20467+1607 STF 2727 AB (Gam2 Del)
20h 46m 39.50s +16° 07' 27.4" P.A. 266.00 sep 8.8 mag 4.36,5.03 Sp K1IV+F7V dist. 38.73 pc (126.34 l.y.)
| Coord 2000 |
20467+1607 |
|
Discov num |
STF2727 |
|
Comp |
AB |
|
Coord arcsec 2000 |
20 46 39.50 +16 07 27.4 |
|
| Date first |
1755 |
|
Date last |
2022 |
|
Obs |
546 |
|
| Pa first |
280 |
|
Pa last |
265.6 |
|
P.A. Now (θ) |
266° |
|
| Sep first |
12.0 |
|
Sep last |
8.84 |
|
Sep. Now (ρ) |
8.82" |
|
| Mag pri |
4.36 |
|
Mag sec |
5.03 |
|
delta mag (ΔM) |
0.67 |
|
Spectral class |
K1IV+F7V (yellow-orange/yellow-white) |
|
| Pri motion ra |
-026 |
|
Sec motion ra |
-001 |
|
| Pri motion dec |
-196 |
|
Sec motion dec |
-204 |
|
| Notes |
N
O
Z
(See Notes, Orbital solution, Parallax indicates components are physical) |
|
rPM=0.129 (< 0.3, Physical double)
This double is physical.
20467+1607 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
Gam2 Del |
106477 |
20 46 40 +16 07 27 |
STF 2727 AB |
2022 |
546 |
266 |
8.8 |
4.36 |
5.03 |
0.67 |
Y |
<=== |
| Show |
|
106477 |
20 46 40 +16 07 27 |
FYM 18 AD |
2011 |
2 |
323 |
109.4 |
4.36 |
16.20 |
11.84 |
|
|
Triple system
3 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Name |
Gam2 Del |
|
Constellation |
Delphinus |
|
SAO |
106477 |
|
HIP |
102532 |
|
| Tycho2 |
1634-03056-1 |
|
Gaia DR2 |
1763000413341086464 |
|
HD |
197964 |
|
HR |
7947 |
|
| GC |
28965 |
|
ADS |
14279 |
|
BD |
BD+15 4255 |
|
Bayer |
Gamma 2 Delphini |
|
| Bayer name |
Gam2 Del |
|
Flamsteed |
12 Delphini |
|
Flamsteed name |
12 Del |
|
FK5 |
1541 |
|
| Distance |
38.73 |
|
Distance ly |
126.34 |
|
Bayer greek |
γ2 Del |
|
ORBITAL ELEMENTS
| Period (P) | 3249y | |
Periastron (T) | 2305y | |
Semi-major axis (a) | 10.22a | |
| Eccentricity (e) | 0.88 | |
Inclination (i) | 148.78° | |
Longitude of periastron (ω) | 331.16° | |
| Node (Ω) | ° | |
Notes | n | |
Reference | Hle1994 | |
| Equinox | 2000 | |
Last observation | 1993 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
177.8 |
9.267 |
| 2001 |
177.8 |
9.248 |
| 2002 |
177.7 |
9.229 |
| 2003 |
177.7 |
9.209 |
| 2004 |
177.6 |
9.190 |
| 2005 |
177.5 |
9.171 |
| 2006 |
177.5 |
9.151 |
| 2007 |
177.4 |
9.132 |
| 2008 |
177.4 |
9.112 |
| 2009 |
177.3 |
9.093 |
| 2010 |
177.3 |
9.073 |
| 2011 |
177.2 |
9.054 |
| 2012 |
177.2 |
9.034 |
| 2013 |
177.1 |
9.014 |
| 2014 |
177.0 |
8.995 |
| 2015 |
177.0 |
8.975 |
| 2016 |
176.9 |
8.955 |
| 2017 |
176.9 |
8.935 |
| 2018 |
176.8 |
8.915 |
| 2019 |
176.7 |
8.895 |
| 2020 |
176.7 |
8.875 |
| 2021 |
176.6 |
8.855 |
| 2022 |
176.6 |
8.835 |
| 2023 |
176.5 |
8.815 |
| 2024 |
176.4 |
8.795 |
| 2025 |
176.4 |
8.775 |
| 2026 |
176.3 |
8.755 |
| 2027 |
176.3 |
8.735 |
| 2028 |
176.2 |
8.714 |
| 2029 |
176.1 |
8.694 |
| 2030 |
176.1 |
8.674 |
| 2031 |
176.0 |
8.653 |
| 2032 |
175.9 |
8.633 |
| 2033 |
175.9 |
8.612 |
| 2034 |
175.8 |
8.592 |
| 2035 |
175.8 |
8.571 |
| 2036 |
175.7 |
8.550 |
| 2037 |
175.6 |
8.530 |
| 2038 |
175.6 |
8.509 |
| 2039 |
175.5 |
8.488 |
| 2040 |
175.4 |
8.468 |
| 2041 |
175.4 |
8.447 |
| 2042 |
175.3 |
8.426 |
| 2043 |
175.2 |
8.405 |
| 2044 |
175.2 |
8.384 |
| 2045 |
175.1 |
8.363 |
| 2046 |
175.0 |
8.342 |
| 2047 |
175.0 |
8.321 |
| 2048 |
174.9 |
8.299 |
| 2049 |
174.8 |
8.278 |
| 2050 |
174.8 |
8.257 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
Measures: green=micrometric, blue=interferometric, purple=photographic
|
|
