Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Monoceros |
Right ascension | 07h 11m 51.860s [1] |
Declination | −00° 29′ 33.96″ [1] |
Apparent magnitude (V) | 4.15 [2] |
Characteristics | |
Spectral type | A2V [3] or A0IV [4] |
U−B color index | +0.04 [5] |
B−V color index | +0.00 [5] |
Astrometry | |
Radial velocity (Rv) | +15.0±4.1 [6] km/s |
Proper motion (μ) |
RA: +0.79
[7]
mas/
yr Dec.: +4.52 [7] mas/ yr |
Parallax (π) | 8.49 ± 0.17 mas [7] |
Distance | 384 ± 8
ly (118 ± 2 pc) |
Absolute magnitude (MV) | −1.20 [2] |
Details | |
Mass | 2.4+0.43 −0.38 [3] M☉ |
Luminosity | 350 [8] L☉ |
Surface gravity (log g) | 3.5±0.25 [3] cgs |
Temperature | 9,462 [8] K |
Metallicity [Fe/H] | 0.00 [9] dex |
Rotational velocity (v sin i) | 175.5±1.3 [10] km/s |
Age | 405+135 −207 [3] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Delta Monocerotis, which is Latinized from δ Monocerotis, is a single star [12] in the constellation of Monoceros, positioned about a half degree south of the celestial equator. It has a white hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.15. [2] The distance to this star is approximately 384 light years based on parallax. [7] It is drifting further away from the Sun with a radial velocity of about +15 km/s, [6] having come to within 88 light-years some 7.3 million years ago. [2] The star has an absolute magnitude of −1.20. [2]
The Bright Star Catalogue assigns this star a stellar classification of A2V, suggesting this is an A-type main-sequence star. [3] [13] However, Houk and Swift (1999) found a more evolved subgiant class of A0IV. [4] It has around 2.4 times the mass of the Sun and is an estimated 405 million years old. [3] The star has a high rate of spin with a projected rotational velocity of 175.5 km/s, [10] giving it an equatorial bulge that is 5% larger than the polar radius. [14] It is radiating 350 times the luminosity of the Sun from its photosphere at an effective temperature of 9,462 K. [8]
It has one reported visual companion, designated component B, at an angular separation of 32.0 ″ and visual magnitude 13.0. [15]
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cite web}}
: CS1 maint: postscript (
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Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Monoceros |
Right ascension | 07h 11m 51.860s [1] |
Declination | −00° 29′ 33.96″ [1] |
Apparent magnitude (V) | 4.15 [2] |
Characteristics | |
Spectral type | A2V [3] or A0IV [4] |
U−B color index | +0.04 [5] |
B−V color index | +0.00 [5] |
Astrometry | |
Radial velocity (Rv) | +15.0±4.1 [6] km/s |
Proper motion (μ) |
RA: +0.79
[7]
mas/
yr Dec.: +4.52 [7] mas/ yr |
Parallax (π) | 8.49 ± 0.17 mas [7] |
Distance | 384 ± 8
ly (118 ± 2 pc) |
Absolute magnitude (MV) | −1.20 [2] |
Details | |
Mass | 2.4+0.43 −0.38 [3] M☉ |
Luminosity | 350 [8] L☉ |
Surface gravity (log g) | 3.5±0.25 [3] cgs |
Temperature | 9,462 [8] K |
Metallicity [Fe/H] | 0.00 [9] dex |
Rotational velocity (v sin i) | 175.5±1.3 [10] km/s |
Age | 405+135 −207 [3] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Delta Monocerotis, which is Latinized from δ Monocerotis, is a single star [12] in the constellation of Monoceros, positioned about a half degree south of the celestial equator. It has a white hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.15. [2] The distance to this star is approximately 384 light years based on parallax. [7] It is drifting further away from the Sun with a radial velocity of about +15 km/s, [6] having come to within 88 light-years some 7.3 million years ago. [2] The star has an absolute magnitude of −1.20. [2]
The Bright Star Catalogue assigns this star a stellar classification of A2V, suggesting this is an A-type main-sequence star. [3] [13] However, Houk and Swift (1999) found a more evolved subgiant class of A0IV. [4] It has around 2.4 times the mass of the Sun and is an estimated 405 million years old. [3] The star has a high rate of spin with a projected rotational velocity of 175.5 km/s, [10] giving it an equatorial bulge that is 5% larger than the polar radius. [14] It is radiating 350 times the luminosity of the Sun from its photosphere at an effective temperature of 9,462 K. [8]
It has one reported visual companion, designated component B, at an angular separation of 32.0 ″ and visual magnitude 13.0. [15]
{{
cite web}}
: CS1 maint: postscript (
link)