Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation
Eridanus
Right ascension
03h 46m 08.53581s[1]
Declination
−12° 06′ 05.7282″[1]
Apparent magnitude (V)
4.40[2](4.38 - 4.44[3])
Characteristics
Evolutionary stage
asymptotic giant branch[4]
Spectral type
M1 III[5]
U−B color index
+1.96[2]
B−V color index
+1.61[2]
Variable type
Lb?[3]
Astrometry
Radial velocity (Rv)
45.2±0.1[6] km/s
Proper motion (μ)
RA: +55.98[1] mas/yr Dec.: +59.28[1] mas/yr
Parallax (π)
6.78 ± 0.53 mas[1]
Distance
480 ± 40 ly (150 ± 10 pc)
Absolute magnitude (MV)
−1.40[7]
Details
Radius
77[8]R☉
Luminosity
1,123[9]L☉
Temperature
3,841[9] K
Other designations
π Eridani, π Eri, 26 Eridani, BD-12° 707, HD 23614, HIP 17593, HR 1162, SAO 149158.[10]
Database references
SIMBAD
data
Pi Eridani, Latinized from π Eridani, is a star in the constellation Eridanus. It has an apparent visual magnitude of 4.40,[2] which is bright enough to be seen on a dark, clear night. Based upon parallax measurements, it is located roughly 480 light years from the Sun.
This is an evolved red giant star with a stellar classification of M1 III,[5] and is currently on the asymptotic giant branch.[4] It is a slow irregular variable type LB that can increase in magnitude up to 4.38.[3][11] The measured angular diameter of this star is 4.8±0.5 mas.[12] At the estimated distance of Pi Eridani, this yields a physical size of about 77 times the radius of the Sun.[8] It shines with 1,123[9] times the luminosity of the Sun from an outer atmosphere at an effective temperature of 3,841 K.[9]
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^Cite error: The named reference Mennessie2001 was invoked but never defined (see the help page).
^Cite error: The named reference Richichi2005 was invoked but never defined (see the help page).
PiEridani, Latinized from π Eridani, is a star in the constellation Eridanus. It has an apparent visual magnitude of 4.40, which is bright enough to be...
Bayer designation are close together: π1 is nearly 9° north of π6 (Tau Eridani is an even more noteworthy example of this). π1 Ori (7 Orionis) π2 Ori...
variable star 2.87 Alcyone Triple star system 2.88 Pi Sagittarii Triple star system 2.88 Theta Eridani Binary star system 2.89 2.84 Beta Canis Minoris Star...
Still Devastated. Planetary Society (2006-11-26). Current status of TPF development work (March 2007) Interferometric Nulling at TNO Planet Imager (PI)...
about 45 years. ε Indi Ab is the second-closest Jovian exoplanet, after ε Eridani b. The ε Indi system provides a benchmark case for the study of the formation...
/ɪˈkwuːliaɪ/ ancient (Ptolemy) pony α Equulei Eridanus /ɪˈrɪdənəs/ Eri Erid Eridani /ɪˈrɪdənaɪ/ ancient (Ptolemy) river Eridanus (mythology) Achernar Fornax...
through parallax measurements, along with two other possibilities, Delta Eridani and Mu Cassiopeiae. A number of astronomers soon took up the task, including...
Charts claim that the Beta Quadrant contains the core worlds Vulcan (40 Eridani), Andoria (Procyon), Risa, and the Rigel (Beta Orionis) systems; the Alpha...
charge on an electron 1910: Williamina Fleming: the first white dwarf, 40 Eridani B 1911: Ernest Rutherford: Atomic nucleus 1911: Heike Kamerlingh Onnes:...
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...
Epsilon Draconis, Rho Draconis, 64 Draconis (see 64 Draconis (Portuguese)) and Pi Draconis. Consequently, the Chinese name for Sigma Draconis itself is 天廚二...
line. 54 Piscium (HD 3651) HD 168443 Gliese 229 A Epsilon Indi A HD 82943 Pi Mensae HD 38529 HD 245134 Lists of exoplanets Methods of detecting exoplanets...
could even be absent in the structure of V1449 Aquilae (HD 180642) and ν Eridani. It would be extremely interesting to establish a relation between the...
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...
by the IRAS spacecraft in 1983. Along with Vega, Fomalhaut and Epsilon Eridani, it was one of the first four stars from which such an excess was detected:...
inside" the habitable zone, along with the inner planets of e (or 82 G.) Eridani, and HD 192310 c in Capricornus. These two other systems are closer to...
R_{\odot }} . From : R = L 4 π σ T e 4 {\displaystyle R={\sqrt {\frac {L}{4\pi \sigma {T_{e}}^{4}}}}} , where L {\displaystyle L} is the luminosity, R {\displaystyle...
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