Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Ara |
Right ascension | 17h 01m 47.3875s [2] |
Declination | –58° 57′ 29.681″ [2] |
Apparent magnitude (V) | 6.137 [3] |
Characteristics | |
Spectral type | B1 V:ne [4] or B2 IVne [5] |
U−B color index | –0.956 [3] |
B−V color index | –0.078 [3] |
Astrometry | |
Radial velocity (Rv) | –6 [6] km/s |
Proper motion (μ) | RA: –2.91 [2] mas/yr Dec.: –9.01 [2] mas/yr |
Parallax (π) | 2.32 ± 0.38 mas [2] |
Distance | approx. 1,400 ly (approx. 430 pc) |
Details | |
Mass | 10.1 ± 0.3 [5] M☉ |
Radius | 4.5 [7] R☉ |
Luminosity (bolometric) | 11,045 [8] L☉ |
Temperature | 21,150 [8] K |
Age | 20.4 ± 0.4 [5] Myr |
Other designations | |
Database references | |
SIMBAD | data |
HD 153261 is the Henry Draper Catalogue designation for a star in the southern constellation of Ara. It has an apparent visual magnitude of 6.137, [3] placing it near the threshold of naked eye visibility. According to the Bortle Dark-Sky Scale, it can be viewed from dark suburban or rural skies. Based upon an annual parallax shift of just 2.32 mas, [2] it is located at a distance of around 1,400 light-years (430 parsecs ) from Earth.
In 1983, Christopher Stagg reported that he suspected that HD 153261 is a variable star, and his later observations confirmed that it is in fact variable. [10] [11] HD 153261 was given its variable star designation, V828 Arae, in 1987. [12]
This star has been catalogued with a stellar classification of B1 V:ne [4] or B2 IVne, [5] indicating that it is either a main sequence or a subgiant star. The 'n' indicates a nebulous spectrum created by the Doppler shift-broadened absorption lines from a rapid rotation, while the 'e' means this is a Be star, with the spectrum showing emission lines from hot, circumstellar gas. HD 153261 displays some variability with an amplitude of 0.090 in magnitude, and is a suspected spectroscopic binary. [1]
HD 153261 is a large star with over ten [5] times the Sun's mass and around 4.5 [7] the radius of the Sun. It shines with more than 11,000 [8] times the brightness of the Sun, with this energy being radiated into space at an effective temperature of 21,150 K. [8] At this heat, it glows with the blue-white hue of a B-type star. [13]
Kappa Trianguli Australis is a star in the constellation Triangulum Australe.
Epsilon Apodis, Latinized from ε Apodis, is the Bayer designation for a star in the southern circumpolar constellation of Apus. It has an apparent visual magnitude of 5.06, which is bright enough to be viewed from dark suburban skies. Based upon parallax measurements, it is at a distance of roughly 640 light-years from Earth.
V539 Arae (Bayer designation Nu1 Arae (ν1 Arae / ν1 Ara)) is a triple star system in the southern constellation of Ara. It is a variable star, the brightness of which varies from magnitude 5.71 to 6.24, making it faintly visible to the naked eye under good observing conditions. Based upon an annual parallax shift of 3.30 ± 0.47, this system is at a distance of roughly 1,000 light-years (310 parsecs) from Earth.
Kappa Canis Majoris, Latinized from κ Canis Majoris, is a solitary, blue-white hued star in the constellation Canis Major. It is visible to the naked eye with an apparent visual magnitude of +3.87. Based upon an annual parallax shift of 7.70 mas as seen from Earth, this star is located about 660 light years from the Sun.
Zeta Persei is a star in the northern constellation of Perseus. With an apparent visual magnitude of 2.9, it can be readily seen with the naked eye. Parallax measurements place it at a distance of about 846 light-years from Earth, though measuremets of its Ca II lines place it at 1,300 light-years.
Delta Centauri, Latinized from δ Centauri, is a star in the southern constellation of Centaurus. The apparent visual magnitude of this star is +2.57, making it readily visible to the naked eye. Based upon parallax measurements, it is located at a distance of about 410 light-years from the Earth. The star is drifting further away with a radial velocity of +11 km/s.
p Carinae is the Bayer designation of a star in the southern constellation of Carina. It has the variable star designation PP Carinae and, at an apparent visual magnitude of +3.3, is readily visible to the naked eye from the southern hemisphere. From the observed parallax shift of this star as the Earth orbits the Sun, its distance can be estimated as roughly 480 light-years with a 6% margin of error. It is considered to be a member of the open cluster IC 2602 although it lies well outside the core visible group of stars.
Chi Carinae, Latinised from χ Carinae, is a star in the southern constellation of Carina. It is a third-magnitude star and is one of the brighter members of the constellation. The distance to the star can be determined directly through parallax measurements, yielding an estimate of roughly 450 light-years with a 6.7% margin of error. This star is a suspected astrometric binary, although nothing is known about the companion.
V382 Carinae, also known as x Carinae, is a yellow hypergiant in the constellation Carina. It is a G-type star with a mean apparent magnitude of +3.93, and a variable star of low amplitude.
Kappa Cassiopeiae is a star in the constellation Cassiopeia.
HD 223229 is a suspected variable star in the northern constellation of Andromeda. It is a double star consisting of a magnitude 6.11 primary and a magnitude 8.73 companion. The pair have an angular separation of 0.80″ along a position angle of 250°, as of 2009. The primary is a B-type subgiant star with a stellar classification of B3IV. It has an estimated 6.3 times the mass of the Sun, with an effective temperature of 17,900 K.
EO Aurigae is an eclipsing binary of Algol type in the northern constellation of Auriga. With a combined apparent magnitude of 7.71, it is too faint to be seen with the unaided eye.
HD 34626, also known as MZ Aurigae, is an unusual variable star in the northern constellation of Auriga. It has an apparent magnitude of 8.2 and is about 3,300 light years away.
HD 192685, also known as QR Vulpeculae or HR 7739, is a Be star about 1,000 ly away in the Vulpecula constellation. It is visible to the naked eye.
2 Vulpeculae is a binary star system in the northern constellation of Vulpecula, located around 1,800 light years away from the Sun. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of 5.43.
V381 Cephei is a triple star system in the northern constellation of Cepheus. Its apparent magnitude is slightly variable between 5.5 and 5.7.
Chi2 Orionis is a B-type blue supergiant star in the constellation of Orion. It has an apparent visual magnitude of 4.63 but being quite distant, and heavily extinguished it burns with the greatest absolute visual light magnitude among stars in Orion within the near reaches of the galaxy, 0.9 of a magnitude brighter than Rigel. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified. It is considered to be a member of the Gemini OB1 association.
V518 Carinae is a naked-eye variable star in the constellation Carina. It is a member of the bright open cluster IC 2602 near the Carina Nebula.
HD 93607 is a star in the constellation Carina. Its apparent magnitude is 4.87. Its parent cluster is IC 2602.
λ Librae is the Bayer designation for a binary star system in the zodiac constellation of Libra. It can be faintly seen with the naked eye, having an apparent visual magnitude of 5.03. With an annual parallax shift of 10.54 mas, it is roughly 310 light years from the Sun. At that distance, the visual magnitude of this system is diminished by an extinction factor of 0.22 due to interstellar dust. It is 0.1 degree north of the ecliptic.
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