20216+2346 STF 2672 (HD 193817)
20h 21m 36.19s +23° 45' 50.6" P.A. 350.00 sep 0.6 mag 9.34,9.60 Sp F8
Coord 2000 |
20216+2346 |
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Discov num |
STF2672 |
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Comp |
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Coord arcsec 2000 |
20 21 36.19 +23 45 50.6 |
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Date first |
1831 |
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Date last |
2016 |
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Obs |
97 |
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Pa first |
278 |
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Pa last |
350.1 |
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P.A. Now (θ) |
350.1° |
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Sep first |
1.1 |
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Sep last |
0.648 |
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Sep. Now (ρ) |
0.648" |
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Mag pri |
9.34 |
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Mag sec |
9.60 |
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delta mag (ΔM) |
0.26 |
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Spectral class |
F8 (yellow-white) |
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Pri motion ra |
+011 |
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Sec motion ra |
+011 |
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Pri motion dec |
+006 |
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Sec motion dec |
+006 |
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Notes |
O
(Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
HD 193817 |
|
Constellation |
Vulpecula |
|
SAO |
88567 |
|
Tycho2 |
2155-00709-1 |
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Gaia DR2 |
1831879040092466944 |
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HD |
193817 |
|
GC |
28316 |
|
ADS |
13750 |
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ORBITAL ELEMENTS
Period (P) | 764y | |
Periastron (T) | 2121.6y | |
Semi-major axis (a) | 0.898a | |
Eccentricity (e) | 0.436 | |
Inclination (i) | 41.4° | |
Longitude of periastron (ω) | 41° | |
Node (Ω) | 40.6° | |
Notes | | |
Reference | Lin2019c | |
Equinox | 2000 | |
Last observation | 2016 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
339.6 |
0.668 |
2001 |
340.1 |
0.667 |
2002 |
340.7 |
0.666 |
2003 |
341.3 |
0.664 |
2004 |
341.9 |
0.663 |
2005 |
342.5 |
0.662 |
2006 |
343.0 |
0.660 |
2007 |
343.6 |
0.659 |
2008 |
344.2 |
0.658 |
2009 |
344.8 |
0.657 |
2010 |
345.4 |
0.656 |
2011 |
346.0 |
0.654 |
2012 |
346.6 |
0.653 |
2013 |
347.2 |
0.652 |
2014 |
347.8 |
0.651 |
2015 |
348.4 |
0.650 |
2016 |
349.0 |
0.649 |
2017 |
349.6 |
0.648 |
2018 |
350.3 |
0.646 |
2019 |
350.9 |
0.645 |
2020 |
351.5 |
0.644 |
2021 |
352.1 |
0.643 |
2022 |
352.7 |
0.642 |
2023 |
353.4 |
0.641 |
2024 |
354.0 |
0.640 |
2025 |
354.6 |
0.639 |
2026 |
355.2 |
0.638 |
2027 |
355.9 |
0.637 |
2028 |
356.5 |
0.636 |
2029 |
357.1 |
0.635 |
2030 |
357.8 |
0.634 |
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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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