01541-7729 JSP 31 (HD 12121)
01h 54m 06.06s -77° 29' 28.5" P.A. 52.00 sep 0.3 mag 7.55,8.25 Sp A8IV/V dist. 147.93 pc (482.55 l.y.)
| Coord 2000 |
01541-7729 |
|
Discov num |
JSP 31 |
|
Comp |
|
|
Coord arcsec 2000 |
01 54 06.06 -77 29 28.5 |
|
| Date first |
1929 |
|
Date last |
2016 |
|
Obs |
8 |
|
| Pa first |
354 |
|
Pa last |
52.2 |
|
P.A. Now (θ) |
52.2° |
|
| Sep first |
0.2 |
|
Sep last |
0.311 |
|
Sep. Now (ρ) |
0.311" |
|
| Mag pri |
7.55 |
|
Mag sec |
8.25 |
|
delta mag (ΔM) |
0.7 |
|
Spectral class |
A8IV/V (white) |
|
| Pri motion ra |
+012 |
|
Sec motion ra |
|
|
| Pri motion dec |
+039 |
|
Sec motion dec |
|
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 12121 |
|
Constellation |
Hydrus |
|
SAO |
255831 |
|
HIP |
8866 |
|
| Tycho2 |
9352-01737-1 |
|
HD |
12121 |
|
GC |
2337 |
|
CP |
CP-78 40 |
|
| Distance |
147.93 |
|
Distance ly |
482.55 |
|
ORBITAL ELEMENTS
| 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° | |
Notes | | |
Reference | Tok2017c | |
| Equinox | 2000 | |
Last observation | 2016 | |
Grade | 5 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
81.3 |
0.162 |
| 2001 |
78.1 |
0.170 |
| 2002 |
75.3 |
0.178 |
| 2003 |
72.7 |
0.187 |
| 2004 |
70.3 |
0.195 |
| 2005 |
68.1 |
0.204 |
| 2006 |
66.1 |
0.213 |
| 2007 |
64.3 |
0.222 |
| 2008 |
62.6 |
0.231 |
| 2009 |
61.1 |
0.240 |
| 2010 |
59.6 |
0.250 |
| 2011 |
58.3 |
0.259 |
| 2012 |
57.0 |
0.268 |
| 2013 |
55.8 |
0.277 |
| 2014 |
54.7 |
0.286 |
| 2015 |
53.7 |
0.294 |
| 2016 |
52.7 |
0.303 |
| 2017 |
51.8 |
0.312 |
| 2018 |
51.0 |
0.321 |
| 2019 |
50.1 |
0.329 |
| 2020 |
49.4 |
0.338 |
| 2021 |
48.6 |
0.346 |
| 2022 |
47.9 |
0.354 |
| 2023 |
47.2 |
0.362 |
| 2024 |
46.6 |
0.371 |
| 2025 |
46.0 |
0.378 |
| 2026 |
45.4 |
0.386 |
| 2027 |
44.8 |
0.394 |
| 2028 |
44.3 |
0.402 |
| 2029 |
43.7 |
0.409 |
| 2030 |
43.2 |
0.417 |
| 2031 |
42.7 |
0.424 |
| 2032 |
42.3 |
0.431 |
| 2033 |
41.8 |
0.438 |
| 2034 |
41.3 |
0.445 |
| 2035 |
40.9 |
0.452 |
| 2036 |
40.5 |
0.458 |
| 2037 |
40.1 |
0.465 |
| 2038 |
39.7 |
0.471 |
| 2039 |
39.3 |
0.478 |
| 2040 |
38.9 |
0.484 |
| 2041 |
38.6 |
0.490 |
| 2042 |
38.2 |
0.496 |
| 2043 |
37.9 |
0.502 |
| 2044 |
37.5 |
0.508 |
| 2045 |
37.2 |
0.513 |
| 2046 |
36.9 |
0.519 |
| 2047 |
36.5 |
0.524 |
| 2048 |
36.2 |
0.529 |
| 2049 |
35.9 |
0.534 |
| 2050 |
35.6 |
0.539 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
|
|
|
|
|
|
|
|
Measures: green=micrometric, blue=interferometric, purple=photographic |
|
