18096+0609 STF 2283 (HD 166257)
18h 09m 34.22s +06° 08' 44.6" P.A. 48.00 sep 0.5 mag 8.25,8.73 Sp F5V dist. 130.55 pc (425.85 l.y.)
Coord 2000 |
18096+0609 |
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Discov num |
STF2283 |
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Comp |
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Coord arcsec 2000 |
18 09 34.22 +06 08 44.6 |
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Date first |
1829 |
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Date last |
2018 |
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Obs |
132 |
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Pa first |
93 |
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Pa last |
47.7 |
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P.A. Now (θ) |
47.7° |
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Sep first |
1.2 |
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Sep last |
0.54 |
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Sep. Now (ρ) |
0.54" |
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Mag pri |
8.25 |
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Mag sec |
8.73 |
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delta mag (ΔM) |
0.48 |
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Spectral class |
F5V (yellow-white) |
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Pri motion ra |
-008 |
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Sec motion ra |
-008 |
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Pri motion dec |
-033 |
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Sec motion dec |
-033 |
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Notes |
O
(Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
HD 166257 |
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Constellation |
Ophiuchus |
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SAO |
123189 |
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HIP |
88965 |
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Tycho2 |
0443-02788-1 |
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Gaia DR2 |
4471859857717152896 |
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HD |
166257 |
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GC |
24756 |
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ADS |
11110 |
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BD |
BD+06 3638 |
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Distance |
130.55 |
|
Distance ly |
425.85 |
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ORBITAL ELEMENTS
Period (P) | 2112.6541y | ± 1028.0629 |
Periastron (T) | 2179.5587y | ± 422.9152 |
Semi-major axis (a) | 3.45289a | ± 2.15588 |
Eccentricity (e) | 0.93271 | ± 0.10674 |
Inclination (i) | 101.638° | ± 12.326 |
Longitude of periastron (ω) | 244.13° | ± 37.661 |
Node (Ω) | 136.654° | ± 32.742 |
Notes | | |
Reference | Izm2019 | |
Equinox | | |
Last observation | 2011 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
58.1 |
0.638 |
2001 |
57.7 |
0.635 |
2002 |
57.4 |
0.632 |
2003 |
57.0 |
0.629 |
2004 |
56.6 |
0.626 |
2005 |
56.2 |
0.623 |
2006 |
55.9 |
0.620 |
2007 |
55.5 |
0.617 |
2008 |
55.1 |
0.614 |
2009 |
54.7 |
0.612 |
2010 |
54.3 |
0.609 |
2011 |
53.9 |
0.606 |
2012 |
53.5 |
0.603 |
2013 |
53.1 |
0.601 |
2014 |
52.7 |
0.598 |
2015 |
52.3 |
0.595 |
2016 |
51.8 |
0.593 |
2017 |
51.4 |
0.590 |
2018 |
51.0 |
0.587 |
2019 |
50.6 |
0.585 |
2020 |
50.1 |
0.582 |
2021 |
49.7 |
0.580 |
2022 |
49.3 |
0.577 |
2023 |
48.8 |
0.575 |
2024 |
48.4 |
0.572 |
2025 |
47.9 |
0.570 |
2026 |
47.4 |
0.568 |
2027 |
47.0 |
0.565 |
2028 |
46.5 |
0.563 |
2029 |
46.1 |
0.561 |
2030 |
45.6 |
0.558 |
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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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