00164-7024 HEI 198 (HD 1261)
00h 16m 24.38s -70° 23' 32.6" P.A. 178.00 sep 0.1 mag 7.80,8.26 Sp F8V dist. 193.05 pc (629.73 l.y.)
| Coord 2000 |
00164-7024 |
|
Discov num |
HEI 198 |
|
Comp |
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Coord arcsec 2000 |
00 16 24.38 -70 23 32.6 |
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| Date first |
1983 |
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Date last |
2021 |
|
Obs |
12 |
|
| Pa first |
128 |
|
Pa last |
177.9 |
|
P.A. Now (θ) |
177.9° |
|
| Sep first |
0.2 |
|
Sep last |
0.113 |
|
Sep. Now (ρ) |
0.113" |
|
| Mag pri |
7.80 |
|
Mag sec |
8.26 |
|
delta mag (ΔM) |
0.46 |
|
Spectral class |
F8V (yellow-white) |
|
| Pri motion ra |
-001 |
|
Sec motion ra |
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|
| Pri motion dec |
+002 |
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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 1261 |
|
Constellation |
Tucana |
|
SAO |
255651 |
|
HIP |
1309 |
|
| Tycho2 |
9137-00628-1 |
|
Gaia DR2 |
4702206375497204992 |
|
HD |
1261 |
|
GC |
319 |
|
| CP |
CP-71 4 |
|
Distance |
193.05 |
|
Distance ly |
629.73 |
|
ORBITAL ELEMENTS
| Period (P) | 63.3y | ± 30.8 |
Periastron (T) | 2010.7y | ± 2.7 |
Semi-major axis (a) | 0.166a | ± 0.072 |
| Eccentricity (e) | 0.42 | ± 0.15 |
Inclination (i) | 121.6° | ± 15 |
Longitude of periastron (ω) | 210° | ± 25.5 |
| Node (Ω) | 153.2° | ± 10.6 |
Notes | | |
Reference | Tok2017b | |
| Equinox | 2000 | |
Last observation | | |
Grade | 5 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
44.7 |
0.087 |
| 2001 |
34.8 |
0.087 |
| 2002 |
25.2 |
0.089 |
| 2003 |
16.1 |
0.092 |
| 2004 |
7.7 |
0.095 |
| 2005 |
359.8 |
0.099 |
| 2006 |
352.4 |
0.102 |
| 2007 |
345.3 |
0.103 |
| 2008 |
338.2 |
0.102 |
| 2009 |
330.9 |
0.099 |
| 2010 |
322.8 |
0.093 |
| 2011 |
313.3 |
0.084 |
| 2012 |
301.5 |
0.074 |
| 2013 |
286.1 |
0.065 |
| 2014 |
266.5 |
0.059 |
| 2015 |
244.8 |
0.059 |
| 2016 |
225.0 |
0.065 |
| 2017 |
209.6 |
0.075 |
| 2018 |
198.3 |
0.088 |
| 2019 |
190.0 |
0.102 |
| 2020 |
183.7 |
0.115 |
| 2021 |
178.6 |
0.129 |
| 2022 |
174.5 |
0.141 |
| 2023 |
171.1 |
0.153 |
| 2024 |
168.1 |
0.164 |
| 2025 |
165.5 |
0.174 |
| 2026 |
163.1 |
0.182 |
| 2027 |
161.0 |
0.190 |
| 2028 |
159.0 |
0.198 |
| 2029 |
157.2 |
0.204 |
| 2030 |
155.4 |
0.209 |
|
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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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