18261+0047 BU 1203 (HD 169725)
18h 26m 03.38s +00° 46' 49.7" P.A. 157.00 sep 0.5 mag 7.11,8.73 Sp A7III dist. 134.77 pc (439.62 l.y.)
Coord 2000 |
18261+0047 |
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Discov num |
BU 1203 |
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Comp |
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Coord arcsec 2000 |
18 26 03.38 +00 46 49.7 |
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Date first |
1890 |
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Date last |
2018 |
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Obs |
100 |
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Pa first |
68 |
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Pa last |
157.3 |
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P.A. Now (θ) |
157.3° |
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Sep first |
0.3 |
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Sep last |
0.507 |
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Sep. Now (ρ) |
0.507" |
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Mag pri |
7.11 |
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Mag sec |
8.73 |
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delta mag (ΔM) |
1.62 |
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Spectral class |
A7III (white) |
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Pri motion ra |
+017 |
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Sec motion ra |
+017 |
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Pri motion dec |
+008 |
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Sec motion dec |
+008 |
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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 169725 |
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Constellation |
Serpens |
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SAO |
123471 |
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HIP |
90347 |
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Tycho2 |
0433-00027-1 |
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Gaia DR2 |
4276317590229462400 |
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HD |
169725 |
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GC |
25158 |
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ADS |
11339 |
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BD |
BD+00 3931 |
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Distance |
134.77 |
|
Distance ly |
439.62 |
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ORBITAL ELEMENTS
Period (P) | 495.73y | |
Periastron (T) | 2315.02y | |
Semi-major axis (a) | 0.5151a | |
Eccentricity (e) | 0.4634 | |
Inclination (i) | 59.29° | |
Longitude of periastron (ω) | 317.13° | |
Node (Ω) | 17.64° | |
Notes | n | |
Reference | Pop1996b | |
Equinox | 2000 | |
Last observation | 1991 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
151.6 |
0.454 |
2001 |
152.0 |
0.456 |
2002 |
152.4 |
0.459 |
2003 |
152.8 |
0.462 |
2004 |
153.2 |
0.464 |
2005 |
153.6 |
0.467 |
2006 |
154.0 |
0.470 |
2007 |
154.4 |
0.473 |
2008 |
154.8 |
0.475 |
2009 |
155.2 |
0.478 |
2010 |
155.6 |
0.480 |
2011 |
155.9 |
0.483 |
2012 |
156.3 |
0.486 |
2013 |
156.7 |
0.488 |
2014 |
157.0 |
0.491 |
2015 |
157.4 |
0.494 |
2016 |
157.8 |
0.496 |
2017 |
158.1 |
0.499 |
2018 |
158.5 |
0.501 |
2019 |
158.8 |
0.504 |
2020 |
159.1 |
0.507 |
2021 |
159.5 |
0.509 |
2022 |
159.8 |
0.512 |
2023 |
160.1 |
0.514 |
2024 |
160.5 |
0.517 |
2025 |
160.8 |
0.519 |
2026 |
161.1 |
0.522 |
2027 |
161.4 |
0.524 |
2028 |
161.8 |
0.527 |
2029 |
162.1 |
0.529 |
2030 |
162.4 |
0.532 |
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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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