# HD 130948

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Star in the constellation Boötes

HD 130948 The visual band light curve of HP Boötes, plotted from data published by Gaidos et al. (2000)[1] Observation data Epoch J2000 Equinox J2000 Constellation Boötes[2] Right ascension 14h 50m 15.8110s[3] Declination +23° 54′ 42.634″[3] Apparent magnitude (V) 5.99[4] Characteristics Evolutionary stage main sequence[3] Spectral type F9 IV-V[5] U−B color index +0.01[6] B−V color index +0.576[4] Variable type BY Dra[7] Astrometry Radial velocity (Rv) −1.5[8] km/s Proper motion (μ) RA: +144.396[3] mas/yr Dec.: +31.661[3] mas/yr Parallax (π) 54.9502±0.0343 mas[3] Distance 59.35 ± 0.04 ly (18.20 ± 0.01 pc) Absolute magnitude (MV) +4.56[2] Details Mass 0.97[9] M☉ Radius 1.1[3] R☉ Luminosity 1.2[3] L☉ Surface gravity (log g) 4.18[9] cgs Temperature 5,780[9] K Metallicity [Fe/H] −0.20[9] dex Rotation 8.1[10] Rotational velocity (v sin i) 6.8[10] km/s Age 4.7[11] or 0.5[12] Gyr Other designations HP Boötis, GJ 564, BD+24°2786, HD 130948, FK5 3172, HIP 72567, HR 5534, SAO 83553[6] Database references SIMBAD data

**HD 130948** or **HP Boötis** is a [variable star](/source/Variable_star) with 2 [brown dwarfs](/source/Brown_dwarf) in the constellation [Boötes](/source/Bo%C3%B6tes). With an [apparent magnitude](/source/Apparent_magnitude) of 6.0, it is faintly visible to the [naked eye](/source/Naked_eye) under very good observing conditions. It has a [stellar classification](/source/Stellar_classification) of G1V, which means it is a [main sequence](/source/Main_sequence) star with a mass and surface temperature that are similar to the [Sun](/source/Sun).

The estimated age of HD 130948 is similar to the Sun at 4.7 billion years (Gyr) old, but it has a lower proportion of elements (63%) other than hydrogen or helium. However, a separate study in 2009 gave a much younger age of 0.5±0.3 [Gyr](/source/Billion_years) and a higher [metallicity](/source/Metallicity) that is very similar to the Sun.[12] [Evolutionary](/source/Stellar_evolution) models suggest that it is just reaching the end of its [main sequence](/source/Main_sequence) life.[3]

Eric J. Gaidos *et al.* observed the star in 1998 and 1999, and discovered that it is a [variable star](/source/Variable_star).[13] It was given its [variable star designation](/source/Variable_star_designation), HP Boötis, in 2006.[7]

In 2002, a pair of [co-orbiting](/source/Co-orbiting) [brown dwarfs](/source/Brown_dwarf) were discovered in orbit around this star. They were found using an adaptive optics instrument on the [Gemini North](/source/Gemini_Observatory) 8m telescope in Hawaii.[14] The pair have a 10-year orbital period about the primary star, and their combined mass is 10.9% of the Sun's mass.[12]

The [space velocity](/source/Space_velocity_(astronomy)) components of this star through the [Milky Way](/source/Milky_Way) galaxy are (U, V, W) = (−14.0, 14.7, −0.1).[9]

## References

1. **[^](#cite_ref-Gaidos_1-0)** Gaidos, E. J.; Henry, G. W.; Henry, S. M. (August 2000). ["Spectroscopy and Photometry of Nearby Young Solar Analogs"](https://doi.org/10.1086%2F301488). *The Astronomical Journal*. **120** (2): 1006–1013. [Bibcode](/source/Bibcode_(identifier)):[2000AJ....120.1006G](https://ui.adsabs.harvard.edu/abs/2000AJ....120.1006G). [doi](/source/Doi_(identifier)):[10.1086/301488](https://doi.org/10.1086%2F301488). [S2CID](/source/S2CID_(identifier)) [16930014](https://api.semanticscholar.org/CorpusID:16930014).

1. ^ [***a***](#cite_ref-xhip_2-0) [***b***](#cite_ref-xhip_2-1) Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". *Astronomy Letters*. **38** (5): 331. [arXiv](/source/ArXiv_(identifier)):[1108.4971](https://arxiv.org/abs/1108.4971). [Bibcode](/source/Bibcode_(identifier)):[2012AstL...38..331A](https://ui.adsabs.harvard.edu/abs/2012AstL...38..331A). [doi](/source/Doi_(identifier)):[10.1134/S1063773712050015](https://doi.org/10.1134%2FS1063773712050015).

1. ^ [***a***](#cite_ref-dr3_3-0) [***b***](#cite_ref-dr3_3-1) [***c***](#cite_ref-dr3_3-2) [***d***](#cite_ref-dr3_3-3) [***e***](#cite_ref-dr3_3-4) [***f***](#cite_ref-dr3_3-5) [***g***](#cite_ref-dr3_3-6) [***h***](#cite_ref-dr3_3-7) [***i***](#cite_ref-dr3_3-8) Vallenari, A.; et al. (Gaia collaboration) (2023). ["*Gaia* Data Release 3. Summary of the content and survey properties"](https://doi.org/10.1051%2F0004-6361%2F202243940). *Astronomy and Astrophysics*. **674**: A1. [arXiv](/source/ArXiv_(identifier)):[2208.00211](https://arxiv.org/abs/2208.00211). [Bibcode](/source/Bibcode_(identifier)):[2023A&A...674A...1G](https://ui.adsabs.harvard.edu/abs/2023A&A...674A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202243940](https://doi.org/10.1051%2F0004-6361%2F202243940). [S2CID](/source/S2CID_(identifier)) [244398875](https://api.semanticscholar.org/CorpusID:244398875). [Gaia DR3 record for this source](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-source=+I%2F355&-from=nav&-nav=cat%3AI%2F355%26tab%3A%7BI%2F355%2Fgaiadr3%7D%26key%3Asource%3D1355%2Fgaiadr3%26HTTPPRM%3A%26-out.add%3D.%26Source%3D%3D%3D1265976524286377856%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-aaa474_2_653_4-0) [***b***](#cite_ref-aaa474_2_653_4-1) van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". *Astronomy and Astrophysics*. **474** (2): 653–664. [arXiv](/source/ArXiv_(identifier)):[0708.1752](https://arxiv.org/abs/0708.1752). [Bibcode](/source/Bibcode_(identifier)):[2007A&A...474..653V](https://ui.adsabs.harvard.edu/abs/2007A&A...474..653V). [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20078357](https://doi.org/10.1051%2F0004-6361%3A20078357). [S2CID](/source/S2CID_(identifier)) [18759600](https://api.semanticscholar.org/CorpusID:18759600).

1. **[^](#cite_ref-gray2001_5-0)** Gray, R. O.; Napier, M. G.; Winkler, L. I. (2001). "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars". *The Astronomical Journal*. **121** (4): 2148. [Bibcode](/source/Bibcode_(identifier)):[2001AJ....121.2148G](https://ui.adsabs.harvard.edu/abs/2001AJ....121.2148G). [doi](/source/Doi_(identifier)):[10.1086/319956](https://doi.org/10.1086%2F319956).

1. ^ [***a***](#cite_ref-simbad_6-0) [***b***](#cite_ref-simbad_6-1) ["V* HP Boo -- Variable of BY Dra type"](http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+130948). *SIMBAD*. [Centre de Données astronomiques de Strasbourg](/source/Centre_de_Donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2010-10-03.

1. ^ [***a***](#cite_ref-Kazarovets2006_7-0) [***b***](#cite_ref-Kazarovets2006_7-1) Kazarovets, E. V.; Samus, N. N.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (August 2006). ["The 78th Name-List of Variable Stars"](https://ibvs.konkoly.hu/pub/ibvs/5701/5721.pdf) (PDF). *Information Bulletin on Variable Stars*. **5721**: 1–45. [Bibcode](/source/Bibcode_(identifier)):[2006IBVS.5721....1K](https://ui.adsabs.harvard.edu/abs/2006IBVS.5721....1K). Retrieved 6 December 2024.

1. **[^](#cite_ref-rgcrv_8-0)** Evans, D. S. (June 20–24, 1966). "The Revision of the General Catalogue of Radial Velocities". In Batten, Alan Henry; Heard, John Frederick (eds.). *Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30*. University of Toronto: [International Astronomical Union](/source/International_Astronomical_Union). [Bibcode](/source/Bibcode_(identifier)):[1967IAUS...30...57E](https://ui.adsabs.harvard.edu/abs/1967IAUS...30...57E).

1. ^ [***a***](#cite_ref-aaas141_491_9-0) [***b***](#cite_ref-aaas141_491_9-1) [***c***](#cite_ref-aaas141_491_9-2) [***d***](#cite_ref-aaas141_491_9-3) [***e***](#cite_ref-aaas141_491_9-4) Chen, Y. Q.; Nissen, P. E.; Zhao, G.; Zhang, H. W.; Benoni, T. (February 2000). "Chemical composition of 90 F and G disk dwarfs". *Astronomy and Astrophysics Supplement*. **141** (3): 491–506. [arXiv](/source/ArXiv_(identifier)):[astro-ph/9912342](https://arxiv.org/abs/astro-ph/9912342). [Bibcode](/source/Bibcode_(identifier)):[2000A&AS..141..491C](https://ui.adsabs.harvard.edu/abs/2000A&AS..141..491C). [doi](/source/Doi_(identifier)):[10.1051/aas:2000124](https://doi.org/10.1051%2Faas%3A2000124). [S2CID](/source/S2CID_(identifier)) [16273589](https://api.semanticscholar.org/CorpusID:16273589).

1. ^ [***a***](#cite_ref-bowler2023_10-0) [***b***](#cite_ref-bowler2023_10-1) Bowler, Brendan P.; Tran, Quang H.; Zhang, Zhoujian; Morgan, Marvin; Ashok, Katelyn B.; Blunt, Sarah; Bryan, Marta L.; Evans, Analis E.; Franson, Kyle; Huber, Daniel; Nagpal, Vighnesh; Wu, Ya-Lin; Zhou, Yifan (2023). ["Rotation Periods, Inclinations, and Obliquities of Cool Stars Hosting Directly Imaged Substellar Companions: Spin-Orbit Misalignments Are Common"](https://doi.org/10.3847%2F1538-3881%2Facbd34). *The Astronomical Journal*. **165** (4): 164. [arXiv](/source/ArXiv_(identifier)):[2301.04692](https://arxiv.org/abs/2301.04692). [Bibcode](/source/Bibcode_(identifier)):[2023AJ....165..164B](https://ui.adsabs.harvard.edu/abs/2023AJ....165..164B). [doi](/source/Doi_(identifier)):[10.3847/1538-3881/acbd34](https://doi.org/10.3847%2F1538-3881%2Facbd34).

1. **[^](#cite_ref-aaa501_3_941_11-0)** Holmberg, J.; Nordstrom, B.; Andersen, J. (July 2009). "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics". *Astronomy and Astrophysics*. **501** (3): 941–947. [arXiv](/source/ArXiv_(identifier)):[0811.3982](https://arxiv.org/abs/0811.3982). [Bibcode](/source/Bibcode_(identifier)):[2009A&A...501..941H](https://ui.adsabs.harvard.edu/abs/2009A&A...501..941H). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/200811191](https://doi.org/10.1051%2F0004-6361%2F200811191). [S2CID](/source/S2CID_(identifier)) [118577511](https://api.semanticscholar.org/CorpusID:118577511).

1. ^ [***a***](#cite_ref-apj692_1_729_12-0) [***b***](#cite_ref-apj692_1_729_12-1) [***c***](#cite_ref-apj692_1_729_12-2) Dupuy, Trent J.; Liu, Michael C.; Ireland, Michael J. (February 2009). "Dynamical Mass of the Substellar Benchmark Binary HD 130948BC". *The Astrophysical Journal*. **692** (1): 729–752. [arXiv](/source/ArXiv_(identifier)):[0807.2450](https://arxiv.org/abs/0807.2450). [Bibcode](/source/Bibcode_(identifier)):[2009ApJ...692..729D](https://ui.adsabs.harvard.edu/abs/2009ApJ...692..729D). [doi](/source/Doi_(identifier)):[10.1088/0004-637X/692/1/729](https://doi.org/10.1088%2F0004-637X%2F692%2F1%2F729). [S2CID](/source/S2CID_(identifier)) [119237470](https://api.semanticscholar.org/CorpusID:119237470).

1. **[^](#cite_ref-Gaidos2000_13-0)** Gaidos, E. J.; Henry, G. W.; Henry, S. M. (August 2000). "Spectroscopy and Photometry of Nearby Young Solar Analogs". *The Astronomical Journal*. **120** (2): 1006–1013. [Bibcode](/source/Bibcode_(identifier)):[2000AJ....120.1006G](https://ui.adsabs.harvard.edu/abs/2000AJ....120.1006G). [doi](/source/Doi_(identifier)):[10.1086/301488](https://doi.org/10.1086%2F301488).

1. **[^](#cite_ref-apj567_2_L133_14-0)** Potter, Daniel; Martín, Eduardo L.; Cushing, Michael C.; Baudoz, Pierre; Brandner, Wolfgang; Guyon, Olivier; Neuhäuser, Ralph (March 2002). "Hokupa'a-Gemini Discovery of Two Ultracool Companions to the Young Star HD 130948". *The Astrophysical Journal*. **567** (2): L133–L136. [arXiv](/source/ArXiv_(identifier)):[astro-ph/0201431](https://arxiv.org/abs/astro-ph/0201431). [Bibcode](/source/Bibcode_(identifier)):[2002ApJ...567L.133P](https://ui.adsabs.harvard.edu/abs/2002ApJ...567L.133P). [doi](/source/Doi_(identifier)):[10.1086/339999](https://doi.org/10.1086%2F339999). [S2CID](/source/S2CID_(identifier)) [16249194](https://api.semanticscholar.org/CorpusID:16249194).

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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