85 Ceti

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85 Ceti
Local 85 ceti.png
Location 85 Ceti (HD 16861) within the Aries constellation (pink)
Observation data
Epoch J2000       Equinox J2000
Constellation Aries
Right ascension 02h 42m 28.93647s [1]
Declination +10° 44 30.2137 [1]
Apparent magnitude  (V)6.30 [2]
Characteristics
Spectral type A2 V [3]
U−B color index +0.06 [2]
B−V color index +0.06 [2]
R−I color index 0.02
Astrometry
Radial velocity (Rv)+6.1 [4]  km/s
Proper motion (μ)RA: –22.88 [1]   mas/yr
Dec.: –22.95 [1]   mas/yr
Parallax (π)7.87 ± 1.05  mas [1]
Distance approx. 410  ly
(approx. 130  pc)
Details
Mass 2.38 ± 0.15 [5]   M
Luminosity 48 [5]   L
Temperature 8,810 [5]   K
Rotational velocity (v sin i)18 [6]  km/s
Other designations
BD+10° 360, HD 16861, HIP 12647, HR 797, NSV 899, SAO 93067. [7]
Database references
SIMBAD data

85 Ceti is an older Flamsteed designation [8] for a star that is now within the borders of the northern constellation of Aries, [9] the ram. In the present day it is known by star catalogue designations such as HD 16861 and HR 797. [7] It has an apparent visual magnitude of 6.30 [2] and is approximately 410 light-years (130 parsecs ) distant from the Earth. This is an A-type main sequence star with a stellar classification of A2 V. [3] It has 2.4 times the mass of the Sun and shines with 48 times the Sun's luminosity. This energy is being radiated into outer space from the star's outer atmosphere at an effective temperature of 8,810 K. [5] This heat gives it the white-hued glow of an A-type star. [10]

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Psi<sup>3</sup> Aquarii Binary star in the constellation Aquarius

Psi3 Aquarii, Latinized from ψ3 Aquarii, is the Bayer designation for a visual binary star system in the constellation of Aquarius. It has an apparent visual magnitude of 4.98, which is bright enough to be seen with the naked eye. Parallax measurements give a distance estimate of roughly 262 light-years.

Sigma Aquarii Star in the constellation Aquarius

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Upsilon Aquilae Star in the constellation Aquila

Upsilon Aquilae, Latinized from υ Aquilae, is the Bayer designation for a star in the equatorial constellation of Aquila. With an apparent visual magnitude of +5.91 it is a faint star but visible to the naked eye from suburban skies. It has an annual parallax shift of 18.66 mas, indicating a distance of around 175 light-years. The star is drifting closer with a radial velocity of –30 km/s.

Lambda Arietis Binary star system in the constellation Aries

Lambda Arietis is the Bayer designation for a double star in the northern constellation of Aries. Based upon an annual parallax shift of 25.32 arcseconds, this system is approximately 129 light-years distant from Earth. The pair have a combined apparent visual magnitude of 4.79, which is bright enough to be viewed with the naked eye. Because the yellow secondary is nearly three magnitudes fainter than the white primary, they are a challenge to split with quality 7× binoculars and are readily resolvable at 10×.

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4 Arietis is a single star in the northern constellation of Aries, the ram. 4 Arietis is the Flamsteed designation. It is visible to the naked eye as a dim, blue-white hued star with an apparent visual magnitude of 5.86. The star has an annual parallax shift of 11.46±0.15 mas, which is equivalent to a distance of 285 light-years from the Sun. It is moving further from the Earth with a heliocentric radial velocity of +6 km/s.

56 Aquarii, abbreviated 56 Aqr, is a star in the constellation of Aquarius. 56 Aquarii is its Flamsteed designation. It is a sixth magnitude star, having an apparent visual magnitude of 6.36, and thus is a challenge to view with the naked eye. Based upon an annual parallax shift of 5.07 mas, it is located around 643 light years from the Earth. At that distance, the visual magnitude is diminished by an extinction of 0.12 due to interstellar dust. The star is moving closer with a heliocentric radial velocity of −28 km/s. It is a candidate runaway star showing a transverse peculiar velocity of 213.87 km/s.

11 Arietis is a star in the northern constellation of Aries. 11 Arietis is the Flamsteed designation. It has an apparent visual magnitude of 6.01, which makes it a challenging target to view with the naked eye in suitably dark skies. Based upon an annual parallax shift of 3.72 mas, the distance to this star is approximately 880 light-years.

14 Aquilae is a probable spectroscopic binary star system in the equatorial constellation of Aquila. 14 Aquilae is the Flamsteed designation though it also bears the Bayer designation g Aquilae. It is visible to the naked eye as a dim, white-hued star with an apparent visual magnitude of 5.42, and it is located at a distance of approximately 500 light-years from Sun. The star is moving closer to the Earth with a heliocentric radial velocity of −39 km/s, and may come as close as 136 light-years in around 3.5 million years.

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Gamma Camelopardalis Star in the constellation Camelopardalis

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54 Ceti Star in the constellation Aries

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Omega Aurigae, Latinized from ω Aurigae, is the Bayer designation for a double star in the northern constellation of Auriga. Its apparent magnitude is 4.95, which is bright enough to be seen with the naked eye. The distance to this system, as determined using parallax measurements, is approximately 162 light-years. The system is a member of the Columba group of co-moving stars.

16 Camelopardalis is a single star in the northern circumpolar constellation Camelopardalis, located 348 light years away from the Sun as determined from parallax measurements. It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 5.28. This object is moving further from the Earth with a heliocentric radial velocity of around 12 km/s.

Omicron Herculis Variable star in the constellation Hercules

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HD 93905 Star in the constellation Antlia

HD 93905 is a solitary star located in the southern constellation Antlia. The star has an absolute magnitude of 0 and an apparent magnitude of 5.61, making it faintly visible to the naked eye under ideal conditions. The star is located 371 light years away based on its parallax shift and is drifting closer with a helocentric radial velocity of −9.6 km/s.

Alruba Star in the constellation Draco

Alruba, a name derived from Arabic for "the foal", is a suspected astrometric binary star system in the northern circumpolar constellation of Draco. It is just barely visible to the naked eye as a dim point of light with an apparent visual magnitude of 5.76. Based on parallax measurements obtained during the Gaia mission, it is located at a distance of about 457 light-years from the Sun. The system is drifting closer with a radial velocity of −2 km/s.

HD 34868 is a solitary star located in the southern constellation Columba. With an apparent magnitude of 5.97, it's barely visible to the unaided eye. The star is located 410 light years away based on parallax, but is drifting away with a heliocentric radial velocity of 18 km/s.

References

  1. 1 2 3 4 5 van Leeuwen, F. (November 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. 1 2 3 4 Johnson, H. L.; et al. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4 (99): 99. Bibcode:1966CoLPL...4...99J.
  3. 1 2 Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
  4. Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Washington, Carnegie Institute of Washington D.C., Bibcode:1953GCRV..C......0W.
  5. 1 2 3 4 Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv: 1201.2052 , Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID   55586789.
  6. Royer, F.; Zorec, J.; Gómez, A. E. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv: astro-ph/0610785 , Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224, S2CID   18475298.
  7. 1 2 "HD 16861". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2012-07-18.{{cite web}}: CS1 maint: postscript (link)
  8. Smart, W. M. (June 1939), "The Ursa Major cluster, (Second paper)", Monthly Notices of the Royal Astronomical Society , 99 (9): 710–722, Bibcode:1939MNRAS..99..710S, doi: 10.1093/mnras/99.9.710 . Page 712 of this reference links 85 Cet to B.S. 797; B.S., an abbreviation of the Bright Star Catalogue, was an earlier version of the Harvard Revised Photometry Catalogue, or HR. Hence, 85 Ceti is the same as HR 797.
  9. Hoffleit, D. (July 1979), "Discordances in Star Designations", Bulletin d'Information du Centre de Données Stellaires, 17 (17): 38, Bibcode:1979BICDS..17...38H.
  10. "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 18, 2012, retrieved 2012-01-16.