Coord 2000 | 04153-0739 | Discov num | STF 518 | Comp | BC | Coord arcsec 2000 | 04 15 21.79 -07 39 29.1 | ||||
Date first | 1851 | Date last | 2019 | Obs | 184 | ||||||
Pa first | 160 | Pa last | 330.4 | P.A. Now (θ) | 329.3° | ||||||
Sep first | 3.0 | Sep last | 8.172 | Sep. Now (ρ) | 7.938" | ||||||
Mag pri | 9.53 | Mag sec | 11.17 | delta mag (ΔM) | 1.64 | Spectral class | DA2.9+M5V (white dwarf/red) | ||||
Pri motion ra | -223 | Sec motion ra | -225 | ||||||||
Pri motion dec | -338 | Sec motion dec | -341 | ||||||||
Notes | N O P (See Notes, Orbital solution, 100-year proper motion) |
Show | name | SAO | coord | wds_name | last | obs | pa | sep | mag1 | mag2 | d_mag | orb | current |
Show | Keid | 131063 | 04 15 16 -07 39 10 | STF 518 A,BC | 2019 | 107 | 102 | 82.7 | 4.43 | 9.31 | 4.88 | ||
Show | 131063 | 04 15 16 -07 39 10 | STF 518 AC | 2019 | 8 | 97 | 77.5 | 4.43 | 11.17 | 6.74 | |||
Show | 131063 | 04 15 16 -07 39 10 | STF 518 AD | 1998 | 17 | 38 | 481.4 | 4.43 | 12.62 | 8.19 | |||
Show | 131063 | 04 15 16 -07 39 10 | STF 518 AE | 1998 | 11 | 24 | 569.9 | 4.43 | 12.99 | 8.56 | |||
Show | 04 15 22 -07 39 29 | STF 518 BC | 2019 | 184 | 330 | 8.2 | 9.53 | 11.17 | 1.64 | Y | <=== | ||
Show | 04 15 22 -07 39 29 | STF 518 BD | 2014 | 4 | 28 | 456.3 | 9.53 | 12.62 | 3.09 | ||||
Show | 04 15 22 -07 39 29 | STF 518 BE | 2014 | 4 | 16 | 563.4 | 9.53 | 12.99 | 3.46 |
Constellation | Eridanus | Tycho2 | 5313-00183-1 | HD | 26976 | GC | 5140 | ||||
ADS | 3093 | Bayer | Omicron 2 Eridani | Bayer name | Omi2 Eri | Flamsteed | 40 Eridani | ||||
Flamsteed name | 40 Eri | Bayer greek | ο2 Eri |
Period (P) | 233.2y | ± 0.65 | Periastron (T) | 1848.78888y | ± 1.28888 | Semi-major axis (a) | 6.88788a | ± 0.03488 |
Eccentricity (e) | 0.4141 | ± 0.0072 | Inclination (i) | 107.98° | ± 0.36 | Longitude of periastron (ω) | 321.2° | ± 1.3 |
Node (Ω) | 151.58° | ± 0.2 | Notes | n | Reference | WSI2021 | ||
Equinox | Last observation | 2019 | Grade | 3 | (1=Definitive, 9=Indet.) |
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Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st. |
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Measures: green=micrometric, blue=interferometric, purple=photographic |
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