00325-6800 DON 7 (HD 2989)
00h 32m 28.68s -68° 00' 26.8" P.A. 259.00 sep 0.5 mag 10.32,10.06 Sp G5 dist. 50.74 pc (165.51 l.y.)
| Coord 2000 |
00325-6800 |
|
Discov num |
DON 7 |
|
Comp |
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Coord arcsec 2000 |
00 32 28.68 -68 00 26.8 |
|
| Date first |
1928 |
|
Date last |
2019 |
|
Obs |
5 |
|
| Pa first |
74 |
|
Pa last |
258.9 |
|
P.A. Now (θ) |
258.9° |
|
| Sep first |
0.6 |
|
Sep last |
0.538 |
|
Sep. Now (ρ) |
0.538" |
|
| Mag pri |
10.32 |
|
Mag sec |
10.06 |
|
delta mag (ΔM) |
0.26 |
|
Spectral class |
G5 (yellow) |
|
| Pri motion ra |
+106 |
|
Sec motion ra |
+106 |
|
| Pri motion dec |
+063 |
|
Sec motion dec |
+063 |
|
| Notes |
O
(Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 2989 |
|
Constellation |
Tucana |
|
HIP |
2556 |
|
Tycho2 |
9135-00172-1 |
|
| Gaia DR2 |
4703771835241607680 |
|
HD |
2989 |
|
CP |
CP-68 15 |
|
Distance |
50.74 |
|
| Distance ly |
165.51 |
|
ORBITAL ELEMENTS
| Period (P) | 150y | |
Periastron (T) | 2037.8y | |
Semi-major axis (a) | 0.608a | |
| Eccentricity (e) | 0.186 | |
Inclination (i) | 180° | |
Longitude of periastron (ω) | 337° | |
| Node (Ω) | 175° | |
Notes | | |
Reference | Tok2020e | |
| Equinox | | |
Last observation | 2019 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
309.5 |
0.630 |
| 2001 |
307.3 |
0.625 |
| 2002 |
305.0 |
0.621 |
| 2003 |
302.8 |
0.616 |
| 2004 |
300.5 |
0.611 |
| 2005 |
298.1 |
0.607 |
| 2006 |
295.7 |
0.602 |
| 2007 |
293.3 |
0.597 |
| 2008 |
290.8 |
0.592 |
| 2009 |
288.3 |
0.588 |
| 2010 |
285.8 |
0.583 |
| 2011 |
283.2 |
0.578 |
| 2012 |
280.6 |
0.573 |
| 2013 |
277.9 |
0.568 |
| 2014 |
275.2 |
0.564 |
| 2015 |
272.4 |
0.559 |
| 2016 |
269.6 |
0.554 |
| 2017 |
266.7 |
0.550 |
| 2018 |
263.8 |
0.545 |
| 2019 |
260.9 |
0.541 |
| 2020 |
257.9 |
0.537 |
| 2021 |
254.8 |
0.533 |
| 2022 |
251.7 |
0.529 |
| 2023 |
248.6 |
0.525 |
| 2024 |
245.4 |
0.521 |
| 2025 |
242.2 |
0.518 |
| 2026 |
238.9 |
0.515 |
| 2027 |
235.6 |
0.512 |
| 2028 |
232.2 |
0.509 |
| 2029 |
228.8 |
0.506 |
| 2030 |
225.4 |
0.504 |
| 2031 |
222.0 |
0.502 |
| 2032 |
218.5 |
0.500 |
| 2033 |
215.0 |
0.498 |
| 2034 |
211.5 |
0.497 |
| 2035 |
207.9 |
0.496 |
| 2036 |
204.4 |
0.495 |
| 2037 |
200.8 |
0.495 |
| 2038 |
197.3 |
0.495 |
| 2039 |
193.7 |
0.495 |
| 2040 |
190.2 |
0.496 |
| 2041 |
186.6 |
0.496 |
| 2042 |
183.1 |
0.498 |
| 2043 |
179.6 |
0.499 |
| 2044 |
176.1 |
0.501 |
| 2045 |
172.6 |
0.503 |
| 2046 |
169.2 |
0.505 |
| 2047 |
165.8 |
0.507 |
| 2048 |
162.4 |
0.510 |
| 2049 |
159.1 |
0.513 |
| 2050 |
155.8 |
0.516 |
|
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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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