Coord 2000 | 01541-7729 |
Discov num | JSP 31 |
Comp | Coord arcsec 2000 | 01 54 06.06 -77 29 28.5 |
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Date first | 1929 |
Date last | 2016 |
Obs | 8 |
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Pa first | 354 |
Pa last | 52 |
P.A. Now (θ) | 49.4° |
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Sep first | 0.2 |
Sep last | 0.3 |
Sep. Now (ρ) | 0.34" |
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Mag pri | 7.55 |
Mag sec | 8.25 |
delta mag (ΔM) | 0.7 |
Spectral class | A8IV/V (white) |
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Pri motion ra | +012 |
Sec motion ra | |||||||||
Pri motion dec | +039 |
Sec motion dec | |||||||||
Notes |
Precise pa | 52.2 |
Precise sep | 0.311 |
Constellation | Hydrus |
SAO | 255831 |
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HIP | 8866 |
Tycho2 | 9352-01737-1 |
HD | 12121 |
CP | CP-78 40 |
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Distance | 147.93 |
Distance ly | 482.55 |
last precise pa | 52.2 |
last precise sep | 0.311 |
Period (P) | 250y | Periastron (T) | 1968.23y | Semi-major axis (a) | 0.43a | |||
Eccentricity (e) | 0.5 | Inclination (i) | 112.1° | Longitude of periastron (ω) | 180.1° | |||
Node (Ω) | 25.5° | Note | Grade | 5 | (1=Definitive, 9=Indet.) | |||
Equinox | 2000 | Last observation | 2016 |
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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coord_2000 | discov_num | comp | epoch | obs | pa | sep | mag_pri | mag_sec | spectr | notes | coord_arcsec_2000 |
01541-7729 | JSP 31 | 1991 | 7 | 122 | 0.1 | 7.55 | 8.25 | A8IV/V | N | 015406.06-772928.5 | |
01541-7729 | JSP 31 | 2016 | 8 | 52 | 0.3 | 7.55 | 8.25 | A8IV/V | NO | 015406.06-772928.5 |