Coord 2000 | 18386+1632 | Discov num | HO 87 | Comp | AB | Coord arcsec 2000 | 18 38 36.74 +16 32 27.7 | ||||
Date first | 1883 | Date last | 2019 | Obs | 115 | ||||||
Pa first | 259 | Pa last | 95.6 | P.A. Now (θ) | 99.5° | ||||||
Sep first | 0.3 | Sep last | 0.45 | Sep. Now (ρ) | 0.446" | ||||||
Mag pri | 8.34 | Mag sec | 8.98 | delta mag (ΔM) | 0.64 | Spectral class | G5 (yellow) | ||||
Pri motion ra | -051 | Sec motion ra | |||||||||
Pri motion dec | -063 | Sec motion dec | |||||||||
Notes | N O (See Notes, Orbital solution) |
Show | name | SAO | coord | wds_name | last | obs | pa | sep | mag1 | mag2 | d_mag | orb | current |
Show | HD 172246 | 103945 | 18 38 37 +16 32 28 | HO 87 AB | 2019 | 115 | 96 | 0.4 | 8.34 | 8.98 | 0.64 | Y | <=== |
Show | 103945 | 18 38 37 +16 32 28 | HO 87 AC | 2015 | 9 | 121 | 47.3 | 8.34 | 14.17 | 5.83 |
Name | HD 172246 | Constellation | Hercules | SAO | 103945 | HIP | 91413 | ||||
Tycho2 | 1570-02103-1 | Gaia DR2 | 4511604454282166912 | HD | 172246 | ADS | 11530 | ||||
BD | BD+16 3572 | Distance | 128.7 | Distance ly | 419.82 |
Period (P) | 119.39y | Periastron (T) | 1972.37y | Semi-major axis (a) | 0.299a | |||
Eccentricity (e) | 0.599 | Inclination (i) | 19.6° | Longitude of periastron (ω) | 78.8° | |||
Node (Ω) | 210.5° | Notes | n | Reference | Msn2019 | |||
Equinox | 2000 | Last observation | 2019 | Grade | 2 | (1=Definitive, 9=Indet.) |
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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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