2MASS J0441+2301
2MASS J0441+2301 is a young quadruple system hosting a planetary-mass object, a red dwarf star and two brown dwarfs, approximately 470 light years (145 parsecs) away.
2MASS J04414489+2301513 is a brown dwarf with a companion about 5–10 times the mass of Jupiter. | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Taurus |
| 2MASS J04414489+2301513 | |
| Right ascension | 04h 41m 44.898s |
| Declination | +23° 01′ 51.39″ |
| 2MASS J04414565+2301580 | |
| Right ascension | 04h 41m 45.652s |
| Declination | +23° 01′ 58.07″ |
| Apparent magnitude (V) | 15.20 |
| Characteristics | |
| Spectral type | M4.5/M8.5 |
| Variable type | T Tau |
| Astrometry | |
| Proper motion (μ) | RA: 7.918 mas/yr Dec.: -20.152 mas/yr |
| Parallax (π) | 8.1822 ± 0.3044 mas |
| Distance | 400 ± 10 ly (122 ± 5 pc) |
| 2MASS J04414565+2301580 | |
| Proper motion (μ) | RA: 7.914 mas/yr Dec.: -22.086 mas/yr |
| Parallax (π) | 8.0887 ± 0.0713 mas |
| Distance | 403 ± 4 ly (124 ± 1 pc) |
| Details | |
| 2MASS J04414489+2301513 | |
| Mass | 19 ± 3 / 9.8 ± 1.8 MJup |
| Luminosity | 0.00347 / 0.00093 L☉ |
| Temperature | 2100 / 1800 K |
| Age | 1 Myr |
| 2MASS J04414565+2301580 | |
| Mass | 0.20+1.0 −0.05 M☉ / 35 ± 5 MJup |
| Luminosity | 0.14 / 0.00741 L☉ |
| Temperature | 3400 / 2800 K |
| Age | 1 Myr |
| Other designations | |
WDS J04417+2302AB | |
| 2MASS J04414565+2301580: ATO J070.4402+23.0326, TIC 118893901, UCAC2 39972132, UCAC4 566-011236, UGCS J044145.65+230158.0, WISE J044145.65+230157.8, WISEA J044145.65+230157.7, Gaia DR3 146487560507840768, Gaia DR2 146487560507840768 | |
| 2MASS J04414489+2301513: Gaia DR3 146487556211644544, Gaia DR2 146487556211644544, UGCS J044144.89+230151.3, USNO-B1.0 1130-00071517, TIC 118893899 | |
| Database references | |
| SIMBAD | 2M J044144 |
| 2M J044145 | |
The 2MASS J04414489+2301513 Bab primary (a brown dwarf) has a large separation (12.4 arcseconds) companion, 2MASS J04414565+2301580 Aa (abbreviated as 2M J044145), which in turn has a nearby small separation substellar companion (separation of 0.23 arcseconds to the northeast). 2M J044145 has similar proper motion to 2M J044144 and is likely physically associated with the system. The entire system of 4 objects is then a hierarchical quadruple of two binary objects orbiting each other. The primary component Aa has a spectral type of M4.5 and a red apparent magnitude of 14.2. Both components seem to be accreting mass from their stellar disks, as shown by their emission lines. The four objects have a total mass of only 26% of the Sun, making it the quadruple star system with the lowest mass known.