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 |
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Discov num |
HDS2185 |
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Comp |
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Coord arcsec 2000 |
15 33 56.80 -17 00 08.2 |
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Date first |
1991 |
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Date last |
2021 |
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Obs |
16 |
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Pa first |
326 |
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Pa last |
198.7 |
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P.A. Now (θ) |
198.7° |
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Sep first |
0.7 |
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Sep last |
0.47 |
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Sep. Now (ρ) |
0.47" |
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Mag pri |
8.55 |
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Mag sec |
9.78 |
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delta mag (ΔM) |
1.23 |
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Spectral class |
K0V (yellow-orange) |
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Pri motion ra |
-088 |
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Sec motion ra |
-088 |
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Pri motion dec |
-324 |
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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 |
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Constellation |
Libra |
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SAO |
159349 |
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HIP |
76203 |
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Tycho2 |
6188-00764-1 |
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Gaia DR2 |
6255498752842627584 |
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HD |
138648 |
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GC |
20912 |
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BD |
BD-16 4112 |
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Distance |
38.68 |
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Distance ly |
126.17 |
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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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