04422+2257 MCA 16 Aa,Ab
04h 42m 14.70s +22° 57' 25.1" P.A. 36.00 sep 0.3 mag 4.33,6.97 Sp B3V dist. 122.1 pc (398.29 l.y.)
| Coord 2000 |
04422+2257 |
|
Discov num |
MCA 16 |
|
Comp |
Aa,Ab |
|
Coord arcsec 2000 |
04 42 14.70 +22 57 25.1 |
|
| Date first |
1980 |
|
Date last |
2007 |
|
Obs |
37 |
|
| Pa first |
204 |
|
Pa last |
36.1 |
|
P.A. Now (θ) |
356.2° |
|
| Sep first |
0.2 |
|
Sep last |
0.336 |
|
Sep. Now (ρ) |
0.318" |
|
| Mag pri |
4.33 |
|
Mag sec |
6.97 |
|
delta mag (ΔM) |
2.64 |
|
Spectral class |
B3V (blue-white) |
|
| Pri motion ra |
-002 |
|
Sec motion ra |
|
|
| Pri motion dec |
-016 |
|
Sec motion dec |
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|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
04422+2257 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
|
76721 |
04 42 15 +22 57 25 |
MCA 16 Aa,Ab |
2007 |
37 |
36 |
0.3 |
4.33 |
6.97 |
2.64 |
Y |
<=== |
| Show |
Tau Tau |
76721 |
04 42 15 +22 57 25 |
S 455 AB |
2017 |
46 |
214 |
62.5 |
4.24 |
7.02 |
2.78 |
|
|
Triple system
2 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Constellation |
Taurus |
|
SAO |
76721 |
|
HIP |
21881 |
|
Tycho2 |
1830-02129-1 |
|
| Gaia DR2 |
146483849656094464 |
|
HD |
29763 |
|
HR |
1497 |
|
GC |
5716 |
|
| BD |
BD+22 739 |
|
Bayer |
Tau Tauri |
|
Bayer name |
Tau Tau |
|
Flamsteed |
94 Tauri |
|
| Flamsteed name |
94 Tau |
|
FK5 |
174 |
|
Distance |
122.1 |
|
Distance ly |
398.29 |
|
| Bayer greek |
τ Tau |
|
ORBITAL ELEMENTS
| Period (P) | 57.896y | ± 0.3 |
Periastron (T) | 2037.956y | ± 0.048 |
Semi-major axis (a) | 0.284a | ± 0.0079 |
| Eccentricity (e) | 0.357 | ± 0.0663 |
Inclination (i) | 130.7° | ± 3.38 |
Longitude of periastron (ω) | 142.2° | ± 11.54 |
| Node (Ω) | 4.1° | ± 8.14 |
Notes | n | |
Reference | Cve2010e | |
| Equinox | 2000 | |
Last observation | 2005 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
61.8 |
0.256 |
| 2001 |
57.3 |
0.267 |
| 2002 |
53.2 |
0.278 |
| 2003 |
49.4 |
0.288 |
| 2004 |
45.8 |
0.298 |
| 2005 |
42.5 |
0.308 |
| 2006 |
39.4 |
0.318 |
| 2007 |
36.4 |
0.326 |
| 2008 |
33.6 |
0.334 |
| 2009 |
31.0 |
0.341 |
| 2010 |
28.4 |
0.347 |
| 2011 |
25.9 |
0.353 |
| 2012 |
23.5 |
0.357 |
| 2013 |
21.1 |
0.360 |
| 2014 |
18.7 |
0.362 |
| 2015 |
16.4 |
0.363 |
| 2016 |
14.1 |
0.362 |
| 2017 |
11.8 |
0.360 |
| 2018 |
9.4 |
0.357 |
| 2019 |
7.0 |
0.352 |
| 2020 |
4.5 |
0.346 |
| 2021 |
1.8 |
0.338 |
| 2022 |
359.1 |
0.329 |
| 2023 |
356.2 |
0.318 |
| 2024 |
353.0 |
0.305 |
| 2025 |
349.6 |
0.291 |
| 2026 |
345.8 |
0.275 |
| 2027 |
341.4 |
0.257 |
| 2028 |
336.4 |
0.238 |
| 2029 |
330.5 |
0.218 |
| 2030 |
323.4 |
0.197 |
|
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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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