11210-5429 I 879 (Pi Cen)
11h 21m 00.40s -54° 29' 27.7" P.A. 113.00 sep 0.3 mag 4.08,5.65 Sp B5Vn dist. 109.65 pc (357.68 l.y.)
Coord 2000 |
11210-5429 |
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Discov num |
I 879 |
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Comp |
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Coord arcsec 2000 |
11 21 00.40 -54 29 27.7 |
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Date first |
1910 |
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Date last |
2019 |
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Obs |
59 |
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Pa first |
140 |
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Pa last |
113.1 |
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P.A. Now (θ) |
119.2° |
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Sep first |
0.5 |
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Sep last |
0.329 |
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Sep. Now (ρ) |
0.378" |
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Mag pri |
4.08 |
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Mag sec |
5.65 |
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delta mag (ΔM) |
1.57 |
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Spectral class |
B5Vn (blue-white) |
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Pri motion ra |
-040 |
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Sec motion ra |
-040 |
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Pri motion dec |
-003 |
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Sec motion dec |
-003 |
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Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
Pi Cen |
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Constellation |
Centaurus |
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SAO |
238986 |
|
HIP |
55425 |
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Tycho2 |
8621-02002-1 |
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Gaia DR2 |
5346659311958869248 |
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HD |
98718 |
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HR |
4390 |
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GC |
15601 |
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CP |
CP-53 4498 |
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Bayer |
Pi Centauri |
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Bayer name |
Pi Cen |
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FK5 |
428 |
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Distance |
109.65 |
|
Distance ly |
357.68 |
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Bayer greek |
π Cen |
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ORBITAL ELEMENTS
Period (P) | 39y | ± 0.19 |
Periastron (T) | 2010.41y | ± 0.037 |
Semi-major axis (a) | 0.2263a | ± 0.0011 |
Eccentricity (e) | 0.853 | ± 0.004 |
Inclination (i) | 19.4° | ± 4.9 |
Longitude of periastron (ω) | 340.3° | ± 4 |
Node (Ω) | 327.8° | ± 3.9 |
Notes | n | |
Reference | Tok2012b | |
Equinox | 2000 | |
Last observation | 2012 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
142.6 |
0.356 |
2001 |
144.5 |
0.340 |
2002 |
146.7 |
0.323 |
2003 |
149.0 |
0.303 |
2004 |
151.8 |
0.280 |
2005 |
155.0 |
0.254 |
2006 |
159.1 |
0.224 |
2007 |
164.5 |
0.190 |
2008 |
172.6 |
0.150 |
2009 |
187.6 |
0.102 |
2010 |
237.8 |
0.045 |
2011 |
33.1 |
0.056 |
2012 |
71.4 |
0.108 |
2013 |
85.5 |
0.152 |
2014 |
93.5 |
0.190 |
2015 |
98.9 |
0.223 |
2016 |
103.1 |
0.251 |
2017 |
106.4 |
0.277 |
2018 |
109.2 |
0.299 |
2019 |
111.6 |
0.319 |
2020 |
113.8 |
0.337 |
2021 |
115.8 |
0.353 |
2022 |
117.6 |
0.366 |
2023 |
119.2 |
0.378 |
2024 |
120.8 |
0.388 |
2025 |
122.3 |
0.397 |
2026 |
123.8 |
0.404 |
2027 |
125.2 |
0.409 |
2028 |
126.6 |
0.413 |
2029 |
127.9 |
0.416 |
2030 |
129.3 |
0.417 |
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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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