Tau4 Eridani

Tau4 Eridani
Observation data Epoch J2000.0 Equinox J2000.0
Constellation	Eridanus
Right ascension	3^h 19^m 31^s
Declination	−21° 45′ 28″
Apparent magnitude (V)	3.70
Distance	258 ly (79.14 pc)
Spectral type	M3.5III
Other designations
16 Eridani, HD 20720, HR 1003, SAO 168460, FK5 , CSV 6025, BD -22 584 , HIP 15474

Tau⁴ Eridani (τ⁴ Eri, τ⁴ Eri) is a Class M3.5III, fourth-magnitude star in the constellation Eridanus. Tau⁴ Eridani is a binary star system consisting primarily of Class M components, the brightest component being a Class M giant of apparent magnitude 3.66, having a mass and luminosity many times greater than that of the Sun. It is occasionally eclipsed by other stellar components within the system in ways similar to Algol. The entire star system is located about 260 light-years from Earth.

References

"HD 20720". SIMBAD Astronomical Database. Retrieved 2006-10-29.

External links

Stars of Eridanus

Bayer	α (Achernar) β (Cursa) γ (Zaurak) δ (Rana) ε (Ran) ζ (Zibal) η (Azha) θ (Acamar) ι κ λ μ ν ξ ο¹ (Beid) π ρ¹ ρ² ρ³ τ¹ τ² (Angetenar) τ³ τ⁴ τ⁵ τ⁶ τ⁷ τ⁸ τ⁹ υ¹ (Theemin) υ² (Beemin) υ³ υ⁴ φ χ ψ ω

Flamsteed	4 5 6 7 14 15 17 20 21 22 24 25 29 30 32 35 37 39 40 (ο²) 45 46 47 51 53 (Sceptrum) 54 55 56 58 59 60 62 63 64 66 68

Variable	R RT RX RZ SV TZ UX UY XZ YY AH AQ AS BV BW CC CP CW DL DO DU DZ EF EI EK EL EM EP EX GU GW GY GZ KT

HR	486 487 506 520 573 701 789 807 814 826 827 853 859 862 875 892 895 912 913 929 935 953 955 957 968 983 997 1016 1024 1049 1050 1060 1062 1075 1076 1091 1098 1106 1108 1116 1117 1120 1125 1139 1143 1157 1182 1186 1187 1189 1190 1195 1206 1214 1219 1232 1235 1246 1249 1258 1263 1265 1267 1272 1274 1275 1293 1299 1332 1353 1359 1366 1367 1374 1384 1386 1410 1421 1431 1438 1439 1447 1450 1452 1461 1462 1476 1483 1487 1488 1495 1513 1521 1536 1545 1579 1595 1614 1625 1671

HD	11965 12894 13808 18742 19210 19850 20356 22379 24098 24834 26584 26625 27660 28185 29163 30562 30856

Gliese	Gliese 86 GJ 180 GJ 1062

Other	82 G. DEN 0255-4700 GD 50 HIP 12961 L 369-44 LHS 1723 LP 771-095 2MASS J04151954-0935066 2MASS J04390101-2353083 WASP-22 WASP-50 WASP-78 WASP-79

Former	WX (V1241 Tauri)

List

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