15339-1700 HDS 2185 (HD 138648)
15h 33m 56.80s -17° 00' 08.2" P.A. 199.00 sep 0.5 mag 8.55,9.78 Sp K0V dist. 38.68 pc (126.17 l.y.)
| Coord 2000 |
15339-1700 |
|
Discov num |
HDS2185 |
|
Comp |
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Coord arcsec 2000 |
15 33 56.80 -17 00 08.2 |
|
| Date first |
1991 |
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Date last |
2021 |
|
Obs |
16 |
|
| Pa first |
326 |
|
Pa last |
198.7 |
|
P.A. Now (θ) |
198.7° |
|
| Sep first |
0.7 |
|
Sep last |
0.47 |
|
Sep. Now (ρ) |
0.47" |
|
| Mag pri |
8.55 |
|
Mag sec |
9.78 |
|
delta mag (ΔM) |
1.23 |
|
Spectral class |
K0V (yellow-orange) |
|
| Pri motion ra |
-088 |
|
Sec motion ra |
-088 |
|
| Pri motion dec |
-324 |
|
Sec motion dec |
-324 |
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| Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 138648 |
|
Constellation |
Libra |
|
SAO |
159349 |
|
HIP |
76203 |
|
| Tycho2 |
6188-00764-1 |
|
Gaia DR2 |
6255498752842627584 |
|
HD |
138648 |
|
GC |
20912 |
|
| BD |
BD-16 4112 |
|
Distance |
38.68 |
|
Distance ly |
126.17 |
|
ORBITAL ELEMENTS
| Period (P) | 72.32y | ± 2.2 |
Periastron (T) | 2010.26y | ± 0.1 |
Semi-major axis (a) | 0.5757a | ± 0.0069 |
| Eccentricity (e) | 0.414 | ± 0.012 |
Inclination (i) | 34.6° | ± 1 |
Longitude of periastron (ω) | 310.3° | ± 1.1 |
| Node (Ω) | 150.6° | ± 1.1 |
Notes | n | |
Reference | Tok2017b | |
| Equinox | 2000 | |
Last observation | | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
357.3 |
0.487 |
| 2001 |
2.9 |
0.457 |
| 2002 |
9.2 |
0.426 |
| 2003 |
16.6 |
0.396 |
| 2004 |
25.1 |
0.366 |
| 2005 |
35.1 |
0.339 |
| 2006 |
46.7 |
0.316 |
| 2007 |
59.9 |
0.299 |
| 2008 |
74.2 |
0.291 |
| 2009 |
88.8 |
0.292 |
| 2010 |
102.9 |
0.301 |
| 2011 |
116.0 |
0.315 |
| 2012 |
127.8 |
0.333 |
| 2013 |
138.3 |
0.352 |
| 2014 |
147.8 |
0.371 |
| 2015 |
156.4 |
0.388 |
| 2016 |
164.3 |
0.403 |
| 2017 |
171.6 |
0.417 |
| 2018 |
178.5 |
0.430 |
| 2019 |
185.0 |
0.443 |
| 2020 |
191.1 |
0.454 |
| 2021 |
197.0 |
0.465 |
| 2022 |
202.5 |
0.476 |
| 2023 |
207.8 |
0.488 |
| 2024 |
212.9 |
0.499 |
| 2025 |
217.8 |
0.510 |
| 2026 |
222.4 |
0.522 |
| 2027 |
226.9 |
0.533 |
| 2028 |
231.1 |
0.545 |
| 2029 |
235.2 |
0.557 |
| 2030 |
239.1 |
0.569 |
|
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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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