 pc)
Absolute magnitude (MV)−0.79[5]
Details
Luminosity1,141[6] L☉
Temperature3,611[6] K
Other designations
μ1 Cnc, 9 Cancri, BL Cancri, BD+23° 1887, HD 66875, HIP 39659, HR 3169, SAO 79940[7]
Database references
SIMBADdata

References
  1. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  2. 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, Bibcode:2002yCat.2237....0D.
  3. Lebzelter, T.; Hron, J. (December 2003), "Technetium and the third dredge up in AGB stars. I. Field stars", Astronomy and Astrophysics, 411 (3): 5335–42, arXiv:astro-ph/0310018, Bibcode:2003A&A...411..533L, doi:10.1051/0004-6361:20031458, S2CID 18879265.
  4. de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  5. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
  6. McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
  7. "mu.01 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-17.
  8. Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430 (1): 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272, S2CID 17804304.
  9. Tabur, V.; Bedding, T. R. (2009), "Long-term photometry and periods for 261 nearby pulsating M giants", Monthly Notices of the Royal Astronomical Society, 400 (4): 1945–61, arXiv:0908.3228, Bibcode:2009MNRAS.400.1945T, doi:10.1111/j.1365-2966.2009.15588.x, S2CID 15358380.
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