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Phi4 Ceti - Wikipedia

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Phi⁴ Ceti
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Cetus
Right ascension	00^h 58^m 43.86805^s^[1]
Declination	−11° 22′ 47.9107″^[1]
Apparent magnitude (V)	5.61^[2]
Characteristics
Evolutionary stage	Horizontal branch^[3]
Spectral type	G8 III^[4]
B−V color index	+0.94^[2]
Astrometry

Radial velocity (R_v)	−19.32±0.13^[1] km/s
Proper motion (μ)	RA: −32.898 mas/yr^[1] Dec.: −14.466 mas/yr^[1]
Parallax (π)	9.7501 ± 0.0666 mas^[1]
Distance	335 ± 2 ly (102.6 ± 0.7 pc)
Absolute magnitude (M_V)	0.696^[3]

Details

Mass	1.53±0.04^[5] `M`_☉
Radius	10.972±0.224^[6] `R`_☉
Luminosity	63.2±1.3^[6] `L`_☉
Surface gravity (log g)	2.60±0.06^[6] cgs
Temperature	4,914±50^[6] K
Metallicity [Fe/H]	−0.17±0.03^[7] dex
Rotational velocity (v sin i)	0.83±0.48^[7] km/s
Age	2.20±0.04^[5] Gyr

Other designations
φ⁴ Cet, 23 Cet, BD−12°173, HD 5722, HIP 4587, HR 279, SAO 147546^[8]
Database references
SIMBAD	data

Phi⁴ Ceti is a solitary,^[9] orange-hued star in the equatorial constellation Cetus. It is faintly visible to the naked eye with an apparent visual magnitude of 5.61.^[2] Based upon an annual parallax shift of 9.76 mas as seen from Earth, it is located approximately 334 light years from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.10 due to interstellar dust,^[7] giving it an absolute magnitude of 0.70.^[3] It is drifting closer with a radial velocity of −19 km/s.^[7]

This is an evolved G-type giant star with a stellar classification of G8 III.^[4] At the estimated age of 2.2 billion years,^[5] is a red clump giant on the horizontal branch, which indicates it is generating energy through helium fusion at its core.^[3] The star has 1.53 times the mass of the Sun^[5] and has expanded to 11 times the Sun's radius. It is radiating 63 times the solar luminosity from its photosphere at an effective temperature of 4,914 K.^[6]

References

^ ^a ^b ^c ^d ^e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ ^a ^b ^c Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa, 27: 11, Bibcode:1968MNSSA..27...11C.
^ ^a ^b ^c ^d Liu, Y. J.; et al. (2007), "The abundances of nearby red clump giants", Monthly Notices of the Royal Astronomical Society, 382 (2): 553–66, Bibcode:2007MNRAS.382..553L, doi:10.1111/j.1365-2966.2007.11852.x.
^ ^a ^b Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, 5, Ann Arbor, Michigan: Department of Astronomy, University of Michigan, Bibcode:1999MSS...C05....0H.
^ ^a ^b ^c ^d Gallenne, A.; Pietrzyński, G.; Graczyk, D.; Nardetto, N.; Mérand, A.; Kervella, P.; Gieren, W.; Villanova, S.; Mennickent, R. E.; Pilecki, B. (2018-08-01), "Fundamental properties of red-clump stars from long-baseline H-band interferometry", Astronomy & Astrophysics, 616: A68, arXiv:1806.09572, Bibcode:2018A&A...616A..68G, doi:10.1051/0004-6361/201833341, ISSN 0004-6361
^ ^a ^b ^c ^d ^e Soubiran, C.; Creevey, O. L.; Lagarde, N.; Brouillet, N.; Jofré, P.; Casamiquela, L.; Heiter, U.; Aguilera-Gómez, C.; Vitali, S.; Worley, C.; de Brito Silva, D. (2024-02-01), "Gaia FGK benchmark stars: Fundamental Teff and log g of the third version", Astronomy and Astrophysics, 682: A145, arXiv:2310.11302, Bibcode:2024A&A...682A.145S, doi:10.1051/0004-6361/202347136, ISSN 0004-6361 Phi4 Ceti's database entry at VizieR.
^ ^a ^b ^c ^d Jofré, E.; et al. (2015), "Stellar parameters and chemical abundances of 223 evolved stars with and without planets", Astronomy & Astrophysics, 574: A50, arXiv:1410.6422, Bibcode:2015A&A...574A..50J, doi:10.1051/0004-6361/201424474, S2CID 53666931, A50.
^ "phi04 Cet". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-04-22.
^ 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.

Constellation of Cetus

Stars

Bayer	α (Menkar) β (Diphda) γ (Kaffaljidhma) δ ε ζ (Baten Kaitos) η θ ι κ¹ κ² λ μ ν ξ¹ ξ² ο (Mira) A B π ρ σ τ υ φ¹ φ² φ³ φ⁴ χ
Flamsteed	1 2 3 6 7 9 13 14 20 46 49 56 (υ¹) 63 64 69 75 77 79 81 84 94 25 Ari
Variable	T UV YZ ZZ AY BL BW DK
HR	10 72 159 228 500 672 870
HD	984 1690 2638 4747 5319 6718 7449 11506 11964 15115 16008 224693 (Axólotl)
Other	2MASS J01225093−2439505 BD-07 436 BD−17 63 (Felixvarela) Cayrel's Star CFBDS J005910.90–011401.3 DENIS-P J020529.0−115925 GD 40 Gliese 65 Gliese 105 GJ 1002 GJ 1005 HIP 5158 HIP 11952 LHS 1140 NGC 156 NGC 158 NGC 302 NGC 308 NGC 310 PSR J0108−1431 SDSS J001820.5−093939.2 SDSS J0106−1000 ULAS J003402.77−005206.7 WD J2356−209 WASP-20 WASP-26 WASP-44 WASP-71 (Mpingo) WISE J0254+0223 WHL0137-LS

Exoplanets	79 Ceti b 81 Ceti b 94 Ceti b BD−17 63 b HD 1461 b HD 2638 b HD 5319 b HD 11506 b c HD 11964 b c HD 224693 b HIP 5158 b c HIP 11915 b τ Ceti e f

Nebulae	NGC 246

Galaxies

Messier	77
NGC	17 35 45 47 50 54 59 61 62 64 65 66 73 77 102 107 113 114 116 117 118 120 124 132 135 142 143 144 145 151 154 155 157 161 163 165 166 167 168 170 171 172 173 177 178 179 187 191 192 195 196 197 201 207 209 210 216 217 219 223 227 230 232 235 237 239 244 245 247 255 259 263 268 270 271 273 274 275 276 277 279 283 284 285 286 291 293 297 298 301 303 307 309 320 321 325 327 329 331 333 335 336 337 340 341 342 343 344 345 347 349 350 351 352 353 355 356 357 359 363 364 367 369 377 391 413 417 426 428 429 430 435 442 445 448 450 478 480 481 487 493 497 519 521 533 540 541 545 547 555 560 570 578 584 585 596 615 622 655 681 682 690 701 720 747 755 779 800 806 833 838 864 874 880 895 908 936 945 950 960 965 966 985 988 1009 1015 1019 1022 1032 1042 1052 1055 1073 1087 1090 1128 1142 1153 1218 7808 7828 7829
Other	Arp 146 Arp 147 Arp 256 3C 75 Cetus Dwarf HCM-6A HD2 Holmberg 15A HXMM01 IC 1613 IC 1623 IRAS 01003-2238 Markarian 1014 Markarian 1018 MCG -03-04-014 PGC 2456 SDSS J0303-0019 SXDF-NB1006-2 9Spitch TON S180 UGC 711 UGC 1775 Wolf–Lundmark–Melotte

Galaxy clusters	Abell 133 Abell 222 Abell 223 Abell 370 Abell 400 Arp 251 Gioiello IRC 0218 JKCS 041

Astronomical events	SN 2005E SN 2005gj