# CP Boötis

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Star in the constellation Boötes

CP Boötis Observation data Epoch J2000 Equinox J2000 Constellation Boötes Right ascension 14h 33m 20.26330s[1] Declination +36° 57′ 32.4483″[1] Apparent magnitude (V) 6.40[2] Characteristics Evolutionary stage subgiant[3] Spectral type F8 IVw[4] U−B color index 0.07[2] B−V color index 0.51[2] Variable type δ Sct[5] Astrometry Radial velocity (Rv) +5.9[6] km/s Proper motion (μ) RA: +2.694[1] mas/yr Dec.: −73.096[1] mas/yr Parallax (π) 12.9135±0.0244 mas[1] Distance 252.6 ± 0.5 ly (77.4 ± 0.1 pc) Absolute magnitude (MV) 2.05[2] Details Mass 1.77[6] M☉ Luminosity 12.0+1.5 −1.3[7] L☉ Surface gravity (log g) 3.67[6] cgs Temperature 6,276[6] K Metallicity [Fe/H] 0.25[6] dex Rotational velocity (v sin i) 5.7[3] km/s Age 1.70[6] Gyr Other designations CP Boo, AAVSO 1429+37, BD+37°2545, HD 127986, HIP 71168, HR 5441, SAO 64212[8] Database references SIMBAD data

**CP Boötis** is a yellow-white hued [star](/source/Star) in the northern [constellation](/source/Constellation) of [Boötes](/source/Bo%C3%B6tes). With a baseline [apparent visual magnitude](/source/Apparent_visual_magnitude) of 6.40,[2] it is at or near the lower limit for visibility with the typical [naked eye](/source/Naked_eye) in good viewing conditions. The distance to this star can be estimated from its annual [parallax shift](/source/Stellar_parallax) of 12.91 [mas](/source/Milliarcsecond),[1] which yields a range of 252.6 [light years](/source/Light_year). It is moving further away with a heliocentric [radial velocity](/source/Radial_velocity) of +5.9 km/s.[6]

In May of 1977, Michel Auvergne *et al.* inadvertently discovered that the star is a [variable star](/source/Variable_star), when they used it as a comparison star for photometric observations of [gamma Boötis](/source/Gamma_Bo%C3%B6tis).[9] It was given its [variable star designation](/source/Variable_star_designation), CP Boötis, in 1981.[10]

This is an [F-type](/source/F-type_star) [subgiant star](/source/Subgiant_star) with a [stellar classification](/source/Stellar_classification) of F8 IVw,[4] which indicates it has nearly consumed the hydrogen at its core and is now [evolving](/source/Stellar_evolution) into a [giant star](/source/Giant_star). It is a low amplitude [Delta Scuti variable](/source/Delta_Scuti_variable)[11] that varies by 0.02 magnitude.[12] At the age of 1.7[6] billion years it is spinning with a [projected rotational velocity](/source/Projected_rotational_velocity) of 5.7 km/s.[3] The star has 1.77[6] times the [mass of the Sun](/source/Mass_of_the_Sun) and is radiating 12[7] times the [Sun's luminosity](/source/Sun's_luminosity) from its [photosphere](/source/Photosphere) at an [effective temperature](/source/Effective_temperature) of 6,276 K.[6]

## References

1. ^ [***a***](#cite_ref-GaiaDR2_1-0) [***b***](#cite_ref-GaiaDR2_1-1) [***c***](#cite_ref-GaiaDR2_1-2) [***d***](#cite_ref-GaiaDR2_1-3) [***e***](#cite_ref-GaiaDR2_1-4) [***f***](#cite_ref-GaiaDR2_1-5) [Brown, A. G. A.](/source/Anthony_Brown_(scientist)); et al. ([Gaia collaboration](/source/Data_Processing_and_Analysis_Consortium)) (August 2018). ["*Gaia* Data Release 2: Summary of the contents and survey properties"](https://doi.org/10.1051%2F0004-6361%2F201833051). *[Astronomy & Astrophysics](/source/Astronomy_%26_Astrophysics)*. **616**. A1. [arXiv](/source/ArXiv_(identifier)):[1804.09365](https://arxiv.org/abs/1804.09365). [Bibcode](/source/Bibcode_(identifier)):[2018A&A...616A...1G](https://ui.adsabs.harvard.edu/abs/2018A&A...616A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201833051](https://doi.org/10.1051%2F0004-6361%2F201833051).

1. ^ [***a***](#cite_ref-Karatas2006_2-0) [***b***](#cite_ref-Karatas2006_2-1) [***c***](#cite_ref-Karatas2006_2-2) [***d***](#cite_ref-Karatas2006_2-3) [***e***](#cite_ref-Karatas2006_2-4) Karatas, Y.; Schuster, W. J. (October 2006), "Metallicity and absolute magnitude calibrations for UBV photometry", *Monthly Notices of the Royal Astronomical Society*, **371** (4): 1793–1812, [Bibcode](/source/Bibcode_(identifier)):[2006MNRAS.371.1793K](https://ui.adsabs.harvard.edu/abs/2006MNRAS.371.1793K), [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2006.10800.x](https://doi.org/10.1111%2Fj.1365-2966.2006.10800.x).

1. ^ [***a***](#cite_ref-lebre1999_3-0) [***b***](#cite_ref-lebre1999_3-1) [***c***](#cite_ref-lebre1999_3-2) Lèbre, A.; et al. (1999), "Lithium and rotation on the subgiant branch. I. Observations and spectral analysis", *Astronomy and Astrophysics*, **345**: 936, [Bibcode](/source/Bibcode_(identifier)):[1999A&A...345..936L](https://ui.adsabs.harvard.edu/abs/1999A&A...345..936L).

1. ^ [***a***](#cite_ref-Barry1970_4-0) [***b***](#cite_ref-Barry1970_4-1) Barry, Don C. (January 1970), "Spectral classification of A & F stars", *Astrophysical Journal Supplement*, **19**: 281, [Bibcode](/source/Bibcode_(identifier)):[1970ApJS...19..281B](https://ui.adsabs.harvard.edu/abs/1970ApJS...19..281B), [doi](/source/Doi_(identifier)):[10.1086/190209](https://doi.org/10.1086%2F190209)

1. **[^](#cite_ref-gcvs_5-0)** Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017), "General catalogue of variable stars: Version GCVS 5.1", *Astronomy Reports*, **61** (1): 80–88, [Bibcode](/source/Bibcode_(identifier)):[2017ARep...61...80S](https://ui.adsabs.harvard.edu/abs/2017ARep...61...80S), [doi](/source/Doi_(identifier)):[10.1134/S1063772917010085](https://doi.org/10.1134%2FS1063772917010085), [S2CID](/source/S2CID_(identifier)) [125853869](https://api.semanticscholar.org/CorpusID:125853869). See: [CP Boo](http://webviz.u-strasbg.fr/viz-bin/VizieR-S?V*%20CP%20Boo)

1. ^ [***a***](#cite_ref-Casagrande2011_6-0) [***b***](#cite_ref-Casagrande2011_6-1) [***c***](#cite_ref-Casagrande2011_6-2) [***d***](#cite_ref-Casagrande2011_6-3) [***e***](#cite_ref-Casagrande2011_6-4) [***f***](#cite_ref-Casagrande2011_6-5) [***g***](#cite_ref-Casagrande2011_6-6) [***h***](#cite_ref-Casagrande2011_6-7) [***i***](#cite_ref-Casagrande2011_6-8) [***j***](#cite_ref-Casagrande2011_6-9) Casagrande, L.; et al. (June 2011), "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey", *Astronomy and Astrophysics*, **530**: A138, [arXiv](/source/ArXiv_(identifier)):[1103.4651](https://arxiv.org/abs/1103.4651), [Bibcode](/source/Bibcode_(identifier)):[2011A&A...530A.138C](https://ui.adsabs.harvard.edu/abs/2011A&A...530A.138C), [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201016276](https://doi.org/10.1051%2F0004-6361%2F201016276), [S2CID](/source/S2CID_(identifier)) [56118016](https://api.semanticscholar.org/CorpusID:56118016).

1. ^ [***a***](#cite_ref-doNascimento2000_7-0) [***b***](#cite_ref-doNascimento2000_7-1) do Nascimento, J. D. Jr.; et al. (May 2000), "Lithium and rotation on the subgiant branch. II. Theoretical analysis of observations", *Astronomy and Astrophysics*, **357**: 931–937, [arXiv](/source/ArXiv_(identifier)):[astro-ph/0003010](https://arxiv.org/abs/astro-ph/0003010), [Bibcode](/source/Bibcode_(identifier)):[2000A&A...357..931D](https://ui.adsabs.harvard.edu/abs/2000A&A...357..931D).

1. **[^](#cite_ref-SIMBAD_8-0)** ["HD 127986"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+127986). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 23 August 2018.

1. **[^](#cite_ref-Auvergne1977_9-0)** Auvergne, M.; Le Contel, J. M.; Sareyan, J. P.; Valtier, J. C.; Daguillon, J. (November 1977). ["Observations of the Star gamma Bootis and of the New Variable Star HR 5441"](https://ibvs.konkoly.hu/pub/ibvs/1301/1365.pdf) (PDF). *Information Bulletin on Variable Stars*. **1365**. [Bibcode](/source/Bibcode_(identifier)):[1977IBVS.1365....1A](https://ui.adsabs.harvard.edu/abs/1977IBVS.1365....1A). Retrieved 5 December 2024.

1. **[^](#cite_ref-Kholopov1981_10-0)** Kholopov, P. N.; Samus, N. N.; Kukarkina, N. P.; Medvedeva, G. I.; Perova, N. B. (February 1981). ["65th Name-List of Variable Stars"](https://ibvs.konkoly.hu/pub/ibvs/1901/1921.pdf) (PDF). *Information Bulletin on Variable Stars*. **1921**: 1–21. [Bibcode](/source/Bibcode_(identifier)):[1981IBVS.1921....1K](https://ui.adsabs.harvard.edu/abs/1981IBVS.1921....1K). Retrieved 5 December 2024.

1. **[^](#cite_ref-Galeev2012_11-0)** Galeev, A. I.; et al. (November 2012), "Chemical composition of δ Scuti stars: 1. AO CVn, CP Boo, KW Aur", *Astronomy Reports*, **56** (11): 850–866, [Bibcode](/source/Bibcode_(identifier)):[2012ARep...56..850G](https://ui.adsabs.harvard.edu/abs/2012ARep...56..850G), [doi](/source/Doi_(identifier)):[10.1134/S1063772912110029](https://doi.org/10.1134%2FS1063772912110029), [S2CID](/source/S2CID_(identifier)) [124127339](https://api.semanticscholar.org/CorpusID:124127339)

1. **[^](#cite_ref-AAVSOBP_12-0)** Watson, Christopher (January 4, 2010), ["CP Boötis"](http://www.aavso.org/vsx/index.php?view=detail.top&oid=4419), *AAVSO Website*, [American Association of Variable Star Observers](/source/American_Association_of_Variable_Star_Observers), retrieved 3 August 2014.

## External links

- [HR 5441](http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%205441)

v t e Constellation of Boötes Boötes in Chinese astronomy Boötes Void List of stars in Boötes Stars Bayer α (Arcturus) β (Nekkar) γ (Seginus) δ (Qigong) ε (Izar, Pulcherrima) ζ η (Muphrid) θ ι κ λ (Xuange) μ1 (Alkalurops) μ2 ν1 ν2 ξ ο π ρ (Kalasungsang) σ (Genghe) τ (Tepiamenit) υ φ χ ψ ω Flamsteed 1 2 3 6 (e) 7 9 10 11 12 (d) 13 14 15 18 20 22 (f) 24 (g) 26 31 32 33 34 (Alrumh) 38 (Merga) 39 40 44 (Quadrans) 45 (c) 46 (b) 47 (k) 50 Variable R S T RX ZZ AB BL BP BX BY CE CH CI CN CP CR CX CY (101 Vir) DE EK HN HP HD 118508 118889 122563 125040 125351 (A) 125658 126128 126129 126141 126200 126271 127304 127334 127726 128093 128198 129132 129357 130084 130603 130917 131040 131473 131496 (Arcalís) 132029 132406 132563 134064 134335 135438 135530 135944 141399 Other 2MASS J15031961+2525196 CFBDSIR 1458+10 Gliese 526 HAT-P-4 LHS 2924 PSR J1544+4937 SDSS J1416+1348 SDSS J1433+1011 TVLM 513-46546 WASP-14 WD 1425+540 ZTF J153932.16+502738.8 Exoplanets HAT-P-4b HD 128311 b c HD 132406 b HD 136418 b (Awasis) τ Boötis b TOI-1853 b WASP-14b Star clusters NGC 5466 Galaxies NGC 5008 5248 5251 5416 5490 5500 5504 5508 5514 5523 5529 5532 5533 5535 5539 5541 5544 5545 5548 5557 5559 5562 5579 5582 5591 5601 5603 5609 5613 5614 5615 5624 5629 5630 5641 5642 5653 5665 5676 5681 5682 5683 5698 5714 5722 5752 5753 5754 5755 5772 5778 5784 5790 5820 5821 5829 5837 5857 5875 5876 5886 5888 5896 5929 5930 5966 Numbered I II III Other 3C 295 3C 299 3C 300 3C 303 3C 315 4C 19.44 4C +26.42 7C 1354+2552 Abell 2009 BCG Arp 302 B2 1420+32 B2 1441+26 CEERS-2112 CEERS-93316 CEERS2-588 CLASS B1359+154 Cloverleaf quasar DDO 190 EGS-zs8-1 EGS-z11-R0 EGSY8p7 H1426+428 IC 4397 IC 4461 IC 4462 IC 4481 IC 4516 IRAS 13349+2438 IRAS 14394+5332 IRAS 15206+3342 LEDA 2108986 MACS 1423-z7p64 MACS J1447.4+0827 BCG Maisie's Galaxy Markarian 463 Markarian 471 Markarian 478 MS 1455.0+2232 BCG MS 1512-cB58 NVSS J141343+433945 OQ 172 OQ 530 PG 1411+442 PG 1543+489 PGC 93125 PGC 1470080 PKS 1345+125 PKS 1413+135 QSO B1422+202 RBS 1467 RGZ J145001.5+144747 RGZ J145039.8+441829 SBS 1415+437 SDSS J135646.10+102609.0 SDSS J1430+2303 Teacup galaxy UGC 8669 UGC 9128 UGC 9425 UGC 9684 UGC 9796 ULAS J1342+0928 VV 191 Galaxy clusters Abell 1795 Abell 1991 BoRG-58 IDCS J1426.5+3508 Astronomical events GRB 990123 GRB 080319B SCP 06F6 SN 2003fg SN 2005bc SN 2020tlf Category

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Adapted from the Wikipedia article [CP Boötis](https://en.wikipedia.org/wiki/CP_Bo%C3%B6tis) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/CP_Bo%C3%B6tis?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.