| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vulpecula |
| Right ascension | 19h 25m 28.6030389750s [1] |
| Declination | +19° 47′ 54.059820728″ [1] |
| Apparent magnitude (V) | 5.16 [2] |
| Characteristics | |
| Spectral type | K0 III [2] |
| B−V color index | +0.980 [2] |
| Astrometry | |
| Radial velocity (Rv) | +0.95 ± 0.12 [1] km/s |
| Proper motion (μ) |
RA: +87.392 ± 0.137
[1]
mas/
yr Dec.: -73.038 ± 0.152 [1] mas/ yr |
| Parallax (π) | 12.5320 ± 0.1008 mas [1] |
| Distance | 260 ± 2
ly (79.8 ± 0.6 pc) |
| Absolute magnitude (MV) | +0.54 [3] |
| Details | |
| Mass | 1.72 [2] M☉ |
| Radius | 11.42 [1] R☉ |
| Luminosity | 67.6 [2] L☉ |
| Surface gravity (log g) | 3.01 [4] cgs |
| Temperature | 4,763±26 [2] K |
| Metallicity [Fe/H] | −0.20 [4] dex |
| Rotational velocity (v sin i) | 2.9 [5] km/s |
| Age | 2.63 [2] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
4 Vulpeculae is a single, [7] orange-hued star in the northern constellation of Vulpecula. It forms part of the asterism, formerly thought to be an open cluster, called the coathanger or Brocchi's Cluster. [8] [9] The star is faintly visible to the naked eye with an apparent visual magnitude of 5.16. [2] The distance to this star, based upon an annual parallax shift of 12.5320±0.1008 mas, [1] is around 260 light years.
At the age of about 2.6 billion years old, [2] this is an aging giant star with a stellar classification of K0 III, [2] having exhausted the supply of hydrogen at its core and evolved off the main sequence. It is now a red clump giant, indicating that it is on the horizontal branch and is generating energy through the fusion of helium at its core. [10] The star has an estimated 1.72 [2] times the mass of the Sun and has expanded to 11.42 [1] times the Sun's radius. It is radiating 67.6 [2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,763 K. [2]
- ^ a b c d e f g h i 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.
- ^ a b c d e f g h i j k l m Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv: 1507.01466, Bibcode: 2015AJ....150...88L, doi: 10.1088/0004-6256/150/3/88, S2CID 118505114.
- ^ 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.
- ^ a b Soubiran, C.; et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv: 1004.1069, Bibcode: 2010A&A...515A.111S, doi: 10.1051/0004-6361/201014247, S2CID 118362423.
- ^ Massarotti, Alessandro; et al. (2008), "Rotational and Radial Velocities for a Sample of 761 Hipparcos giants and the role of binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode: 2008AJ....135..209M, doi: 10.1088/0004-6256/135/1/209.
- ^ "4 Vul". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-04-05.
- ^ 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.
- ^ Kaler, James B., "The Coathanger, A Non-Cluster", Stars, University of Illinois, retrieved 2018-04-07.
- ^ Baumgardt, H. (December 1998), "The nature of some doubtful open clusters as revealed by HIPPARCOS", Astronomy and Astrophysics, 340: 402−414, Bibcode: 1998A&A...340..402B.
- ^ Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal, 539 (2): 732–741, arXiv: astro-ph/0003329, Bibcode: 2000ApJ...539..732A, doi: 10.1086/309278, S2CID 16673121.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vulpecula |
| Right ascension | 19h 25m 28.6030389750s [1] |
| Declination | +19° 47′ 54.059820728″ [1] |
| Apparent magnitude (V) | 5.16 [2] |
| Characteristics | |
| Spectral type | K0 III [2] |
| B−V color index | +0.980 [2] |
| Astrometry | |
| Radial velocity (Rv) | +0.95 ± 0.12 [1] km/s |
| Proper motion (μ) |
RA: +87.392 ± 0.137
[1]
mas/
yr Dec.: -73.038 ± 0.152 [1] mas/ yr |
| Parallax (π) | 12.5320 ± 0.1008 mas [1] |
| Distance | 260 ± 2
ly (79.8 ± 0.6 pc) |
| Absolute magnitude (MV) | +0.54 [3] |
| Details | |
| Mass | 1.72 [2] M☉ |
| Radius | 11.42 [1] R☉ |
| Luminosity | 67.6 [2] L☉ |
| Surface gravity (log g) | 3.01 [4] cgs |
| Temperature | 4,763±26 [2] K |
| Metallicity [Fe/H] | −0.20 [4] dex |
| Rotational velocity (v sin i) | 2.9 [5] km/s |
| Age | 2.63 [2] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
4 Vulpeculae is a single, [7] orange-hued star in the northern constellation of Vulpecula. It forms part of the asterism, formerly thought to be an open cluster, called the coathanger or Brocchi's Cluster. [8] [9] The star is faintly visible to the naked eye with an apparent visual magnitude of 5.16. [2] The distance to this star, based upon an annual parallax shift of 12.5320±0.1008 mas, [1] is around 260 light years.
At the age of about 2.6 billion years old, [2] this is an aging giant star with a stellar classification of K0 III, [2] having exhausted the supply of hydrogen at its core and evolved off the main sequence. It is now a red clump giant, indicating that it is on the horizontal branch and is generating energy through the fusion of helium at its core. [10] The star has an estimated 1.72 [2] times the mass of the Sun and has expanded to 11.42 [1] times the Sun's radius. It is radiating 67.6 [2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,763 K. [2]
- ^ a b c d e f g h i 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.
- ^ a b c d e f g h i j k l m Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv: 1507.01466, Bibcode: 2015AJ....150...88L, doi: 10.1088/0004-6256/150/3/88, S2CID 118505114.
- ^ 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.
- ^ a b Soubiran, C.; et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv: 1004.1069, Bibcode: 2010A&A...515A.111S, doi: 10.1051/0004-6361/201014247, S2CID 118362423.
- ^ Massarotti, Alessandro; et al. (2008), "Rotational and Radial Velocities for a Sample of 761 Hipparcos giants and the role of binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode: 2008AJ....135..209M, doi: 10.1088/0004-6256/135/1/209.
- ^ "4 Vul". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-04-05.
- ^ 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.
- ^ Kaler, James B., "The Coathanger, A Non-Cluster", Stars, University of Illinois, retrieved 2018-04-07.
- ^ Baumgardt, H. (December 1998), "The nature of some doubtful open clusters as revealed by HIPPARCOS", Astronomy and Astrophysics, 340: 402−414, Bibcode: 1998A&A...340..402B.
- ^ Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal, 539 (2): 732–741, arXiv: astro-ph/0003329, Bibcode: 2000ApJ...539..732A, doi: 10.1086/309278, S2CID 16673121.