Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Hydra |
Right ascension | 08h 43m 40.37345s [1] |
Declination | −07° 15′ 01.4323″ [1] |
Apparent magnitude (V) | 4.64 [2] |
Characteristics | |
Spectral type | G1Ib [3] |
B−V color index | +0.80 [2] |
Astrometry | |
Radial velocity (Rv) | 28.50 [4] km/s |
Proper motion (μ) | RA: −11.62 [1] mas/yr Dec.: −1.36 [1] mas/yr |
Parallax (π) | 4.24 ± 0.17 mas [1] |
Distance | 770 ± 30 ly (236 ± 9 pc) |
Absolute magnitude (MV) | −2.77 [5] |
Details | |
Mass | 5.2 [3] M☉ |
Radius | 110 [6] R☉ |
Surface gravity (log g) | 2.08 [3] cgs |
Temperature | 5,370 [3] K |
Metallicity [Fe/H] | −0.01 [7] dex |
Rotational velocity (v sin i) | 10.5 [8] km/s |
Age | 89 [3] [9] Myr |
Other designations | |
Database references | |
SIMBAD | data |
F Hydrae, also known as HD 74395, is a star in the constellation Hydra with an apparent magnitude is 4.64. It was catalogued as 31 Monocerotis, but this name is now rarely used since the star is now within the boundaries of Hydra. [10] It is a low mass yellow supergiant around a thousand times brighter than the sun and five times as massive.
F Hya is a catalogued as a triple star, with 8th magnitude BD-06°2707 80" away and 13th magnitude companion at 57". [11]
Alpha Persei, formally named Mirfak, is the brightest star in the northern constellation of Perseus, outshining the constellation's best-known star, Algol. Alpha Persei has an apparent visual magnitude of 1.8, and is a circumpolar star when viewed from mid-northern latitudes.
Gamma Cygni, officially named Sadr, is a star in the northern constellation of Cygnus, forming the intersection of an asterism of five stars called the Northern Cross. Based upon parallax measurements obtained during the Hipparcos mission, it is approximately 1,800 light-years (560 parsecs) from the Sun.
Nu Aquilae, Latinized from ν Aquilae, is the Bayer designation for a double star in the constellation of Aquila that lies close to the celestial equator. It has an apparent visual magnitude of 4.72 and so is visible to the naked eye. Based upon an annual parallax shift of only 0.8752 mas, it is believed to lie approximately 3,700 light-years from Earth. The variable star NU Aquilae has a similar-looking designation but is a separate and unrelated object.
22 Andromedae, abbreviated 22 And, is a single star in the constellation Andromeda. 22 Andromedae is the Flamsteed designation. It is visible to the naked eye with an apparent visual magnitude of 5.04. The distance to 22 And can be estimated from its annual parallax shift of just 2.2 mas, which shows it to be around 1,500 light years away. It is moving closer to the Earth with a heliocentric radial velocity of −8.2 km/s.
19 Aurigae is a single star located approximately 3,800 light years away from the Sun in the northern constellation Auriga. It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 5.05. The star is moving closer to the Earth with a heliocentric radial velocity of 4.3 km/s.
Iota Cancri is a double star in the constellation Cancer approximately 300 light years from Earth.
Beta Camelopardalis, Latinised from β Camelopardalis, is the brightest star in the northern constellation of Camelopardalis. It is bright enough to be faintly visible to the naked eye, having an apparent visual magnitude of 4.02. Based upon an annual parallax shift of 3.74 mas as seen from Earth, it is located roughly 870 light-years from the Sun. It is moving closer with a radial velocity of −1.90 km/s and is most likely a single star.
ν Persei, Latinized as Nu Persei, is a single star and a suspected variable in the northern constellation of Perseus. It has a yellow-white hue and is visible to the naked eye with an apparent visual magnitude of 3.80. This object is located approximately 560 light-years from the Sun based on parallax but is drifting closer with a radial velocity of −12 km/s.
HD 185018 is supergiant star in the equatorial constellation of Aquila.
Nu Herculis, Latinized from ν Herculis, is a binary and variable star in the constellation of Hercules. With an apparent magnitude of about 4.4, it is faintly visible to the naked eye. Parallax measurements made by the Hipparcos spacecraft put it at a distance of about 860 light years.
41 Cygni is a single star in the northern constellation of Cygnus, located near the southern border with Vulpecula. It is visible to the naked eye as a faint, yellow-white hued star with an apparent visual magnitude of 4.02. The star lies at a distance of around 770 light years from the Sun, based on parallax, and is drifting closer with a radial velocity of −18 km/s.
45 Draconis is a single star located in the northern circumpolar constellation of Draco, around 3,500 light years from the Earth. 45 Draconis is the Flamsteed designation, while it has the Bayer designation of d Draconis. This object is visible to the naked eye as a faint, yellow-white hued star with an apparent visual magnitude of 4.78. Radial velocity measurements indicate it is moving closer to the Sun at the rate of −12.5 km/s.
37 Leonis Minoris is a single, yellow-hued star in the northern constellation of Leo Minor. It is faintly visible to the naked eye with an apparent visual magnitude of 4.68. The star is moving closer to the Sun with a heliocentric radial velocity of −8 km/s. The annual parallax shift of 5.58±0.24 mas provides a distance estimate of roughly 580 light years.
Gamma1 Normae, Latinized from γ1 Normae, is a single, yellow-white hued star in the southern constellation of Norma. It is faintly visible to the naked eye with an apparent visual magnitude of 4.98. The annual parallax shift is only 2.22±0.27 mas as measured from Earth, which yields a rough distance estimate of 1,500 light years from the Sun. It is moving closer to the Sun with a radial velocity of around -16 km/s.
9 Pegasi is a supergiant star in the constellation Pegasus. Its apparent magnitude is 4.35.
HD 59612 is a class A5Ib supergiant star in the constellation Puppis. Its apparent magnitude is 4.86 and it is approximately 4,300 light years away based on parallax.
20 Puppis is a solitary star in the southern constellation of Puppis. It is visible to the naked eye as a faint, yellow-hued star with an apparent visual magnitude of 4.99. The star lies approximately 990 light years away from the Sun based on parallax. It is receding from the Earth with a heliocentric radial velocity of +16.8 km/s.
35 Cygni is a spectroscopic binary star in the constellation Cygnus. Its apparent magnitude is 5.18. Located around 1,000 parsecs (3,300 ly) distant, its primary is a yellow supergiant of spectral type F6Ib, a massive star that has used up its core hydrogen and is now fusing heavier elements.
S Sagittae, also known by the Flamsteed designation of 10 Sagittae, a Classical Cepheid variable in the constellation Sagitta that varies from magnitude 5.24 to 6.04 in 8.382 days. Its variable star designation of "S" indicates that it was the second star discovered to be variable in the constellation. Irish amateur astronomer John Ellard Gore was the first to observe its variability in 1885, and Ralph Hamilton Curtiss discovered its changing radial velocity in 1903–04. Harlow Shapley observed in 1916 that the spectrum of it and other Cepheids varied with its brightness, recording it as spectral type F0 leading to maximum, F4 at maximum, and G3 just before minimum brightness.
HD 25291, also known as HR 1242, is a solitary, yellowish-white hued star located in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.12, making it one of the brighter members of this generally faint constellation. The object is relatively far at a distant of approximately 2,100 light years but is drifting closer with a heliocentric radial velocity of −20.3 km/s.