19487+3519 STT 387 (HD 187458)
19h 48m 43.81s +35° 18' 41.3" P.A. 94.00 sep 0.5 mag 7.12,7.90 Sp F6V dist. 63.69 pc (207.76 l.y.)
| Coord 2000 |
19487+3519 |
|
Discov num |
STT 387 |
|
Comp |
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|
Coord arcsec 2000 |
19 48 43.81 +35 18 41.3 |
|
| Date first |
1843 |
|
Date last |
2020 |
|
Obs |
369 |
|
| Pa first |
118 |
|
Pa last |
94.4 |
|
P.A. Now (θ) |
88.4° |
|
| Sep first |
0.5 |
|
Sep last |
0.47 |
|
Sep. Now (ρ) |
0.426" |
|
| Mag pri |
7.12 |
|
Mag sec |
7.90 |
|
delta mag (ΔM) |
0.78 |
|
Spectral class |
F6V (yellow-white) |
|
| Pri motion ra |
+074 |
|
Sec motion ra |
+074 |
|
| Pri motion dec |
+063 |
|
Sec motion dec |
+063 |
|
| Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 187458 |
|
Constellation |
Cygnus |
|
SAO |
68893 |
|
HIP |
97477 |
|
| Tycho2 |
2677-00745-1 |
|
Gaia DR2 |
2047612532947953152 |
|
HD |
187458 |
|
HR |
7550 |
|
| GC |
27432 |
|
ADS |
12972 |
|
BD |
BD+34 3727 |
|
Distance |
63.69 |
|
| Distance ly |
207.76 |
|
ORBITAL ELEMENTS
| Period (P) | 165y | ± 1.9 |
Periastron (T) | 1870.9y | ± 6.6 |
Semi-major axis (a) | 0.641a | ± 0.004 |
| Eccentricity (e) | 0.058 | ± 0.002 |
Inclination (i) | 131.8° | ± 0.8 |
Longitude of periastron (ω) | 105° | ± 12 |
| Node (Ω) | 154.4° | ± 0.7 |
Notes | n | |
Reference | Msn2021c | |
| Equinox | | |
Last observation | 2018 | |
Grade | 2 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
140.7 |
0.614 |
| 2001 |
139.1 |
0.608 |
| 2002 |
137.5 |
0.602 |
| 2003 |
135.8 |
0.595 |
| 2004 |
134.1 |
0.587 |
| 2005 |
132.4 |
0.580 |
| 2006 |
130.6 |
0.572 |
| 2007 |
128.7 |
0.563 |
| 2008 |
126.8 |
0.555 |
| 2009 |
124.8 |
0.546 |
| 2010 |
122.8 |
0.537 |
| 2011 |
120.7 |
0.527 |
| 2012 |
118.5 |
0.518 |
| 2013 |
116.2 |
0.509 |
| 2014 |
113.9 |
0.499 |
| 2015 |
111.4 |
0.490 |
| 2016 |
108.9 |
0.481 |
| 2017 |
106.3 |
0.472 |
| 2018 |
103.6 |
0.463 |
| 2019 |
100.7 |
0.455 |
| 2020 |
97.8 |
0.447 |
| 2021 |
94.7 |
0.439 |
| 2022 |
91.6 |
0.432 |
| 2023 |
88.4 |
0.426 |
| 2024 |
85.0 |
0.420 |
| 2025 |
81.6 |
0.415 |
| 2026 |
78.1 |
0.411 |
| 2027 |
74.5 |
0.408 |
| 2028 |
70.9 |
0.405 |
| 2029 |
67.3 |
0.404 |
| 2030 |
63.6 |
0.403 |
|
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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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