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2MASS J01225093−2439505 is a M-type main-sequence star. Its surface temperature is 3530±50 K. 2MASS J01225093−2439505 is much younger than the Sun at an age of 0.12 billion years. Kinematically, the star belongs to the AB Doradus moving group.

Multiplicity surveys did not detect any stellar companions to 2MASS J01225093−2439505 as of 2016.

Planetary system

In 2013, one superjovian planet (may be a brown dwarf), named 2MASS J01225093−2439505 b, was discovered by direct imaging. The measured planetary temperature is 1600±100 K, and it exhibits an unusual, short-lived atmospheric dust type due to its relatively low surface gravity and young age. The planetary spectrum is classified as L3.7±1.0. The planetary rotation axis is inclined to its orbit, obliquity is 33
₋₉°, while the orbit is well aligned with the equatorial plane of the star, misalignment is 1
₋₁°. The planet is rotating rapidly, with a period of 6.8±1.8 hours.

References

1. ^ "LEHPM 1481". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-02-08.
2. ^ Bowler, Brendan P.; Liu, Michael C.; Shkolnik, Evgenya L.; Dupuy, Trent J. (2013). "Planets Around Low-Mass Stars. III. A Young Dusty L Dwarf Companion at the Deuterium-Burning Limit". The Astrophysical Journal. 774 (1): 55. arXiv:1307.2237. Bibcode:2013ApJ...774...55B. doi:10.1088/0004-637X/774/1/55. S2CID 119107288.
3. ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
4. ^ Hinkley, Sasha; Bowler, Brendan P.; Vigan, Arthur; Aller, Kimberly M.; Liu, Michael C.; Mawet, Dimitri; Matthews, Elisabeth; Wahhaj, Zahed; Kraus, Stefan; Baraffe, Isabelle; Chabrier, Gilles (2015). "Early Results from VLT Sphere: Long-Slit Spectroscopy of 2Mass 0122–2439 B, A Young Companion Near the Deuterium Burning Limit". The Astrophysical Journal. 805 (1): L10. arXiv:1504.07240. Bibcode:2015ApJ...805L..10H. doi:10.1088/2041-8205/805/1/L10. S2CID 20992122.
5. ^ Bryan, Marta L.; Chiang, Eugene; Bowler, Brendan P.; Morley, Caroline V.; Millholland, Sarah; Blunt, Sarah; Ashok, Katelyn B.; Nielsen, Eric; Ngo, Henry; Mawet, Dimitri; Knutson, Heather A. (2020). "Obliquity Constraints on an Extrasolar Planetary-mass Companion". The Astronomical Journal. 159 (4): 181. arXiv:2002.11131. Bibcode:2020AJ....159..181B. doi:10.3847/1538-3881/ab76c6. S2CID 211505793.
6. Zhou, Yifan; Apai, Dániel; Lew, Ben W. P.; Schneider, Glenn; Manjavacas, Elena; Bedin, Luigi R.; Cowan, Nicolas B.; Marley, Mark S.; Radigan, Jacqueline; Karalidi, Theodora; Lowrance, Patrick J.; Miles-Páez, Paulo A.; Metchev, Stanimir; Burgasser, Adam J. (2019). "Cloud Atlas: High-contrast Time-resolved Observations of Planetary-mass Companions". The Astronomical Journal. 157 (3): 128. arXiv:1902.00085. Bibcode:2019AJ....157..128Z. doi:10.3847/1538-3881/ab037f. S2CID 119074052.
7. Bryan, Marta L.; Bowler, Brendan P.; Knutson, Heather A.; Kraus, Adam L.; Hinkley, Sasha; Mawet, Dimitri; Nielsen, Eric L.; Blunt, Sarah C. (2016). "Searching for Scatterers: High-Contrast Imaging of Young Stars Hosting Wide-Separation Planetary-Mass Companions". The Astrophysical Journal. 827 (2): 100. arXiv:1606.06744. Bibcode:2016ApJ...827..100B. doi:10.3847/0004-637X/827/2/100. S2CID 8681056.

v t e Constellation of Cetus
List of stars in Cetus Cetus in Chinese astronomy
Stars	Bayer α (Menkar) β (Diphda) γ (Kaffaljidhma) δ ε ζ (Baten Kaitos) η θ ι κ κ λ μ ν ξ ξ ο (Mira) A B π ρ σ τ υ φ φ φ φ χ Flamsteed 1 2 3 6 7 9 13 14 20 46 49 56 (υ) 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 77 102 107 113 114 116 117 118 120 124 132 135 142 143 144 145 151 154 155 157 161 163 165 166 167 168 170 171 172 173 177 178 179 187 191 192 195 196 197 201 207 209 210 216 217 219 223 227 230 232 235 237 239 244 245 247 255 259 263 268 270 271 273 274 275 276 277 279 283 284 285 286 291 293 297 298 301 303 307 309 320 321 325 327 329 331 333 335 336 337 340 341 342 343 344 345 347 349 350 351 352 353 355 356 357 359 363 364 367 369 377 391 413 417 426 428 429 430 435 442 445 448 450 478 480 481 487 493 497 519 521 533 540 541 545 547 554 555 560 570 584 585 596 615 622 655 681 682 690 701 720 747 755 779 800 806 833 838 864 874 880 895 908 936 945 950 960 965 966 985 988 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
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