# 2MASS 1237+6526

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/2MASS_1237%2B6526
> Markdown URL: https://mediated.wiki/source/2MASS_1237%2B6526.md
> Source: https://en.wikipedia.org/wiki/2MASS_1237%2B6526
> Source revision: 1347761335
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

Brown dwarf in the constellation Draco

2MASS 1237+6526 T-type brown dwarf 2MASS 1237+6526 (faint red "star" in the center) imaged by legacy surveys Observation data Epoch J2000 Equinox J2000 Constellation Draco Right ascension 12h 37m 39.19632s[1] Declination +65° 26′ 14.8092″[1] Apparent magnitude (V) +16.05 Characteristics Spectral type T6.5[2] Astrometry Parallax (π) 96.07±4.78 mas[3] Distance 34 ± 2 ly (10.4 ± 0.5 pc) Details Mass 0.035 M☉ Radius 0.11 R☉ Luminosity 6.25×10−6 L☉ Temperature 850[4] K Age ≥2-10[4] billion years Other designations 2MASS J12373919+6526148, 2MASSI J1237392+652615, 2MASSW J1237392+652615 Database references SIMBAD data

**2MASS J12373919+6526148** (hereafter **2MASS 1237+6526**) is a [brown dwarf](/source/Brown_dwarf) object with late [spectral type T](/source/T_dwarf) in the constellation of [Draco](/source/Draco_(constellation)), nearly 34 [light-years](/source/Light-year) away from the Sun.[3] The substellar object could likely host a very low-mass companion (yet undetected but inferred), possibly in the planetary regime.[2] This has been inferred from unusual [Hα](/source/H-alpha) emission that it exhibited in the past.[5]

Radio observations with the [Very Large Array](/source/Very_Large_Array) detected the brown dwarf. The strong detection is due to weakly circularly polarized (~35%) quiescent emission as well as pulsed emission, including a strong pulse that was highly circularly polarized (~80%). Two weaker pulses occurred before and after this strong pulse. This constrained the rotation period to 2.28+0.10 −0.09 h.[6] 2MASS 1237+6526 may potentially show [aurorae](/source/Aurora), which would be significant since extrasolar aurorae have not been detected, but this has not been conclusively demonstrated.[5]

## Possible planetary companion

This section needs to be updated. The reason given is: There are more recent papers discussing the possibility of a companion (already cited elsewhere in the article). Please help update this article to reflect recent events or newly available information. (January 2026)

Burgasser et al. (2003)[2] have inferred the presence of a low-mass companion orbiting the brown dwarf 2MASS 1237+6526. Such object would yield a mass between 3 and 12 times that of [Jupiter](/source/Jupiter) and take nearly 4.56 hours (0.19 days) to revolve around its dim primary. If confirmed it would be one of the shortest period [exoplanets](/source/Exoplanet) and orbiting one of the faintest hosts so far. Accounting very faint luminosity of the primary (6.25/1,000,000th of Sun's luminosity), the habitable zone is located within 0.0025 [astronomical units](/source/Astronomical_unit), so the putative planet could likely retain great amounts of [water](/source/Water) and [ammonia](/source/Ammonia). Moreover, both the objects would appear the same size.

The 2MASS 1237+6526 planetary system[2] Companion (in order from star) Mass Semimajor axis (AU) Orbital period (days) Eccentricity Inclination (°) Radius b (unconfirmed) ≥3-12 MJ ≤0.003 ≥0.19 0? — —

## See also

Other T-dwarfs with detected radio emission:

- [SIMP J013656.5+093347.3](/source/SIMP_J013656.5%2B093347.3) T2.5, planetary-mass object

- [2MASS J10475385+2124234](/source/2MASS_J10475385%2B2124234) T6.5

- [WISEPC J112254.73+255021.5](/source/WISEPC_J112254.73%2B255021.5) T6

- [WISEPA J101905.63+652954.2](/source/WISEPA_J101905.63%2B652954.2) T5.5+T7.0

- [WISEPA J062309.94-045624.6](/source/WISEPA_J062309.94-045624.6) T8

- [2MASS 2228-4310](/source/2MASS_J22282889%E2%88%924310262) T6

## References

1. ^ [***a***](#cite_ref-2MASS_1-0) [***b***](#cite_ref-2MASS_1-1) Cutri, R. M. (2003). "2MASS All-Sky Catalog of Point Sources". *VizieR On-line Data Catalog*. [Bibcode](/source/Bibcode_(identifier)):[2003yCat.2246....0C](https://ui.adsabs.harvard.edu/abs/2003yCat.2246....0C).

1. ^ [***a***](#cite_ref-Burgasser_et_al._2-0) [***b***](#cite_ref-Burgasser_et_al._2-1) [***c***](#cite_ref-Burgasser_et_al._2-2) [***d***](#cite_ref-Burgasser_et_al._2-3) Burgasser; et al. (2003). "Binarity in Brown Dwarfs: T Dwarf Binaries Discovered with the Hubble Space Telescope WPFC2". *[The Astrophysical Journal](/source/The_Astrophysical_Journal)*. **586** (1): 512–526. [arXiv](/source/ArXiv_(identifier)):[astro-ph/0211470](https://arxiv.org/abs/astro-ph/0211470). [Bibcode](/source/Bibcode_(identifier)):[2003ApJ...586..512B](https://ui.adsabs.harvard.edu/abs/2003ApJ...586..512B). [doi](/source/Doi_(identifier)):[10.1086/346263](https://doi.org/10.1086%2F346263). [S2CID](/source/S2CID_(identifier)) [6682945](https://api.semanticscholar.org/CorpusID:6682945).

1. ^ [***a***](#cite_ref-BDKP_3-0) [***b***](#cite_ref-BDKP_3-1) Faherty, Jacqueline K. (2012). "The Brown Dwarf Kinematics Project (BDKP). III. Parallaxes for 70 Ultracool Dwarfs". *The Astrophysical Journal*. **752** (1): 56. [arXiv](/source/ArXiv_(identifier)):[1203.5543](https://arxiv.org/abs/1203.5543). [Bibcode](/source/Bibcode_(identifier)):[2012ApJ...752...56F](https://ui.adsabs.harvard.edu/abs/2012ApJ...752...56F). [doi](/source/Doi_(identifier)):[10.1088/0004-637X/752/1/56](https://doi.org/10.1088%2F0004-637X%2F752%2F1%2F56). [S2CID](/source/S2CID_(identifier)) [18160586](https://api.semanticscholar.org/CorpusID:18160586).

1. ^ [***a***](#cite_ref-Liebert_&_Burgasser_4-0) [***b***](#cite_ref-Liebert_&_Burgasser_4-1) Liebert & Burgasser (2007). "On the Nature of the Unique Hα-emitting T Dwarf 2MASS J12373919+6526148". *[Astronomy & Astrophysics](/source/Astronomy_%26_Astrophysics)*. **655** (1): 522–527. [arXiv](/source/ArXiv_(identifier)):[astro-ph/0609793](https://arxiv.org/abs/astro-ph/0609793). [Bibcode](/source/Bibcode_(identifier)):[2007ApJ...655..522L](https://ui.adsabs.harvard.edu/abs/2007ApJ...655..522L). [doi](/source/Doi_(identifier)):[10.1086/509882](https://doi.org/10.1086%2F509882). [S2CID](/source/S2CID_(identifier)) [18852560](https://api.semanticscholar.org/CorpusID:18852560).

1. ^ [***a***](#cite_ref-Saur_5-0) [***b***](#cite_ref-Saur_5-1) Saur, Joachim; Willmes, Clarissa; Fischer, Christian; Wennmacher, Alexandre; Roth, Lorenz; Youngblood, Allison; Strobel, Darrell F.; Reiners, Ansgar (2021). "Brown dwarfs as ideal candidates for detecting UV aurora outside the Solar System: Hubble Space Telescope observations of 2MASS J1237+6526". *Astronomy & Astrophysics*. **655**: A75. [arXiv](/source/ArXiv_(identifier)):[2109.00827](https://arxiv.org/abs/2109.00827). [Bibcode](/source/Bibcode_(identifier)):[2021A&A...655A..75S](https://ui.adsabs.harvard.edu/abs/2021A&A...655A..75S). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202040230](https://doi.org/10.1051%2F0004-6361%2F202040230). [S2CID](/source/S2CID_(identifier)) [237385895](https://api.semanticscholar.org/CorpusID:237385895).

1. **[^](#cite_ref-6)** Kao, Melodie M.; Hallinan, Gregg; Pineda, J. Sebastian; Stevenson, David; Burgasser, Adam (2018-07-31). ["The Strongest Magnetic Fields on the Coolest Brown Dwarfs"](https://doi.org/10.3847%2F1538-4365%2Faac2d5). *The Astrophysical Journal Supplement Series*. **237** (2): 25. [arXiv](/source/ArXiv_(identifier)):[1808.02485](https://arxiv.org/abs/1808.02485). [Bibcode](/source/Bibcode_(identifier)):[2018ApJS..237...25K](https://ui.adsabs.harvard.edu/abs/2018ApJS..237...25K). [doi](/source/Doi_(identifier)):[10.3847/1538-4365/aac2d5](https://doi.org/10.3847%2F1538-4365%2Faac2d5). [ISSN](/source/ISSN_(identifier)) [0067-0049](https://search.worldcat.org/issn/0067-0049).

v t e Constellation of Draco List of stars in Draco Draco in Chinese astronomy Stars Bayer α (Thuban) β (Rastaban) γ (Eltanin) δ (Altais) ε (Tyl) ζ (Aldhibah) η (Athebyne) θ ι (Edasich) κ λ (Giausar) μ (Alrakis) ν (Kuma) ξ (Grumium) ο π ρ σ (Alsafi) τ υ φ χ ψ1 (Dziban) ψ2 ω Flamsteed 4 6 7 (Tianyi) 8 (Taiyi) 10 (i) 15 (A) 18 (g) 19 (h) 26 36 39 (b) 42 (Fafnir) 45 (d) 50 59 64 (e) 68 Variable TW YY AG BY CL CM CX DO EK HP V581 HR 3751 4126 4934 5811 6237 6518 6618 (Alruba) 6817 7137 7783 HD 109246 (Funi) 101364 128717 147379 156279 158259 176693 191939 Other 2MASS 1237+6526 2MASS J17554042+6551277 G 240-72 GD 356 Gliese 420 Gliese 625 Gliese 687 GRW +70 8247 Kepler-4 Kepler-10 Kepler-12 Kepler-90 Kepler-296 KOI-256 LP 71-82 Qatar-1 SDSS J1240+6710 Struve 2398 TOI-1136 WD 1856+534 WISE 1647+5632 WISE 1841+7000 Exoplanets HD 139357 b HD 167042 b ι Dra b (Hypatia) Kepler-4b Kepler-10b c Kepler-12b Kepler-90e f g h i Kepler-296b c d e f TOI-1452 b TrES-2b Star clusters LAMOST 1 Nebulae Cat's Eye Nebula NGC 6742 Galaxies NGC 3147 3197 3735 4121 4125 4221 4236 4319 4331 4332 4363 4441 4513 4545 4589 5678 5777 5866 5866B 5879 5905 5907 5949 5963 5965 5982 5985 6090 6248 6285 6286 6338 6340 6365 6373 6394 6412 6503 6505 6566 6621 6622 6670 6676 6786 6789 Other 1ES 1927+654 1ES 1959+650 3C 249.1 3C 305 3C 319 3C 343 3C 343.1 3C 351 3C 356 3C 371 3C 380 3C 390.3 3C 401 4C +72.26 4C 73.08 8C 1241+735 Abell 2218 BCG Bean galaxy Beaver galaxy BZQ J1727+5510 Draco Dwarf Draco II GB 1508+5714 Goldfish galaxy H1821+643 HFLS3 IERS B1946+708 IRAS F17179+5444 IRAS 18580+6527 J120011.1+680924.8 KKR 25 Markarian 817 Markarian 876 Original TRG PGC 39058 Porphyrion QSO B1823+568 RGZ J172749.5+534647 S5 1803+784 S5 2007+777 SDSS J1715+6008 Tadpole Galaxy UGC 9391 UGC 9405 UGC 11241 UGC 11411 WISEA J145223.62+611707.5 WN B1851+5707 Galaxy clusters Abell 2218 CL1358+62 Draco Supercluster NGC 5866 Group Astronomical events SN 2003jb SN 2005B SN 2016aps Swift J1644+57 Category

This variable star–related article is a stub. You can help Wikipedia by adding missing information.

- [v](https://en.wikipedia.org/wiki/Template:Var-star-stub)
- [t](/source/Template_talk%3AVar-star-stub)
- [e](https://en.wikipedia.org/wiki/Special:EditPage/Template:Var-star-stub)

This exoplanet related article is a stub. You can help Wikipedia by adding missing information.

- [v](https://en.wikipedia.org/wiki/Template:Exoplanet-planet-stub)
- [t](/source/Template_talk%3AExoplanet-planet-stub)
- [e](https://en.wikipedia.org/wiki/Special:EditPage/Template:Exoplanet-planet-stub)

---
Adapted from the Wikipedia article [2MASS 1237+6526](https://en.wikipedia.org/wiki/2MASS_1237%2B6526) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/2MASS_1237%2B6526?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.