08468+0625 STF 1273 AB,C (Eps Hya)
08h 46m 46.51s +06° 25' 07.7" P.A. 311.00 sep 2.9 mag 3.49,6.66 Sp +F7V dist. 39.64 pc (129.31 l.y.)
| Coord 2000 |
08468+0625 |
|
Discov num |
STF1273 |
|
Comp |
AB,C |
|
Coord arcsec 2000 |
08 46 46.51 +06 25 07.7 |
|
| Date first |
1825 |
|
Date last |
2020 |
|
Obs |
441 |
|
| Pa first |
192 |
|
Pa last |
310.7 |
|
P.A. Now (θ) |
313.2° |
|
| Sep first |
3.3 |
|
Sep last |
2.93 |
|
Sep. Now (ρ) |
2.696" |
|
| Mag pri |
3.49 |
|
Mag sec |
6.66 |
|
delta mag (ΔM) |
3.17 |
|
Spectral class |
+F7V |
|
| Pri motion ra |
-228 |
|
Sec motion ra |
-182 |
|
| Pri motion dec |
-044 |
|
Sec motion dec |
-025 |
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
rPM=0.214 (< 0.3, Physical double)
This double is physical.
08468+0625 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
Ashlesha |
117112 |
08 46 47 +06 25 08 |
SP 1 AB |
2021 |
274 |
324 |
0.1 |
3.50 |
5.60 |
2.10 |
Y |
|
| Show |
Eps Hya |
117112 |
08 46 47 +06 25 08 |
STF 1273 AB,C |
2020 |
441 |
311 |
2.9 |
3.49 |
6.66 |
3.17 |
Y |
<=== |
| Show |
|
117112 |
08 46 47 +06 25 08 |
STF 1273 AB,D |
2017 |
23 |
201 |
18.1 |
3.49 |
12.50 |
9.01 |
|
|
| Show |
|
117112 |
08 46 47 +06 25 08 |
STF 1273 AB,E |
2015 |
8 |
2 |
340.5 |
3.49 |
10.78 |
7.29 |
|
|
| Show |
|
117112 |
08 46 47 +06 25 08 |
STF 1273 AB,F |
2015 |
9 |
265 |
406.5 |
3.49 |
10.39 |
6.90 |
|
|
Sextuple system
7 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Name |
Eps Hya |
|
Constellation |
Hydra |
|
SAO |
117112 |
|
HIP |
43109 |
|
| Tycho2 |
0224-01333-1 |
|
Gaia DR2 |
583151353573508096 |
|
HD |
74874 |
|
HR |
3482 |
|
| GC |
12102 |
|
ADS |
6993 |
|
BD |
BD+06 2036 |
|
Bayer |
Epsilon Hydrae |
|
| Bayer name |
Eps Hya |
|
Flamsteed |
11 Hydrae |
|
Flamsteed name |
11 Hya |
|
Distance |
39.64 |
|
| Distance ly |
129.31 |
|
Bayer greek |
ε Hya |
|
ORBITAL ELEMENTS
| Period (P) | 371.8983y | ± 149.7614 |
Periastron (T) | 2085.92y | ± 28.4939 |
Semi-major axis (a) | 3.09562a | ± 0.24144 |
| Eccentricity (e) | 0.47195 | ± 0.31777 |
Inclination (i) | 46.879° | ± 22.251 |
Longitude of periastron (ω) | 256.87° | ± 24.989 |
| Node (Ω) | 162.512° | ± 10.57 |
Notes | n | |
Reference | Izm2019 | |
| Equinox | | |
Last observation | 2014 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
296.4 |
2.826 |
| 2001 |
297.1 |
2.822 |
| 2002 |
297.8 |
2.818 |
| 2003 |
298.5 |
2.814 |
| 2004 |
299.2 |
2.810 |
| 2005 |
299.9 |
2.805 |
| 2006 |
300.6 |
2.801 |
| 2007 |
301.3 |
2.796 |
| 2008 |
302.1 |
2.792 |
| 2009 |
302.8 |
2.787 |
| 2010 |
303.5 |
2.782 |
| 2011 |
304.2 |
2.777 |
| 2012 |
304.9 |
2.771 |
| 2013 |
305.7 |
2.766 |
| 2014 |
306.4 |
2.760 |
| 2015 |
307.1 |
2.754 |
| 2016 |
307.9 |
2.747 |
| 2017 |
308.6 |
2.741 |
| 2018 |
309.4 |
2.734 |
| 2019 |
310.1 |
2.727 |
| 2020 |
310.9 |
2.720 |
| 2021 |
311.6 |
2.712 |
| 2022 |
312.4 |
2.704 |
| 2023 |
313.2 |
2.696 |
| 2024 |
313.9 |
2.687 |
| 2025 |
314.7 |
2.678 |
| 2026 |
315.5 |
2.669 |
| 2027 |
316.3 |
2.659 |
| 2028 |
317.1 |
2.650 |
| 2029 |
317.9 |
2.639 |
| 2030 |
318.7 |
2.628 |
|
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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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