HD 201507

Last updated
HD 201507
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Equuleus
Right ascension 21h 09m 58.2645s [1]
Declination +02° 56′ 37.3096″ [1]
Apparent magnitude  (V)6.43±0.01 [2]
Characteristics
Spectral type F5 IV [3]
U−B color index +0.06 [4]
B−V color index +0.37 [4]
Astrometry
Radial velocity (Rv)−42.8±2.4 [5]  km/s
Proper motion (μ)RA: +48.902  mas/yr [1]
Dec.: +10.883  mas/yr [1]
Parallax (π)15.2530 ± 0.3122  mas [1]
Distance 214 ± 4  ly
(66 ± 1  pc)
Absolute magnitude  (MV)2.12 [6]
Details
Mass 1.45±0.23 [7]   M☉
Radius 2.2±0.1 [7]   R☉
Luminosity 9.147±0.21 [1]   L☉
Surface gravity (log g)3.91±0.09 [7]   cgs
Temperature 6,846±233 [8]   K
Metallicity [Fe/H]+0.09 [9]   dex
Rotational velocity (v sin i)16.4±10.6 [10]  km/s
Age 1.21 [8]   Gyr
Other designations
13 G. Equulei [11] , AG+02°2701, BD+02°4311, GC  29582, HD  201507, HIP  104481, HR  8095, SAO  126587 [12]
Database references
SIMBAD data

HD 201507, also designated HR 8095, is a white-hued star located in the equatorial constellation Equuleus. It has an apparent magnitude of 6.43, [2] placing it near the limit for naked eye visibility. Parallax measurements place the object at a distance of 214 light years [1] and it is currently drifting closer with a heliocentric radial velocity of −43  km/s . [5]

There have been disagreements in classifying the star's spectrum. Eugene A. Harlan found a spectral classification of F5 IV, [3] indicating that it is a F-type subgiant that is evolving towards the red giant branch. On the other hand, Nancy Houk and Carrie Swift (1999) found a class of F2 V, [13] indicating that it is still on the main sequence.

HD 201507 has 1.45 times the mass of the Sun and a slightly enlarged radius of 2.2  R☉ [7] due to its evolved state. It shines with a luminosity of about 9  L☉ [1] from its photosphere at an effective temperature of 6,846 K. [8] HD 201507 is slightly metal enriched, with a metallicity 123% that of the Sun. [9] This star has a modest projected rotational velocity of 16  km/s [10] and is estimated to be 1.21 billion years old, [8] only a quarter the age of the Sun.

Related Research Articles

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<span class="mw-page-title-main">HD 90132</span> Solitary White-hued star and high proper motion star

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<span class="mw-page-title-main">HD 26764</span> Star in the constellation Camelopardalis

HD 26764, also known as HR 1314 or rarely 14 H. Camelopardalis, is a solitary white hued star located in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.19, making it faintly to the naked eye if viewed under good conditions. Gaia DR3 parallax measurements place the object at a distance of 266 light years and is drifting closer with a poorly constrained heliocentric radial velocity of 3 km/s. At its current distance, HD 26764's brightness is diminished by 0.26 magnitudes due to interstellar dust.

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<span class="mw-page-title-main">Zeta Octantis</span> High proper motion star in Octans

Zeta Octantis, Latinized from ζ Octantis, is a solitary, yellowish-white hued star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.42, making it faintly visible to the naked eye under ideal conditions. The star is located relatively close at a distance of only 156 light-years based on Gaia DR3 parallax measurements, but is drifting closer with a radial velocity of −3.6 km/s. At its current distance, Zeta Octantis' brightness is diminished by 0.25 magnitudes due to interstellar dust.

HD 28454, also known as HR 1418, is a solitary, yellowish-white hued star located in the southern constellation Caelum, the chisel. It has an apparent magnitude of 6.1, making it faintly visible to the naked eye under ideal conditions. This star is located relatively close at a distance of about 107 light years based on parallax measurements of Gaia DR3 but is receding with a heliocentric radial velocity of 15 km/s.

<span class="mw-page-title-main">Phi Octantis</span> Star in the constellation Octans

Phi Octantis, Latinized from φ Octantis, is a solitary star in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.46, making it faintly visible to the naked eye if viewed under ideal conditions. The star is relatively close at a distance of 194 light years but is receding from the Sun with a heliocentric radial velocity of 5 km/s.

HD 75171, also known as HR 3495, is a solitary, white hued star located in the southern constellation of Volans. It has an apparent magnitude of 6.02, making it faintly visible to the naked eye under ideal conditions. The object is relatively close at a distance of 191 light years but is receding with a heliocentric radial velocity of 10.7 km/s. Eggen (1995) lists it as a probable member of the Hyades Supercluster.

<span class="mw-page-title-main">Omega Octantis</span> Star in the constellation of Octans

Omega Octantis,, is a solitary, bluish-white hued star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.87, allowing it to be faintly seen with the naked eye. Based on the object's parallax measurements, it is estimated to be 328 light years distant. However, it is drifting closer with a heliocentric radial velocity −7.6 km/s.

HD 30432, also known as HR 1526, is a solitary, orange hued star located in the southern constellation of Caelum, the chisel. It has an apparent magnitude of 6.04, making it faintly visible to the naked eye if viewed under ideal conditions. Based on parallax measurements from the Gaia spacecraft, the object is estimated to be 310 light years distant. It appears to be approaching the Solar System, having a fairly constrained radial velocity of −6 km/s. Eggen (1993) lists it as a member of the old disk population.

HD 167714, also known as HR 6837, is a solitary, orange hued star located in the southern circumpolar constellation Octans. It has apparent magnitude of 5.95, allowing it to be faintly visible to the naked eye. Based on parallax measurements from Gaia, the object is estimated to be 359 light years distant. With a heliocentric radial velocity of −13.9 km/s, it is approaching the Solar System.

HD 222060, also known as HR 8957, is a solitary, orange hued star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.98, allowing it to be faintly visible to the naked eye. Based on parallax measurements from GAIA, the object is estimated to be 536 light years distant. It appears to be slowly receding from the Solar System, having a heliocentric radial velocity of 2.3 km/s.

HD 218108, also known as HR 8786, is a solitary, white hued star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 6.11, making it faintly visible to the naked eye under ideal conditions. Based on parallax measurements from Gaia DR3, the object is estimated to be 247 light years away. It appears to be approaching the Solar System with a fairly constrained radial velocity of −7 km/s. Paunzen et al. (2001) lists it as a λ Boötis star with a weak magnesium line.

<span class="mw-page-title-main">HD 201772</span> Star in the constellation Microscopium

HD 201772, also known as HR 8104, is a yellowish-white hued star located in the southern constellation Microscopium. It has an apparent magnitude of 5.26, making it one of the brighter members of this generally faint constellation. The object is located relatively close at a distance of 111 light-years based on Gaia DR3 parallax measurements but is approaching closer with a heliocentric radial velocity of −41 km/s. At its current distance, HD 201772's brightness is diminished by 0.11 magnitudes due to interstellar dust.

<span class="mw-page-title-main">HD 36187</span> Star in the constellation of Columba

HD 36187, also known as HR 1835, is a solitary, bluish-white hued star located in the southern constellation Columba, the dove. It has an apparent magnitude of 5.55, making it faintly visible to the naked eye under ideal conditions. Based on parallax measurements from the Gaia spacecraft, it is estimated to be 282 light years away from the Solar System. However, it is receding rapidly with a heliocentric radial velocity of 50 km/s. At its current distance, HD 36187's brightness is diminished by 0.21 magnitude due to interstellar dust.

<span class="mw-page-title-main">HD 170642</span> A-type dwarf; Corona Australis

HD 170642, also designated as HR 6942 or rarely 13 G. Coronae Australis, is a single star located in the southern constellation Corona Australis. It is faintly visible to the naked eye as a white hued star with an apparent magnitude of 5.16. The object is located relatively close at a distance of 229 light years based on Hipparcos parallax measurements, but it is approaching the Solar System with a somewhat constrained heliocentric radial velocity of −6 km/s. At its current distance, HD 170642's brightness is diminished by 0.28 magnitudes due to interstellar dust. It has an absolute magnitude of +0.93.

HD 99015, also known as HR 4397 or rarely 31 G. Chamaeleontis, is a solitary white-hued star located in the southern circumpolar constellation Chamaeleon. It has an apparent magnitude of 6.42, placing it near the limit for naked eye visibility even in ideal conditions. The object is located relatively close at a distance of 243 light years and is drifting closer with a somewhat constrained heliocentric radial velocity of −5.9 km/s. At its current distance, HD 99015's brightness is diminished by 0.31 magnitudes due to interstellar dust. It has an absolute magnitude of +2.08.

<span class="mw-page-title-main">HD 192886</span> High proper motion star; F-type dwarf

HD 192886, also known as HR 7749 or rarely 84 G. Telescopii, is a solitary, yellowish-white hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.13, making it barely visible to the naked eye, even in ideal conditions. The object is located relatively close at a distance of only 103 light years but is drifting closer with a heliocentric radial velocity of −29.6 km/s. At its current distance, HD 192886's brightness is diminished by 0.13 magnitudes due to extinction from interstellar dust. It has an absolute magnitude of +3.69.

<span class="mw-page-title-main">HD 174474</span> High proper motion star; Telescopium

HD 174474, also designated as HR 7095 or rarely 35 G. Telescopii, is a solitary white-hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.17, placing it near the limit for naked eye visibility. The object is located relatively close at a distance of 244 light years based on Gaia DR3 parallax measurements but is drifting closer with a heliocentric radial velocity of −44 km/s. At its current distance, HD 174474's brightness is diminished by 0.26 magnitudes due to interstellar dust. It has an absolute magnitude of +1.61.

References

  1. 1 2 3 4 5 6 7 8 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.
  2. 1 2 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN   0004-6361.
  3. 1 2 Harlan, E. A. (June 1974). "MK classifications for F-and G-type stars. 3". The Astronomical Journal. 79: 682. Bibcode:1974AJ.....79..682H. doi: 10.1086/111597 . ISSN   0004-6256.
  4. 1 2 Cousins, A. W. J. (1971). "Photometric standard stars". Royal Observatory Annals. 7. Bibcode:1971ROAn....7.....C.
  5. 1 2 Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN   1562-6873. ISSN   1063-7737. S2CID   119231169.
  6. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN   1562-6873. ISSN   1063-7737. S2CID   255204555.
  7. 1 2 3 4 Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694 . Bibcode:2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467 . ISSN   0004-6256.
  8. 1 2 3 4 David, Trevor J.; Hillenbrand, Lynne A. (12 May 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 . eISSN   1538-4357.
  9. 1 2 Netopil, Martin (4 May 2017). "Metallicity calibrations for dwarf stars and giants in the Geneva photometric system". Monthly Notices of the Royal Astronomical Society. 469 (3): 3042–3055. arXiv: 1705.00883 . Bibcode:2017MNRAS.469.3042N. doi: 10.1093/mnras/stx1077 . eISSN   1365-2966. ISSN   0035-8711.
  10. 1 2 De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars: V. Southern stars⋆⋆⋆". Astronomy & Astrophysics. 561: A126. arXiv: 1312.3474 . Bibcode:2014A&A...561A.126D. doi: 10.1051/0004-6361/201220762 . ISSN   0004-6361.
  11. ↑ Gould, B. A. Uranometria Argentina. Reprinted and updated by Pilcher, F. Archived from the original on 2012-02-27. Retrieved 2012-01-06.
  12. ↑ "HD 201507". sim-id. Retrieved 2021-07-05.
  13. ↑ Houk, Nancy; Swift, Carrie (1999). Michigan catalogue of two-dimensional spectral types for the HD Stars ; vol. 5. Bibcode:1999mctd.book.....H.
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