A light curve for Mu Eridani, adapted from Jerzykiewicz et al. (2013). The red lines show the times of mid-eclipse.[1]
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation
Eridanus
Right ascension
04h 45m 30.15038s[2]
Declination
−03° 15′ 16.7765″[2]
Apparent magnitude (V)
4.00[3]
Characteristics
Spectral type
B5 IV[4]
U−B color index
−0.60[3]
B−V color index
−0.15[3]
Variable type
SPB and Algol[5]
Astrometry
Proper motion (μ)
RA: +0.25[2] mas/yr Dec.: −1.97[2] mas/yr
Parallax (π)
6.25 ± 0.19 mas[2]
Distance
520 ± 20 ly (160 ± 5 pc)
Absolute magnitude (MV)
−2.06±0.07[1]
Orbit[1]
Period (P)
7.38090 d
Eccentricity (e)
0.344±0.021
Periastron epoch (T)
2455143.254±0.067 HJD
Argument of periastron (ω) (secondary)
160.5±4.5°
Semi-amplitude (K1) (primary)
0.344±0.021 km/s
Details
μ Eri A
Mass
6.2±0.2[1]M☉
Radius
6.1[5]R☉
Luminosity
1,905[5]L☉
Surface gravity (log g)
3.5[1] cgs
Temperature
15,668[5] K
Metallicity [Fe/H]
0[1] dex
Rotational velocity (v sin i)
130±3[5] km/s
Other designations
μ Eri, BD-03°876, 57 Eridani, FK5 176, HD 30211, HIP 22109, HR 1520, SAO 131468.[6]
Database references
SIMBAD
data
Mu Eridani (μ Eridani) is a binary star system in the constellation Eridanus. It is visible to the naked eye with an apparent visual magnitude of 4.00.[3] Based upon an annual parallax shift of 0.00625 arcseconds,[2] it is located roughly 520 light years from the Sun.
In 1910, this was determined to be a single-lined spectroscopic binary star system. The pair orbit each other with a period of 7.38 days and an eccentricity of 0.344, during which they undergo Algol-like eclipses.[1] The primary is a slowly pulsating B-type star[5] with a stellar classification of B5 IV.[4] It has a relatively high rate of rotation with a projected rotational velocity of 130 km/s, which is at least 30% of the star's break-up velocity.[5] The star has about six times the Sun's mass and radius, and it shines with 1,905 times the solar luminosity from its outer atmosphere at an effective temperature of 15,668 K.[1][5]
^ abcdefghCite error: The named reference Jerzykiewicz2013 was invoked but never defined (see the help page).
^ abcdefCite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
^ abcdCite error: The named reference Crawford1971 was invoked but never defined (see the help page).
^ abCite error: The named reference Levato1975 was invoked but never defined (see the help page).
^ abcdefghCite error: The named reference DaszynskaDaszkiewicz2015 was invoked but never defined (see the help page).
^Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
MuEridani (μ Eridani) is a binary star system in the constellation Eridanus. It is visible to the naked eye with an apparent visual magnitude of 4.00...
in the constellation Eridanus, about a degree to the WNW of the star MuEridani. It is located at a distance of about 9.77 ± 1.82 Mpc (31.9 ± 5.9 Mly)...
belt is only 1/20 as dense as the belt around its young neighbor, Epsilon Eridani. The relative lack of debris around the Sun may be the unusual case: one...
Star 3.53 Mu Serpentis Binary star system 3.53 Delta Geminorum Triple star system 3.54 Iota Cephei Star 3.54 Xi Hydrae Star 3.54 Delta Eridani Star Suspected...
through parallax measurements, along with two other possibilities, Delta Eridani and Mu Cassiopeiae. A number of astronomers soon took up the task, including...
ٱلْنََهْر Theta Eridani Achernar Ākhiru-n-Nahr the River's or Stream's End / Tail / Edge / Border آخر النهر آخِرُ ٱلْنََهْر Alpha Eridani Acrab ʽAqrab the...
Nu1 Lupi List of extrasolar planets detected by radial velocity 82 G. EridaniMu Arae Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release...
done by Popper in 1954, measuring a 21 km/s gravitational redshift of 40 Eridani B. The redshift of Sirius B was finally measured by Greenstein et al. in...
interplanetary cruiser used for defensive and policing actions within the Epsilon Eridani system seen in the Revelation Space series. Discovery One – a scientific...
893 4 Planet b is a gas giant which orbits in the habitable zone. 82 G. Eridani Eridanus 03h 19m 55.65s −43° 04′ 11.2″ 4.254 19.71 G8V 0.7 5401 5.76 3 (3)...
8 July 2011 HD 7449 b 8 July 2011 82 G. Eridani b 17 August 2011 82 G. Eridani c 17 August 2011 82 G. Eridani d 17 August 2011 HD 85512 b 17 August 2011...
"Confirming Fundamental Properties of the Exoplanet Host Star epsilon Eridani Using the Navy Optical Interferometer" (2012, ApJ, 744, 138B)". The Astrophysical...
done by Popper in 1954, measuring a 21 km/s gravitational redshift of 40 Eridani B. The redshift of Sirius B was finally measured by Greenstein et al. in...
Fugate, Robert Q. (1995-09-01). "Full Adaptive Optics Images of ADS 9731 and MU Cassiopeiae: Orbits and Masses". The Astrophysical Journal. 450: 380. Bibcode:1995ApJ...
Neighborhood. XIII. Parallax Results from the CTIOPI 0.9 Meter Program: Stars with mu >= 1.0" yr-1 (MOTION Sample)". The Astronomical Journal. 129 (4): 1954–1967...
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