Coord 2000 | 20311+1548 |
Discov num | A 1675 |
Comp | Coord arcsec 2000 | 20 31 06.12 +15 48 27.5 |
|||||
Date first | 1907 |
Date last | 2018 |
Obs | 84 |
||||||
Pa first | 327 |
Pa last | 301 |
P.A. Now (θ) | 297.3° |
||||||
Sep first | 0.2 |
Sep last | 0.1 |
Sep. Now (ρ) | 0.14" |
||||||
Mag pri | 7.14 |
Mag sec | 8.65 |
delta mag (ΔM) | 1.51 |
Spectral class | A2V (white) |
||||
Pri motion ra | -003 |
Sec motion ra | |||||||||
Pri motion dec | -009 |
Sec motion dec | |||||||||
Notes |
Precise pa | 301.3 |
Precise sep | 0.139 |
Constellation | Delphinus |
SAO | 106194 |
||||
HIP | 101223 |
Tycho2 | 1632-01088-1 |
Gaia DR2 | 37932800896 |
HD | 195481 |
||||
ADS | 13944 |
BD | BD+15 4181 |
Distance | 168.92 |
Distance ly | 551.02 |
||||
last precise pa | 301.3 |
last precise sep | 0.139 |
Period (P) | 49.62y | Periastron (T) | 1947.75y | Semi-major axis (a) | 0.145a | |||
Eccentricity (e) | 0.568 | Inclination (i) | 109.4° | Longitude of periastron (ω) | 60.2° | |||
Node (Ω) | 142.6° | Note | Grade | 2 | (1=Definitive, 9=Indet.) | |||
Equinox | 2000 | Last observation | 1994 |
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st. |
|
|
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|
![]() Measures: green=micrometric, blue=interferometric, purple=photographic |
|
coord_2000 | discov_num | comp | epoch | obs | pa | sep | mag_pri | mag_sec | spectr | notes | coord_arcsec_2000 |
20311+1548 | A 1675 | 1994 | 80 | 148 | 0.1 | 7.14 | 8.65 | A2V | NOD | 203106.12+154827.5 | |
20311+1548 | A 1675 | 2006 | 81 | 323 | 0.1 | 7.14 | 8.65 | A2V | NOD | 203106.12+154827.5 | |
20311+1548 | A 1675 | 2015 | 83 | 306 | 0.2 | 7.14 | 8.65 | A2V | NO | 203106.12+154827.5 | |
20311+1548 | A 1675 | 2018 | 84 | 301 | 0.1 | 7.14 | 8.65 | A2V | NO | 203106.12+154827.5 |