09320-0111 CHR 174 (Tau2 Hya)
09h 31m 58.93s -01° 11' 04.8" P.A. 357.00 sep 0.0 mag 5.10,5.70 Sp A3V dist. 158.73 pc (517.78 l.y.)
| Coord 2000 |
09320-0111 |
|
Discov num |
CHR 174 |
|
Comp |
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|
Coord arcsec 2000 |
09 31 58.93 -01 11 04.8 |
|
| Date first |
1988 |
|
Date last |
2021 |
|
Obs |
18 |
|
| Pa first |
209 |
|
Pa last |
357.3 |
|
P.A. Now (θ) |
246.8° |
|
| Sep first |
0.0 |
|
Sep last |
0.02 |
|
Sep. Now (ρ) |
0.042" |
|
| Mag pri |
5.10 |
|
Mag sec |
5.70 |
|
delta mag (ΔM) |
0.6 |
|
Spectral class |
A3V (white) |
|
| Pri motion ra |
-016 |
|
Sec motion ra |
|
|
| Pri motion dec |
-008 |
|
Sec motion dec |
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| Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
Tau2 Hya |
|
Constellation |
Hydra |
|
SAO |
136932 |
|
HIP |
46776 |
|
| Tycho2 |
4894-02528-1 |
|
Gaia DR2 |
3839656786454467072 |
|
HD |
82446 |
|
HR |
3787 |
|
| GC |
13153 |
|
BD |
BD-00 2211 |
|
Bayer |
Tau 2 Hydrae |
|
Bayer name |
Tau2 Hya |
|
| Flamsteed |
32 Hydrae |
|
Flamsteed name |
32 Hya |
|
Distance |
158.73 |
|
Distance ly |
517.78 |
|
| Bayer greek |
τ2 Hya |
|
ORBITAL ELEMENTS
| Period (P) | 6.021y | ± 0.03 |
Periastron (T) | 2015.055y | ± 0.026 |
Semi-major axis (a) | 0.032a | ± 0.001 |
| Eccentricity (e) | 0.466 | ± 0.012 |
Inclination (i) | 170.2° | ± 11.7 |
Longitude of periastron (ω) | 123.7° | ± 71.5 |
| Node (Ω) | 162° | ± 71.8 |
Notes | n | |
Reference | Tok2021f | |
| Equinox | | |
Last observation | 2021 | |
Grade | 2 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
218.0 |
0.046 |
| 2001 |
192.0 |
0.043 |
| 2002 |
153.7 |
0.031 |
| 2003 |
40.3 |
0.017 |
| 2004 |
284.8 |
0.031 |
| 2005 |
244.9 |
0.042 |
| 2006 |
218.5 |
0.046 |
| 2007 |
192.6 |
0.043 |
| 2008 |
154.9 |
0.032 |
| 2009 |
44.3 |
0.017 |
| 2010 |
286.1 |
0.030 |
| 2011 |
245.6 |
0.042 |
| 2012 |
219.0 |
0.046 |
| 2013 |
193.2 |
0.043 |
| 2014 |
156.0 |
0.032 |
| 2015 |
48.2 |
0.017 |
| 2016 |
287.3 |
0.030 |
| 2017 |
246.2 |
0.042 |
| 2018 |
219.5 |
0.046 |
| 2019 |
193.8 |
0.043 |
| 2020 |
157.1 |
0.032 |
| 2021 |
52.0 |
0.017 |
| 2022 |
288.6 |
0.030 |
| 2023 |
246.8 |
0.042 |
| 2024 |
220.1 |
0.046 |
| 2025 |
194.4 |
0.044 |
| 2026 |
158.1 |
0.033 |
| 2027 |
55.9 |
0.017 |
| 2028 |
289.9 |
0.029 |
| 2029 |
247.5 |
0.042 |
| 2030 |
220.6 |
0.046 |
|
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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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