20 Boötis
20 Boötis
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
Constellation | Boötes |
Right ascension | 14h 19m 45.23479s[1] |
Declination | +16° 18′ 25.0136″[1] |
Apparent magnitude (V) | 4.85 |
| Characteristics | |
Spectral type | K3 III |
| U−B color index | 1.4 |
| B−V color index | 1.23 |
| R−I color index | 0.6 |
| Astrometry | |
| Radial velocity (Rv) | –7.64 km/s |
| Proper motion (μ) | RA: –141.56[1] mas/yr Dec.: +60.48[1] mas/yr |
| Parallax (π) | 17.44 ± 0.22[1] mas |
| Distance | 187 ± 2 ly (57.3 ± 0.7 pc) |
| Absolute magnitude (MV) | 1.01 ± 0.09[2] |
| Details | |
| Mass | 1.14 ± 0.19[2] M☉ |
| Radius | 11.3 ± 0.5[2] R☉ |
| Surface gravity (log g) | 2.36 ± 0.08[2] cgs |
| Temperature | 4,472[2] K |
Metallicity [Fe/H] | 0.16[2] dex |
| Rotation | 848 days[3] |
| Rotational velocity (v sin i) | 1.0[3] km/s |
| Age | 5.21 ± 2.28[2] Gyr |
| Other designations | |
HR 5370, HD 125560, BD+16°2637, FK5 3135, HIP 70027, SAO 100980, GC 19334. | |
| Database references | |
| SIMBAD | data |
20 Boötis is a star in the constellation Boötes.
20 Boötis is an orange K-type giant with an apparent magnitude of +4.85. It is approximately 187 light years from Earth.
References[edit]
^ abcde 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.mw-parser-output cite.citation{font-style:inherit}.mw-parser-output q{quotes:"""""""'""'"}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}
^ abcdefg da Silva, L.; et al. (November 2006), "Basic physical parameters of a selected sample of evolved stars", Astronomy and Astrophysics, 458 (2): 609–623, arXiv:astro-ph/0608160, Bibcode:2006A&A...458..609D, doi:10.1051/0004-6361:20065105
^ ab Setiawan, J.; et al. (July 2004), "Precise radial velocity measurements of G and K giants. Multiple systems and variability trend along the Red Giant Branch", Astronomy and Astrophysics, 421: 241–254, Bibcode:2004A&A...421..241S, doi:10.1051/0004-6361:20041042-1
External links[edit]
- HR 5370
- Image 20 Boötis
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Categories:
- Henry Draper Catalogue objects
- Hipparcos objects
- Flamsteed objects
- Boötes
- K-type giants
- HR objects
- Durchmusterung objects
- Giant-star stubs
- Variable star stubs
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