HD 259431
Location of HD 259431 (circled) near the bluish IC 447 nebulosity. NGC 2264 is below (west) and the Rosette Nebula on the right (south). Credit: ESO/S. Guisard | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Monoceros |
| Right ascension | 06h 33m 05.19064s[1] |
| Declination | +10° 19′ 19.9826″[1] |
| Apparent magnitude (V) | 8.62 - 8.91[2] |
| Characteristics | |
| Spectral type | B6e[3] |
| U−B color index | −0.540[4] |
| B−V color index | 0.286[4] |
| Variable type | Orion[2] |
| Astrometry | |
| Radial velocity (Rv) | 19.00[5] km/s |
| Proper motion (μ) | RA: −2.410[1] mas/yr Dec.: −2.912[1] mas/yr |
| Parallax (π) | 1.5304±0.0273 mas[1] |
| Distance | 2,130 ± 40 ly (650 ± 10 pc) |
| Details | |
| Mass | 6.6[6] M☉ |
| Radius | 6.63[6] R☉ |
| Luminosity | 1,550[6] L☉ |
| Temperature | 14,125[6] K |
| Rotational velocity (v sin i) | 90[7] km/s |
| Age | 0.32[6] Myr |
| Other designations | |
| MWC 147, V700 Monocerotis, BD+10°1172, HD 259431, HIP 31235, SAO 95823, TYC 737-610-1 | |
| Database references | |
| SIMBAD | data |
HD 259431 (MWC 147 or V700 Monocerotis) is a young stellar object in the constellation of Monoceros.
Location
[edit | edit source]
HD 259431 lies in the northern portion of Monoceros, between Orion and Canis Minor, along with the spectacular Rosette Nebula and NGC 2264 region. It is half a degree from the faint IC 447 reflection nebula.
HD 259431 is seen against NGC 2247, a small reflection nebula and star-forming region. It has been considered to be the illuminating source for the nebula, although it is uncertain if they are at the same distance. The Hipparcos annual parallax gives a distance of 170 parsecs[8] while NGC 2247 is thought to be at about 800 parsecs, although both distances are somewhat uncertain.[9] Many of its properties have been calculated assuming a distance of 800 parsecs, which means they are also highly uncertain.[3] Gaia Data Release 3 gives a statistically precise distance around 650 parsecs.[1]
Properties
[edit | edit source].jpg){kind=link}
HD 259431 is classed as a Herbig Haro Be star and has been instrumental in helping astronomers understand the formation of stars.[6] A large star, with a large surrounding dust cloud,[7] MWC 147 has given astronomers a clear picture of the mechanics of the accretion processes that form stars.[11]
Star MWC 147 was observed in the near and mid-infrared. The near-infrared studies showed dust matter at a temperature of several thousand kelvins in the innermost regions of the protoplanetary disk. In the mid-IR were lower temperatures. These observations showed that the disk around the star disk extends over 100 AU.
The resulting research model assumes that the star increasing in mass at a rate 7×10−6 solar masses per year, or the equivalent of about two Earth masses per year. MWC has a mass of 6.6 M☉ and is younger than 500 000 years. This means that the life of this star is expected to be only about 35 million years.[citation needed]
The star is found in the night sky at RA 06 h 33 m 05.19 and Dec 10° 19' 19.9869". It has a temperature of 14 125 K and spectral type of B6ep. It is also known as 2MJ06330519 + 1019199, HD 259431, HIP 31235 and SAO 95823.
References
[edit | edit source]- ^ a b c d e f Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Gaia DR3 record for this source at VizieR.
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c d e f Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Vizier catalog entry
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
