HD 28700

Last updated
HD 28700
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Caelum
Right ascension 04h 29m 20.0860s [1]
Declination −46° 30′ 54.9738″ [1]
Apparent magnitude  (V)6.12±0.01 [2]
Characteristics
Evolutionary stage red giant branch [1]
Spectral type K1 III [3]
B−V color index +1.06 [4]
Astrometry
Radial velocity (Rv)10.7±0.4 [5]  km/s
Proper motion (μ)RA: +51.283  mas/yr [1]
Dec.: +36.503  mas/yr [1]
Parallax (π)8.4964 ± 0.0265  mas [1]
Distance 384 ± 1  ly
(117.7 ± 0.4  pc)
Absolute magnitude  (MV)+0.69 [6]
Details
Mass 3.0 [1]   M☉
Radius 10.5 [1]   R☉
Luminosity 56±2 [7]   L☉
Surface gravity (log g)2.61 [1]   cgs
Temperature 4,760±90 [7]   K
Metallicity [Fe/H]+0.08 [8]   dex
Rotational velocity (v sin i)<1 [9]  km/s
Age 377 [1]   Myr
Other designations
5 G. Caeli, CD−46°1427, CPD−46°433, GC  5485, HD  28700, HIP  20934, HR  1433, SAO  216832 [10] [11]
Database references
SIMBAD data

HD 28700 (HR 1433) is a solitary star in the southern constellation Caelum. It has an apparent magnitude of 6.12, [2] making it visible to the naked eye under ideal conditions. Parallax measurements place the object at a distance of 384 light years [1] and is currently receding with a heliocentric radial velocity of 10.7  km/s . [5]

HD 28700 has a stellar classification of K1 III, [3] indicating that it is a red giant. It has three times the Sun's mass and has expanded to ten times its radius. It radiates at 56 times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,760  K , [7] giving it an orange hue. HD 28700 has a projected rotational velocity too low to be measured accurately due to it being less than 1  km/s . [9] HD 28700 has 120% the abundance of iron relative to the Sun. [8] At a modeled age of 377 million years, HD 28700 is on the red giant branch fusing hydrogen in a shell around an inert helium core. [1]

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Pi<sup>2</sup> Octantis Star in the constellation Octans

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Pi1 Octantis (Pi1 Oct), Latinized π1 Octantis, is a solitary star in the southern circumpolar constellation Octans. It is faintly visible to the naked eye with an apparent magnitude 5.64, and is estimated to be 387 light years away. However, it is receding with a heliocentric radial velocity of 14 km/s.

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<span class="mw-page-title-main">HD 106248</span> Star in the constellation Chamaeleon

HD 106248, also known as HR 4649, is a solitary, orange hued star located in the southern circumpolar constellation Chamaeleon. It has an apparent magnitude of 6.34, placing it near the limit for naked eye visibility. Based on parallax measurements from Gaia DR3, the object is estimated to be 358 light years away from the Solar System. It appears to be receding with a heliocentric radial velocity of 34.5 km/s. At its current distance, HD 106248's brightness is diminished by 0.32 due to interstellar dust and Eggen (1993) lists it as a member of the old (thick) disk population.

References

  1. 1 2 3 4 5 6 7 8 9 10 11 12 Vallenari, A.; et al. (Gaia Collaboration) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics . arXiv: 2208.00211 . doi: 10.1051/0004-6361/202243940 . Gaia DR3 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 Houk, Nancy (1978). "Michigan catalogue of two-dimensional spectral types for the HD stars". Ann Arbor: Dept. Of Astronomy. Bibcode:1978mcts.book.....H.
  4. ↑ Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
  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. 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. ISSN   1063-7737. S2CID   119257644.
  7. 1 2 3 Charbonnel, C.; Lagarde, N.; Jasniewicz, G.; North, P. L.; Shetrone, M.; Krugler Hollek, J.; Smith, V. V.; Smiljanic, R.; Palacios, A.; Ottoni, G. (January 2020). "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era". Astronomy & Astrophysics. 633: A34. arXiv: 1910.12732 . Bibcode:2020A&A...633A..34C. doi: 10.1051/0004-6361/201936360 . eISSN   1432-0746. ISSN   0004-6361.
  8. 1 2 Eggen, O. J. (February 1994). "Evolved GK stars near the Sun. 2: The young disk population". The Astronomical Journal. 107: 594. Bibcode:1994AJ....107..594E. doi: 10.1086/116879 . ISSN   0004-6256.
  9. 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.
  10. ↑ "HD 28700". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved June 17, 2022.
  11. ↑ Gould, Benjamin Apthorp (1878). "Uranometria Argentina: brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral: con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
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