NR Canis Majoris

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NR Canis Majoris
NRCMaLightCurve.png
A light curve for NR Canis Majoris, plotted from TESS data [1]
Observation data
Epoch J2000        Equinox J2000
Constellation Canis Major
Right ascension 07h 27m 07.99012s [2]
Declination −17° 51′ 53.5058″ [2]
Apparent magnitude  (V)5.60 [3] (5.66 + 9.23) [4]
Characteristics
Spectral type F2V [5]
B−V color index +0.314±0.002 [3]
Variable type δ Sct [6]
Astrometry
Radial velocity (Rv)−29.2±2.9 [3]  km/s
Proper motion (μ)RA: −2.420 [2]   mas/yr
Dec.: +1.388 [2]   mas/yr
Parallax (π)10.9688 ± 0.0917  mas [2]
Distance 297 ± 2  ly
(91.2 ± 0.8  pc)
Absolute magnitude  (MV)0.78 [3]
Details
A
Mass 1.62 [7] or 2.18±0.04 [8]   M☉
Radius 3.90+0.18
−0.24 [2]   R☉
Luminosity 37.4±0.4 [2]   L☉
Surface gravity (log g)3.65 [7]   cgs
Temperature 7,227+238
−160 [2]   K
Rotational velocity (v sin i)185 [9]  km/s
Age 1.494 [7]   Gyr
Other designations
NR CMa, BD−17°1980, HD  58954, HIP  36186, HR  2853, SAO  152894, ADS  6093, CCDM J07271-1752AB, WDS J07271-1752 [10]
Database references
SIMBAD data

NR Canis Majoris is a binary star [11] system in the southern constellation of Canis Major, located to the east of Sirius and Gamma Canis Majoris near the constellation border with Puppis. It has a yellow-white hue and is dimly visible to the naked eye with a combined apparent visual magnitude that fluctuates around 5.60. [3] It is located at a distance of approximately 297  light years from the Sun based on parallax. [2] The system is drifting closer to the Sun with a radial velocity of −29 km/s, [3] and in about three million years it is predicted to approach within 14.1+4.7
−4.0 ly. [12] At that time, the star will become the brightest in the night sky, potentially reaching magnitude −0.88. [13]

The magnitude 5.66 [4] primary component is an F-type main-sequence star with a stellar classification of F2V. [5] The star was discovered to be a variable star when the Hipparcos data was analyzed. It was given its variable star designation, NR Canis Majoris, in 1999. [14] It is a Delta Scuti variable [6] that varies by a few hundredths of a magnitude over roughly 16 hours. [15] The star is an estimated 1.5 billion years old. [7] It has a high rate of spin with a projected rotational velocity of 185 km/s, which is giving the star an equatorial bulge that is estimated to be 8% larger than the polar radius. [9]

The secondary companion is magnitude 9.23 and lies at an angular separation of 1.3″ along a position angle of 39°, as of 2005. [4]

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Upsilon Ursae Majoris, Latinized from υ Ursae Majoris, is a binary star in the northern circumpolar constellation of Ursa Major. It is visible to the naked eye with an apparent visual magnitude of +3.79. Based upon an annual parallax shift of 13.24 mas, it is located roughly 246 light-years from the Sun.

<span class="mw-page-title-main">Theta Canis Majoris</span> Star in the constellation Canis Major

Theta Canis Majoris is a solitary, orange-hued star near the northern edge of the constellation Canis Major, forming the nose of the "dog". The star is visible to the naked eye with an apparent visual magnitude of 4.08. Based upon an annual parallax shift of 12.07 mas as seen from Earth, it is located about 270 light years from the Sun. The star is moving away from Earth with a radial velocity of +96.2 km/s.

<span class="mw-page-title-main">Iota Canis Majoris</span> Variable star in the constellation Canis Major

Iota Canis Majoris, Latinized from ι Canis Majoris, is a solitary variable supergiant star in the southern constellation of Canis Major. It is visible to the naked eye with an apparent visual magnitude that varies between +4.36 and +4.40. The distance to this star is approximately 2,500 light years based on spectroscopic measurements. It is drifting further away with a radial velocity of +42 km/s.

<span class="mw-page-title-main">Kappa Canis Majoris</span> Star in the constellation Canis Major

Kappa Canis Majoris, Latinized from κ Canis Majoris, is a solitary, blue-white hued star in the constellation Canis Major. It is visible to the naked eye with an apparent visual magnitude of +3.87. Based upon an annual parallax shift of 7.70 mas as seen from Earth, this star is located about 660 light years from the Sun.

Nu1 Canis Majoris (ν1 Canis Majoris) is a binary star in the constellation Canis Major. It is visible to the naked eye with a combined apparent visual magnitude of 5.7. Based on parallax shift of 12.366 mas as seen from our orbit, this system is approximately 264 light years from the Sun.

Omicron<sup>1</sup> Canis Majoris Variable star in the constellation Canis Major

Omicron1 Canis Majoris is a red supergiant star in the constellation Canis Major. It is also a variable star.

Pi Canis Majoris is a binary star system in the southern constellation of Canis Major. It is visible to the naked eye, having an apparent visual magnitude of +4.69. Based upon an annual parallax shift of 33.80 mas as seen from Earth, this system is located 96.5 light years from the Sun. The star is moving in the general direction of the Sun with a radial velocity of −37.9 km/s. It will make its closest approach in around 733,000 years when it comes within 23 ly (7 pc).

<span class="mw-page-title-main">Sigma Canis Majoris</span> Variable star in the constellation Canis Major

Sigma Canis Majoris, also named Unurgunite, is a variable star in the southern constellation of Canis Major. It is approximately 1,290 light-years from the Sun and has an average apparent visual magnitude of +3.41.

<span class="mw-page-title-main">10 Canis Majoris</span> Star in the constellation Canis Major

10 Canis Majoris is a single variable star in the southern constellation of Canis Major, located roughly 1,980 light years away from the Sun. It has the variable star designation FT Canis Majoris; 10 Canis Majoris is the Flamsteed designation. This body is visible to the naked eye as a faint, blue-white hued star with a baseline apparent visual magnitude of 5.23. It is moving away from the Earth with a heliocentric radial velocity of +34 km/s.

<span class="mw-page-title-main">12 Canis Majoris</span> Variable star in the constellation Canis Major

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<span class="mw-page-title-main">26 Canis Majoris</span> Star in the constellation Canis Major

26 Canis Majoris is a variable star in the southern constellation of Canis Major, located around 1,010 light years away from the Sun. It has the variable star designation MM Canis Majoris; 26 Canis Majoris is the Flamsteed designation. This object is visible to the naked eye as a dim, blue-white hued star with a baseline apparent visual magnitude of 5.89. It is moving further from the Earth with a heliocentric radial velocity of +22 km/s.

Delta<sup>2</sup> Canis Minoris Star in the constellation Canis Minor

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<span class="mw-page-title-main">V1073 Scorpii</span> Variable star in the constellation Scorpius

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<span class="mw-page-title-main">BW Vulpeculae</span> Star in the constellation Vulpecula

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<span class="mw-page-title-main">HD 118285</span> SPB star in the constellation Chamaeleon.

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References

  1. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  2. 1 2 3 4 5 6 7 8 9 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.
  3. 1 2 3 4 5 6 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.
  4. 1 2 3 Mason, B. D.; et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi: 10.1086/323920 . Retrieved 2015-07-22.
  5. 1 2 Houk, Nancy; Smith-Moore, M. (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 4. Ann Arbor: Department of Astronomy, University of Michigan. Bibcode:1988mcts.book.....H.
  6. 1 2 Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID   125853869.
  7. 1 2 3 4 David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv: 1501.03154 . Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. S2CID   33401607.
  8. ↑ Zorec, J.; Royer, F. (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.
  9. 1 2 van Belle, Gerard T. (March 2012). "Interferometric observations of rapidly rotating stars". The Astronomy and Astrophysics Review. 20 (1): 51. arXiv: 1204.2572 . Bibcode:2012A&ARv..20...51V. doi:10.1007/s00159-012-0051-2. S2CID   119273474.
  10. ↑ "NR CMa". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 12 February 2017.
  11. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv: 0806.2878 . Bibcode:2008MNRAS.389..869E. doi: 10.1111/j.1365-2966.2008.13596.x . S2CID   14878976.
  12. ↑ Bailer-Jones, C. A. L. (March 2015). "Close encounters of the stellar kind". Astronomy & Astrophysics. 575: 13. arXiv: 1412.3648 . Bibcode:2015A&A...575A..35B. doi:10.1051/0004-6361/201425221. S2CID   59039482. A35.
  13. ↑ Tomkin, Jocelyn (April 1998). "Once and Future Celestial Kings". Sky and Telescope. 95 (4): 59–63. Bibcode:1998S&T....95d..59T.
  14. ↑ Kazarovets, E. V.; Samus, N. N.; Durlevich, O. V.; Frolov, M. S.; Antipin, S. V.; Kireeva, N. N.; Pastukhova, E. N. (January 1999). "The 74th Special Name-list of Variable Stars" (PDF). Information Bulletin on Variable Stars. 4659: 1–27. Bibcode:1999IBVS.4659....1K . Retrieved 1 January 2025.
  15. ↑ Watson, Christopher (4 January 2010). "LS Canis Majoris". AAVSO Website. American Association of Variable Star Observers . Retrieved 12 July 2014.
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