Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aries |
Right ascension | 02h 47m 54.54142s [1] |
Declination | +29° 14′ 49.6132″ [1] |
Apparent magnitude (V) | 4.514 [2] |
Characteristics | |
Spectral type | K1.5 III [3] |
U−B color index | +1.083 [2] |
B−V color index | +1.118 [2] |
R−I color index | 0.58 |
Astrometry | |
Radial velocity (Rv) | –15.53 ± 0.14 [4] km/s |
Proper motion (μ) |
RA: +149.47 ± 0.25
[1]
mas/
yr Dec.: –127.05 ± 0.18 [1] mas/ yr |
Parallax (π) | 19.01 ± 0.21 mas [1] |
Distance | 172 ± 2
ly (52.6 ± 0.6 pc) |
Details | |
Mass | 1.6 [5] M☉ |
Radius | 11.1 ± 0.8 [3] R☉ |
Luminosity | 56 [4] L☉ |
Surface gravity (log g) | 2.7 [4] cgs |
Temperature | 4,603 [4] K |
Metallicity [Fe/H] | –0.02 [4] dex |
Rotational velocity (v sin i) | 4.5 [4] km/s |
Other designations | |
Database references | |
SIMBAD | data |
39 Arietis (abbreviated 39 Ari), officially named Lilii Borea /ˈlɪliaɪ ˈbɔːriə/, [7] is a star in the northern constellation of Aries. It is visible to the naked eye with an apparent visual magnitude of +4.5. [2] The distance to this star, as determined from an annual parallax shift of 19.01 mas, [1] is approximately 172 light-years (53 parsecs). This star was formerly located in the obsolete constellation Musca Borealis.
39 Arietis is the star's Flamsteed designation.
This star was described as Lilii Borea by Nicolas-Louis de Lacaille in 1757, [8] [9] as a star of the now-defunct constellation of Lilium (the Lily). The words are simply the Latin phrase Līliī Boreā 'in the north of Lilium'. Līliī Austrīnā /ɔːˈstraɪnə/ 'in the south of Lilium' was 41 Arietis.
In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) [10] to catalog and standardize proper names for stars. The WGSN approved the name Lilii Borea for this star on 5 September 2017 and it is now so included in the List of IAU-approved Star Names. [7]
In Chinese, 胃宿 (Wèi Su), meaning Stomach, refers to an asterism consisting of 39 Arietis, 35 Arietis and 41 Arietis. [11] Consequently, the Chinese name for 39 Arietis itself is 胃宿二 (Wèi Su èr, English: the Second Star of Stomach). [12]
39 Arietis is a giant star with a stellar classification of K1.5 III. [3] It is currently at an evolutionary stage known as the red clump, indicating that it is generating energy through the fusion of helium at its core. [5] It has 1.6 [5] times the mass of the Sun, but its outer envelope has expanded to around 11 [3] times the Sun's radius. It shines with 56 times the luminosity of the Sun. [4] This energy is being radiated into outer space from its outer atmosphere at an effective temperature of 4,603 K, [4] giving it the cool orange-hued glow of a K-type star. [13]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aries |
Right ascension | 02h 47m 54.54142s [1] |
Declination | +29° 14′ 49.6132″ [1] |
Apparent magnitude (V) | 4.514 [2] |
Characteristics | |
Spectral type | K1.5 III [3] |
U−B color index | +1.083 [2] |
B−V color index | +1.118 [2] |
R−I color index | 0.58 |
Astrometry | |
Radial velocity (Rv) | –15.53 ± 0.14 [4] km/s |
Proper motion (μ) |
RA: +149.47 ± 0.25
[1]
mas/
yr Dec.: –127.05 ± 0.18 [1] mas/ yr |
Parallax (π) | 19.01 ± 0.21 mas [1] |
Distance | 172 ± 2
ly (52.6 ± 0.6 pc) |
Details | |
Mass | 1.6 [5] M☉ |
Radius | 11.1 ± 0.8 [3] R☉ |
Luminosity | 56 [4] L☉ |
Surface gravity (log g) | 2.7 [4] cgs |
Temperature | 4,603 [4] K |
Metallicity [Fe/H] | –0.02 [4] dex |
Rotational velocity (v sin i) | 4.5 [4] km/s |
Other designations | |
Database references | |
SIMBAD | data |
39 Arietis (abbreviated 39 Ari), officially named Lilii Borea /ˈlɪliaɪ ˈbɔːriə/, [7] is a star in the northern constellation of Aries. It is visible to the naked eye with an apparent visual magnitude of +4.5. [2] The distance to this star, as determined from an annual parallax shift of 19.01 mas, [1] is approximately 172 light-years (53 parsecs). This star was formerly located in the obsolete constellation Musca Borealis.
39 Arietis is the star's Flamsteed designation.
This star was described as Lilii Borea by Nicolas-Louis de Lacaille in 1757, [8] [9] as a star of the now-defunct constellation of Lilium (the Lily). The words are simply the Latin phrase Līliī Boreā 'in the north of Lilium'. Līliī Austrīnā /ɔːˈstraɪnə/ 'in the south of Lilium' was 41 Arietis.
In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) [10] to catalog and standardize proper names for stars. The WGSN approved the name Lilii Borea for this star on 5 September 2017 and it is now so included in the List of IAU-approved Star Names. [7]
In Chinese, 胃宿 (Wèi Su), meaning Stomach, refers to an asterism consisting of 39 Arietis, 35 Arietis and 41 Arietis. [11] Consequently, the Chinese name for 39 Arietis itself is 胃宿二 (Wèi Su èr, English: the Second Star of Stomach). [12]
39 Arietis is a giant star with a stellar classification of K1.5 III. [3] It is currently at an evolutionary stage known as the red clump, indicating that it is generating energy through the fusion of helium at its core. [5] It has 1.6 [5] times the mass of the Sun, but its outer envelope has expanded to around 11 [3] times the Sun's radius. It shines with 56 times the luminosity of the Sun. [4] This energy is being radiated into outer space from its outer atmosphere at an effective temperature of 4,603 K, [4] giving it the cool orange-hued glow of a K-type star. [13]