23024+1837 HU 398 (HD 217716)
23h 02m 22.68s +18° 36' 31.9" P.A. 300.00 sep 0.5 mag 9.58,10.04 Sp G8.7V+G6V dist. 127.71 pc (416.59 l.y.)
| Coord 2000 |
23024+1837 |
|
Discov num |
HU 398 |
|
Comp |
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Coord arcsec 2000 |
23 02 22.68 +18 36 31.9 |
|
| Date first |
1901 |
|
Date last |
2021 |
|
Obs |
64 |
|
| Pa first |
322 |
|
Pa last |
300.2 |
|
P.A. Now (θ) |
297.1° |
|
| Sep first |
0.4 |
|
Sep last |
0.484 |
|
Sep. Now (ρ) |
0.49" |
|
| Mag pri |
9.58 |
|
Mag sec |
10.04 |
|
delta mag (ΔM) |
0.46 |
|
Spectral class |
G8.7V+G6V (yellow/yellow) |
|
| Pri motion ra |
-034 |
|
Sec motion ra |
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| Pri motion dec |
-016 |
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Sec motion dec |
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| Notes |
O
(Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 217716 |
|
Constellation |
Pegasus |
|
SAO |
108354 |
|
HIP |
113768 |
|
| Tycho2 |
1714-00944-1 |
|
Gaia DR2 |
2831005844661242496 |
|
HD |
217716 |
|
ADS |
16463 |
|
| BD |
BD+17 4853 |
|
Distance |
127.71 |
|
Distance ly |
416.59 |
|
ORBITAL ELEMENTS
| Period (P) | 152.7y | |
Periastron (T) | 1957.87y | |
Semi-major axis (a) | 0.313a | |
| Eccentricity (e) | 0.591 | |
Inclination (i) | 5.7° | |
Longitude of periastron (ω) | 3.7° | |
| Node (Ω) | 121.9° | |
Notes | | |
Reference | Hrt2014b | |
| Equinox | 2000 | |
Last observation | 2010 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
277.1 |
0.423 |
| 2001 |
278.1 |
0.427 |
| 2002 |
279.1 |
0.432 |
| 2003 |
280.1 |
0.436 |
| 2004 |
281.0 |
0.440 |
| 2005 |
282.0 |
0.444 |
| 2006 |
282.9 |
0.447 |
| 2007 |
283.8 |
0.451 |
| 2008 |
284.7 |
0.454 |
| 2009 |
285.6 |
0.458 |
| 2010 |
286.5 |
0.461 |
| 2011 |
287.4 |
0.464 |
| 2012 |
288.2 |
0.467 |
| 2013 |
289.1 |
0.470 |
| 2014 |
289.9 |
0.472 |
| 2015 |
290.7 |
0.475 |
| 2016 |
291.6 |
0.477 |
| 2017 |
292.4 |
0.479 |
| 2018 |
293.2 |
0.482 |
| 2019 |
294.0 |
0.484 |
| 2020 |
294.8 |
0.485 |
| 2021 |
295.6 |
0.487 |
| 2022 |
296.3 |
0.489 |
| 2023 |
297.1 |
0.490 |
| 2024 |
297.9 |
0.491 |
| 2025 |
298.6 |
0.493 |
| 2026 |
299.4 |
0.494 |
| 2027 |
300.2 |
0.495 |
| 2028 |
300.9 |
0.496 |
| 2029 |
301.7 |
0.496 |
| 2030 |
302.4 |
0.497 |
|
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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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