Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Vulpecula |
Right ascension | 20h 01m 06.0486s [1] |
Declination | +27° 45′ 12.863″ [1] |
Apparent magnitude (V) | 4.66 [2] (4.62 - 4.67) [3] |
Characteristics | |
Spectral type | A4IIIm [3] or kA5hA7mA7 (IV–V) [4] |
U−B color index | +0.15 [5] |
B−V color index | +0.18 [5] |
Variable type | α2 CVn [3] |
Astrometry | |
Radial velocity (Rv) | −26.10 [6] km/s |
Proper motion (μ) |
RA: 57.817±0.081
[1]
mas/
yr Dec.: 3.994±0.085 [1] mas/ yr |
Parallax (π) | 13.4427 ± 0.1050 mas [1] |
Distance | 243 ± 2
ly (74.4 ± 0.6 pc) |
Absolute magnitude (MV) | 0.36 [2] |
Details | |
Luminosity | 59.76 [2] L☉ |
Surface gravity (log g) | 3.45 [4] cgs |
Temperature | 8,084 [7] K |
Metallicity [Fe/H] | +0.02 [2] dex |
Rotational velocity (v sin i) | 15.0 [8] km/s |
Other designations | |
Database references | |
SIMBAD | data |
15 Vulpeculae is a variable star in the northern constellation of Vulpecula, located approximately 243 light years away based on parallax. [1] It has the variable star designation NT Vulpeculae; 15 Vulpeculae is the Flamsteed designation. It is visible to the naked eye as a faint, white-hued star with a typical apparent visual magnitude of 4.66. [2] This object is moving closer to the Earth with a heliocentric radial velocity of −26 km/s. [6]
This is an Am star with a stellar classification of A4 IIIm, [3] matching an evolved A-type giant star. However, Gray & Garrison (1989) found a class of kA5hA7mA7 (IV–V), [4] which matches a blend of subgiant and main sequence luminosity classes with the K-line (kA5) of an A5 star and the hydrogen (hA7) and metal (mA7) absorption lines of an A7 star. It is an Alpha2 Canum Venaticorum-type variable with magnitude ranging from 4.62 down to 4.67 over a period of 14 days. [3] The star is radiating 60 [2] times the Sun's luminosity from its photosphere at an effective temperature of 8,084 K. [7]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Vulpecula |
Right ascension | 20h 01m 06.0486s [1] |
Declination | +27° 45′ 12.863″ [1] |
Apparent magnitude (V) | 4.66 [2] (4.62 - 4.67) [3] |
Characteristics | |
Spectral type | A4IIIm [3] or kA5hA7mA7 (IV–V) [4] |
U−B color index | +0.15 [5] |
B−V color index | +0.18 [5] |
Variable type | α2 CVn [3] |
Astrometry | |
Radial velocity (Rv) | −26.10 [6] km/s |
Proper motion (μ) |
RA: 57.817±0.081
[1]
mas/
yr Dec.: 3.994±0.085 [1] mas/ yr |
Parallax (π) | 13.4427 ± 0.1050 mas [1] |
Distance | 243 ± 2
ly (74.4 ± 0.6 pc) |
Absolute magnitude (MV) | 0.36 [2] |
Details | |
Luminosity | 59.76 [2] L☉ |
Surface gravity (log g) | 3.45 [4] cgs |
Temperature | 8,084 [7] K |
Metallicity [Fe/H] | +0.02 [2] dex |
Rotational velocity (v sin i) | 15.0 [8] km/s |
Other designations | |
Database references | |
SIMBAD | data |
15 Vulpeculae is a variable star in the northern constellation of Vulpecula, located approximately 243 light years away based on parallax. [1] It has the variable star designation NT Vulpeculae; 15 Vulpeculae is the Flamsteed designation. It is visible to the naked eye as a faint, white-hued star with a typical apparent visual magnitude of 4.66. [2] This object is moving closer to the Earth with a heliocentric radial velocity of −26 km/s. [6]
This is an Am star with a stellar classification of A4 IIIm, [3] matching an evolved A-type giant star. However, Gray & Garrison (1989) found a class of kA5hA7mA7 (IV–V), [4] which matches a blend of subgiant and main sequence luminosity classes with the K-line (kA5) of an A5 star and the hydrogen (hA7) and metal (mA7) absorption lines of an A7 star. It is an Alpha2 Canum Venaticorum-type variable with magnitude ranging from 4.62 down to 4.67 over a period of 14 days. [3] The star is radiating 60 [2] times the Sun's luminosity from its photosphere at an effective temperature of 8,084 K. [7]