Phi Aquarii
Template:Location mark Location of φ Aquarii (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | +4.223[2] |
| Characteristics | |
| Spectral type | M1.5 III[3] |
| U−B Template:Engvar | +1.897[2] |
| B−V Template:Engvar | +1.563[2] |
| Astrometry | |
| Radial velocity (Rv) | +2.48±0.32[4] km/s |
| Proper motion (μ) | RA: +36.575 mas/yr[1] Dec.: −195.441 mas/yr[1] |
| Parallax (π) | 14.3482±0.2594 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 0.30±0.120[5] |
| Details | |
| A | |
| Mass | 1.00±0.03[6] Template:Solar mass |
| Radius | 34.77Script error: No such module "Su".[6] Template:Solar radius |
| Luminosity | 207.7±25.2[6] Template:Solar luminosity |
| Surface gravity (log g) | 1.5[4] cgs |
| Temperature | 3,715±48[6] K |
| Rotational velocity (v sin i) | 6.7[4] km/s |
| Age | 10.97±0.83[6] Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[7] | |
| Database references | |
| SIMBAD | data |
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Phi Aquarii is a binary star[8] system in the equatorial constellation of Aquarius. Its name is a Bayer designation that is Latinized from φ Aquarii, and abbreviated Phi Aqr or φ Aqr. This system is visible to the naked eye as a point of light with a combined apparent visual magnitude of +4.223.[2] Parallax measurements indicate its distance from Earth is approximately Script error: No such module "convert"..[1] It is drifting further away with a radial velocity of +2.5 km/s.[4] The system is positioned 1.05 degrees south of the ecliptic so it is subject to lunar occultations.[9]
This is a spectroscopic binary star system with an estimated period of Script error: No such module "convert"..[10] The primary component is an aging red giant star with a stellar classification of M1.5 III.[3] At an estimated age of 11 billion years,[6] it has exhausted the supply of hydrogen at its core and evolved away from the main sequence. The star has the same mass as the Sun,[6] but has expanded to 35 times the Sun's girth.[6] It is radiating 208 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,715 K,[6] giving it the reddish hue of an M-type star.[11]
On 6 September 2019, it had a close conjunction (geocentric separation <1') with Neptune.[12] Template:Rp
References
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- ↑ a b c d e Template:Cite Gaia DR3
- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b c d Script error: No such module "citation/CS1".
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- ↑ a b c d e f g h i Script error: No such module "citation/CS1".
- ↑ Template:Cite simbad
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
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- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
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