V1647 Orionis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Orionis |
| Right ascension | 05h 46m 13.14s |
| Declination | −00° 06′ 4.9″ |
| Apparent magnitude (V) | 23.3 (Quiet) 14 - 19 (Eruption) |
| Characteristics | |
| Evolutionary stage | Pre-main-sequence (FU Orionis) |
| Spectral type | M3.9 |
| B−V color index | 1.41 |
| Astrometry | |
| Radial velocity (Rv) | 40.3535 km/s |
| Proper motion (μ) | RA: -0.918 mas/yr Dec.: -1.057 mas/yr |
| Parallax (π) | 2.422±0.1202 mas |
| Distance | 1,350 ± 70 ly (410 ± 20 pc) |
| Details | |
| Mass | 0.8 ± 0.2 M☉ |
| Radius | 3 R☉ |
| Luminosity | 9.55 (Quiet) 44 (Eruption) L☉ |
| Temperature | 3773.15 K |
| Rotation | 1 day |
| Rotational velocity (v sin i) | 120 km/s |
| Age | ~0.5 Myr |
| Other designations | |
| V1647 Ori, 2MASS J05461313-0006048, IRAS 05436-0007, HOPS 388, GaiaDR2 3219119189974545024, GaiaDR3 3219119189974545024, LMZ 12, TIC 176448070, OriBsmm 55, SDSS J054613.14-000604.1 | |
| Database references | |
| SIMBAD | data |
V1647 Orionis (V1647 Ori) is a young stellar object visible in the constellation Orion, located about 1470 light-years from the Solar System. It is situated in the reflection nebula M78 and is associated with McNeil's Nebula.
The object is known to have experienced intense eruptive phenomena on several occasions (the last of which occurred in 2008), the characteristics of which have led to the object being considered a middle ground between two classes of pre-main-sequence star, FU Orionis (FUor) and EX Lupi (EXor).