Coord 2000 | 00446-1856 | Discov num | HDS 99 | Comp | Aa,Ab | Coord arcsec 2000 | 00 44 37.15 -18 56 48.2 | ||||
Date first | 1991 | Date last | 2021 | Obs | 15 | ||||||
Pa first | 13 | Pa last | 315.6 | P.A. Now (θ) | 273.6° | ||||||
Sep first | 0.2 | Sep last | 0.11 | Sep. Now (ρ) | 0.166" | ||||||
Mag pri | 11.46 | Mag sec | 11.74 | delta mag (ΔM) | 0.28 | Spectral class | dM2 | ||||
Pri motion ra | +271 | Sec motion ra | |||||||||
Pri motion dec | +183 | 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 | 00 44 37 -18 56 48 | HDS 99 Aa,Ab | 2021 | 15 | 316 | 0.1 | 11.46 | 11.74 | 0.28 | Y | <=== | ||
Show | 00 44 37 -18 56 48 | LDS 3195 AB | 2007 | 6 | 242 | 146.6 | 10.93 | 10.42 | 0.51 | ||||
Show | 00 44 37 -18 56 48 | LDS 3195 AC | 2015 | 7 | 240 | 35.4 | 10.74 | 15.90 | 5.16 |
Constellation | Cetus | HIP | 3493 | Tycho2 | 5849-00610-1 | GL | Gl 31.2A | ||||
BD | BD-19 111 | Distance | 31.44 | Distance ly | 102.56 |
Period (P) | 8.667y | ± 0.065 | Periastron (T) | 2011.977y | ± 0.023 | Semi-major axis (a) | 132.4m | ± 1.2 |
Eccentricity (e) | 0.493 | ± 0.01 | Inclination (i) | 171.5° | ± 6.6 | Longitude of periastron (ω) | 8° | ± 26 |
Node (Ω) | 66° | ± 25 | Notes | n | Reference | Hor2017 | ||
Equinox | 2000 | Last observation | 2015 | 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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