V762 Cassiopeiae

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V762 Cassiopeiae
This is a map that pinpoints V762 Cassiopeiae location.
The location of V762 Cassiopeiae
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia
Right ascension 01h 16m 11.902s[1]
Declination +71° 44′ 37.83″[1]
Apparent magnitude (V) 5.86[2]
Characteristics
Evolutionary stage Red supergiant[3]
Spectral type K5 I[3]
Astrometry
Radial velocity (Rv)−21.37±0.91[1] km/s
Proper motion (μ) RA: -1.658 mas/yr[1]
Dec.: 1.791 mas/yr[1]
Parallax (π)1.3148 ± 0.0693 mas[1]
Distance2,500 ± 100 ly
(760 ± 40 pc)
Details
Mass16.9±2.2[4] M☉
Radius192.76+26.3
−29[5] R☉
Luminosity12,470[a][3] L☉
Temperature3645[6] K
Age10.0±1.6[4] Myr
Other designations
V762 Cas, BD+70 90, HD 7389, HIP 5926, HR 365, SAO 4358, TYC 4305-2038-1[2]
Database references
SIMBADdata

V762 Cassiopeiae is a K-type red supergiant[3] located about 2,500 light-years away in the Cassiopeia constellation.[2] Its apparent magnitude is 5.86, which makes it visible to the naked eye.[2] It is a relatively cool star with an average surface temperature of 3645 K.[6]

Characteristics[edit]

This is an evolved K-type red supergiant star with a spectral type of K0 I.[3] It has around 16.9 times the Sun's mass[4] and 193 times the Sun's radius.[5] It radiates 12,470 times the solar luminosity[3] from its outer atmosphere at an effective temperature of 3645 K.[6] V762 Cassiopeiae is located 2,480 light-years away, based in a parallax from Gaia DR3, and is moving towards Earth at a velocity of 21.37 km/s.[1][b] Its age is estimated to be 10 million years.[4]

Distance and titleholding[edit]

Some websites claim V762 Cassiopeiae is the "farthest star visible to the naked eye", at a distance of 16,308 light-years.[7][8] This is inconsistent with parallax measurements from both Hipparcos, which found a parallax of 1.18±0.45 mas, corresponding to a distance of about 2,800 light-years,[9] and Gaia DR3, which lists a parallax of 1.3148±0.0693 mas, corresponding to a distance of about 2,500 light-years.[1][b] The websites claiming that V762 Cassiopeiae is the "farthest star visible to the naked eye" also do not cite any references for the distance of 16,308 light-years, making the origin of this value uncertain.

References[edit]

  1. ^ a b c d e f g Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b c d "HD 7389". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 9 April 2024.
  3. ^ a b c d e f Messineo, M.; Brown, A. G. A. (2019-07-01). "A Catalog of Known Galactic K-M Stars of Class I Candidate Red Supergiants in Gaia DR2". The Astronomical Journal. 158 (1): 20. arXiv:1905.03744. Bibcode:2019AJ....158...20M. doi:10.3847/1538-3881/ab1cbd. ISSN 0004-6256. Data can be acessed here at VizieR.
  4. ^ a b c d Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011-01-01). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410 (1): 190–200. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. ISSN 0035-8711. Data can be acessed here at VizieR.
  5. ^ a b Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  6. ^ a b c McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012-11-01). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–357. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. ISSN 0035-8711.
  7. ^ "Farthest Star You Can See With The Unaided Eye". Cosmoknowledge. 2021-03-26. Retrieved 2024-04-11.
  8. ^ "How Far Back In Time Can We See With Our Naked Eye?". Big Think. 2021-05-17. Retrieved 2024-04-11.
  9. ^ "HIP 5926". VizieR. Centre de données astronomiques de Strasbourg. Retrieved 11 April 2024.
  1. ^ Derived from a bolometric magnitude of -5.42.
  2. ^ a b From the equation 1/(P/1000)=D, where P is the parallax in milliarcseconds and D is the distance in parsecs.
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