| Coord 2000 | 20231+2052 |
Discov num | A 288 |
Comp | Coord arcsec 2000 | 20 23 08.98 +20 51 51.1 |
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| Date first | 1901 |
Date last | 2012 |
Obs | 42 |
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| Pa first | 352 |
Pa last | 296 |
P.A. Now (θ) | 308.9° |
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| Sep first | 0.3 |
Sep last | 0.2 |
Sep. Now (ρ) | 0.23" |
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| Mag pri | 8.72 |
Mag sec | 8.98 |
delta mag (ΔM) | 0.26 |
Spectral class | F2 (yellow-white) |
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| Pri motion ra | +012 |
Sec motion ra | |||||||||
| Pri motion dec | +005 |
Sec motion dec | |||||||||
| Notes | |||||||||||
| Precise pa | 295.6 |
Precise sep | 0.196 |
Constellation | Delphinus |
SAO | 88610 |
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| HIP | 100536 |
Tycho2 | 1643-02278-1 |
HD | 194113 |
ADS | 13777 |
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| BD | BD+20 4541 |
Distance | 251.89 |
Distance ly | 821.67 |
last precise pa | 295.6 |
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| last precise sep | 0.196 |
| Period (P) | 163.2y | Periastron (T) | 1979.2y | Semi-major axis (a) | 0.206a | |||
| Eccentricity (e) | 0.533 | Inclination (i) | 30° | Longitude of periastron (ω) | 138.6° | |||
| Node (Ω) | 24.5° | Note | Grade | 3 | (1=Definitive, 9=Indet.) | |||
| Equinox | Last observation | 1991 |
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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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| coord_2000 | discov_num | comp | epoch | obs | pa | sep | mag_pri | mag_sec | spectr | notes | coord_arcsec_2000 |
| 20231+2052 | A 288 | 1998 | 38 | 87 | 0.2 | 8.72 | 8.98 | F2 | NO | 202308.98+205151.1 | |
| 20231+2052 | A 288 | 2006 | 39 | 279 | 0.2 | 8.72 | 8.98 | F2 | NO | 202308.98+205151.1 |