16171+5516 BLA 3 (CR Dra)
16h 17m 05.38s +55° 16' 09.0" P.A. 9.00 sep 0.1 mag 10.20,11.90 Sp M1.5Ve dist. 20.53 pc (66.97 l.y.)
| Coord 2000 |
16171+5516 |
|
Discov num |
BLA 3 |
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Comp |
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Coord arcsec 2000 |
16 17 05.38 +55 16 09.0 |
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| Date first |
1986 |
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Date last |
2019 |
|
Obs |
15 |
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| Pa first |
36 |
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Pa last |
8.5 |
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P.A. Now (θ) |
25.3° |
|
| Sep first |
0.1 |
|
Sep last |
0.097 |
|
Sep. Now (ρ) |
0.105" |
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| Mag pri |
10.20 |
|
Mag sec |
11.90 |
|
delta mag (ΔM) |
1.7 |
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Spectral class |
M1.5Ve (red) |
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| Pri motion ra |
+088 |
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Sec motion ra |
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| Pri motion dec |
-431 |
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Sec motion dec |
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| Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Var name |
CR Dra |
|
Constellation |
Draco |
|
HIP |
79796 |
|
Tycho2 |
3880-02179-1 |
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| GL |
Gl 616.2 |
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BD |
BD+55 1823 |
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Distance |
20.53 |
|
Distance ly |
66.97 |
|
ORBITAL ELEMENTS
| Period (P) | 4.04y | ± 0.005 |
Periastron (T) | 2005.72y | ± 0.005 |
Semi-major axis (a) | 0.148a | ± 0.002 |
| Eccentricity (e) | 0.17 | ± 0.002 |
Inclination (i) | 119.5° | ± 1 |
Longitude of periastron (ω) | 299.9° | ± 2 |
| Node (Ω) | 63.5° | ± 1.5 |
Notes | n | |
Reference | Tam2008 | |
| Equinox | 2000 | |
Last observation | 2007 | |
Grade | 2 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
264.6 |
0.144 |
| 2001 |
220.5 |
0.115 |
| 2002 |
73.8 |
0.121 |
| 2003 |
5.3 |
0.090 |
| 2004 |
266.5 |
0.141 |
| 2005 |
223.3 |
0.120 |
| 2006 |
76.5 |
0.117 |
| 2007 |
9.8 |
0.093 |
| 2008 |
268.4 |
0.138 |
| 2009 |
225.8 |
0.125 |
| 2010 |
79.3 |
0.113 |
| 2011 |
14.1 |
0.096 |
| 2012 |
270.5 |
0.134 |
| 2013 |
228.1 |
0.130 |
| 2014 |
82.4 |
0.108 |
| 2015 |
18.1 |
0.099 |
| 2016 |
272.6 |
0.131 |
| 2017 |
230.3 |
0.135 |
| 2018 |
85.8 |
0.103 |
| 2019 |
21.8 |
0.102 |
| 2020 |
274.9 |
0.127 |
| 2021 |
232.3 |
0.139 |
| 2022 |
89.6 |
0.097 |
| 2023 |
25.3 |
0.105 |
| 2024 |
277.3 |
0.123 |
| 2025 |
234.2 |
0.143 |
| 2026 |
93.8 |
0.092 |
| 2027 |
28.6 |
0.109 |
| 2028 |
279.9 |
0.119 |
| 2029 |
236.0 |
0.146 |
| 2030 |
98.6 |
0.086 |
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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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