Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Puppis |
Right ascension | 07h 51m 46.30295s [1] |
Declination | −13° 53′ 52.9169″ [1] |
Apparent magnitude (V) | 5.16 [2] |
Characteristics | |
Spectral type | G0V [3] (G1 + G9) [4] |
B−V color index | 0.600±0.007 [2] |
Astrometry | |
Radial velocity (Rv) | −21.34±0.16 [5] km/s |
Proper motion (μ) | RA: −67.75 [1] mas/yr Dec.: −346.66 [1] mas/yr |
Parallax (π) | 60.59 ± 0.59 mas [1] |
Distance | 53.8 ± 0.5 ly (16.5 ± 0.2 pc) |
Absolute magnitude (MV) | 4.07 [2] (4.65 + 5.30) [6] |
Orbit [5] | |
Period (P) | 22.7010 ± 0.0270 yr |
Semi-major axis (a) | 602.0±7.2 mas |
Eccentricity (e) | 0.741±0.007 |
Inclination (i) | 80.4±0.21° |
Longitude of the node (Ω) | 102.9±0.27° |
Periastron epoch (T) | 1,985.92±0.021 Byr |
Argument of periastron (ω) (secondary) | 73.1±0.4° |
Semi-amplitude (K1) (primary) | 9.12±0.63 km/s |
Semi-amplitude (K2) (secondary) | 9.69±0.26 km/s |
Details | |
A | |
Mass | 1.061±0.002 [4] M☉ |
Surface gravity (log g) | 4.21 [7] cgs |
Temperature | 5,917±80 [7] K |
Metallicity [Fe/H] | −0.13 [7] dex |
Rotational velocity (v sin i) | 6.4±0.1 [8] km/s |
Age | 6.83 [9] Gyr |
B | |
Mass | 0.900±0.002 [4] M☉ |
Other designations | |
Database references | |
SIMBAD | data |
9 Puppis is a binary star system in the southern constellation of Puppis. [10] It was originally designated 9 Argus, [11] being part of the now defunct Argo Navis constellation. The system is faintly visible to the naked eye as a point of light with a combined apparent visual magnitude of 5.16. [2] The magnitude difference between the two stars is 0.65. [6] Parallax measurements yield a distance estimate to 9 Puppis of approximately 54 light years from the Sun, with the dynamic and trigonometric parallaxes for the system being in close agreement. [4] It is drifting closer with a systemic radial velocity of –21 km/s. [5] The motion of the system through space is predicted to bring it as close as 42.2 light-years in about 292,000 years. [2]
The binary nature of this system was discovered by S. W. Burnham in 1873, [12] and it now has the discovery code BU 101 [10] (originally: β 101 [11] ). Early efforts at computing orbital elements were made by Burnham (1894), Aitken (1914), and others. [11] The latest refined elements show an orbital period of 22.7 years with a large eccentricity (ovalness) of 0.74. [5] The orbital plane is highly inclined to the line of sight [13] at an angle of 80.4°. [5]
The physical size of the system's semimajor axis is estimated to be 10 AU . The large eccentricity of their orbit means a circumstellar planetary orbit would most likely only be stable over long periods with a semimajor axis inside 0.67 AU from the primary and 0.63 AU from the secondary. [14] An outer circumbinary planet would have a stable orbit with a semimajor axis beyond about 34.5 AU from the barycenter. [15] [16]
The stellar classification of the 9 Puppis system is G0V, [3] matching a G-type main-sequence star like the Sun. The dynamic masses of the components are 1.06 and 0.90 times the mass of the Sun, yielding estimated individual stellar classes of G1 for the primary and G9 for the secondary, respectively. [4] The system has been listed as a probable member of the Ursa Major Moving Group, [17] but was excluded by Soderblom and Mayor (1993) due to low lithium abundance and low X-ray flux. [18] Their age determined from chromospheric heating is around seven billion years. [9]
70 Ophiuchi is a binary star system located 16.6 light years away from the Earth. It is in the constellation Ophiuchus. At magnitude 4 it appears as a dim star visible to the unaided eye away from city lights.
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Gliese 412 is a pair of stars that share a common proper motion through space and are thought to form a binary star system. The pair have an angular separation of 31.4″ at a position angle of 126.1°. They are located 15.8 light-years distant from the Sun in the constellation Ursa Major. Both components are relatively dim red dwarf stars.
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26 Draconis is a triple star system in the constellation Draco, located 46 light years from the Sun. Two of the system components, A and B, form a spectroscopic binary that completes an orbit every 76 years. The composite spectral classification of the AB pair is G0V, which decomposes to individual spectral types F9V and K3V. A 1962 study estimated the masses of these two stars as 1.30 and 0.83 times the mass of the Sun, respectively. The stars are considered moderately metal-poor compared to the Sun, which means they have a lower proportion of elements other than hydrogen or helium.
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171 G. Puppis is a triple star system in the constellation of Puppis – the stern of Argo Navis – of apparent magnitude +5.38. Lacking a Bayer designation, it is instead known by its Gould designation. Based upon parallax measurements, the system is 49.6 light years away from the Solar System.
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