12490+6607 DEL 4 (DP Dra)
12h 49m 02.75s +66° 06' 36.7" P.A. 221.00 sep 0.3 mag 6.80,6.80 Sp M3 dist. 10.21 pc (33.31 l.y.)
| Coord 2000 |
12490+6607 |
|
Discov num |
DEL 4 |
|
Comp |
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Coord arcsec 2000 |
12 49 02.75 +66 06 36.7 |
|
| Date first |
1997 |
|
Date last |
2019 |
|
Obs |
10 |
|
| Pa first |
240 |
|
Pa last |
221.4 |
|
P.A. Now (θ) |
20.1° |
|
| Sep first |
0.2 |
|
Sep last |
0.269 |
|
Sep. Now (ρ) |
0.273" |
|
| Mag pri |
6.80 |
|
Mag sec |
6.80 |
|
delta mag (ΔM) |
0 |
|
Spectral class |
M3 (red) |
|
| Pri motion ra |
-438 |
|
Sec motion ra |
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| Pri motion dec |
-101 |
|
Sec motion dec |
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| Notes |
O
K
(Orbital solution, K-band or other infrared magnitudes) |
|
Visually invisible, K-band or other infrared star : Summary line gives K-band or other infrared (>1 micron) magnitudes
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Var name |
DP Dra |
|
Constellation |
Draco |
|
HIP |
62556 |
|
GL |
Gl 487 |
|
| Distance |
10.21 |
|
Distance ly |
33.31 |
|
ORBITAL ELEMENTS
| Period (P) | 7.307817y | |
Periastron (T) | 2009.262199y | |
Semi-major axis (a) | 0.33498a | |
| Eccentricity (e) | 0.426987 | |
Inclination (i) | 76.1171° | |
Longitude of periastron (ω) | 83.3857° | |
| Node (Ω) | 21.9262° | |
Notes | | |
Reference | Kpp2020f | |
| Equinox | | |
Last observation | | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
3.1 |
0.244 |
| 2001 |
18.9 |
0.280 |
| 2002 |
110.1 |
0.046 |
| 2003 |
203.0 |
0.297 |
| 2004 |
215.1 |
0.301 |
| 2005 |
235.2 |
0.192 |
| 2006 |
300.2 |
0.115 |
| 2007 |
355.9 |
0.210 |
| 2008 |
14.4 |
0.289 |
| 2009 |
37.4 |
0.138 |
| 2010 |
198.1 |
0.248 |
| 2011 |
211.3 |
0.318 |
| 2012 |
226.9 |
0.231 |
| 2013 |
272.7 |
0.121 |
| 2014 |
345.8 |
0.173 |
| 2015 |
9.8 |
0.277 |
| 2016 |
26.0 |
0.226 |
| 2017 |
189.2 |
0.163 |
| 2018 |
207.7 |
0.321 |
| 2019 |
220.9 |
0.266 |
| 2020 |
251.6 |
0.147 |
| 2021 |
330.3 |
0.139 |
| 2022 |
4.6 |
0.252 |
| 2023 |
20.1 |
0.273 |
| 2024 |
147.7 |
0.057 |
| 2025 |
204.0 |
0.305 |
| 2026 |
216.2 |
0.295 |
| 2027 |
237.8 |
0.183 |
| 2028 |
307.1 |
0.117 |
| 2029 |
357.9 |
0.219 |
| 2030 |
15.5 |
0.289 |
|
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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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