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 |
|
Discov num |
I 879 |
|
Comp |
|
|
Coord arcsec 2000 |
11 21 00.40 -54 29 27.7 |
|
| Date first |
1910 |
|
Date last |
2019 |
|
Obs |
59 |
|
| Pa first |
140 |
|
Pa last |
113.1 |
|
P.A. Now (θ) |
119.2° |
|
| Sep first |
0.5 |
|
Sep last |
0.329 |
|
Sep. Now (ρ) |
0.378" |
|
| Mag pri |
4.08 |
|
Mag sec |
5.65 |
|
delta mag (ΔM) |
1.57 |
|
Spectral class |
B5Vn (blue-white) |
|
| Pri motion ra |
-040 |
|
Sec motion ra |
-040 |
|
| Pri motion dec |
-003 |
|
Sec motion dec |
-003 |
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
Pi Cen |
|
Constellation |
Centaurus |
|
SAO |
238986 |
|
HIP |
55425 |
|
| Tycho2 |
8621-02002-1 |
|
Gaia DR2 |
5346659311958869248 |
|
HD |
98718 |
|
HR |
4390 |
|
| GC |
15601 |
|
CP |
CP-53 4498 |
|
Bayer |
Pi Centauri |
|
Bayer name |
Pi Cen |
|
| FK5 |
428 |
|
Distance |
109.65 |
|
Distance ly |
357.68 |
|
Bayer greek |
π Cen |
|
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 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
|
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|
|
|
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|
Measures: green=micrometric, blue=interferometric, purple=photographic |
|
WDS 11210-5429 I 879 (Pi Cen) : NOTES
| discov_num |
notes |
refcode |
| I 879 |
pi Cen. |
|
|
The spectral lines are very poor; the RV range of 30km/s is probably |
|
|
mere scatter. A few more speckle obs needed to constrain eccentricity. |
|
|
1976.474: This system was observed within a few months of periastron. |
BLM1978 |
|
Hipparcos parallax 9.12 +/- 0.34 mas. Dynamical parallax 9.1 mas, |
|
|
masses 6.43 and 3.68 Msun. The orbit by Mason et al. (1999) had to be |
Msn1999a |
|
revised using our measures near the periastron. The high eccentricity |
|
|
e = 0.853 is now well established. |
Tok2012b |
|
Malkov et al. (2012) derive dynamical, photometric, and spectroscopic |
|
|
masses of 15.29 +/- 3.02, 8.37, and 4.79 Msun, respectively. |
Mlk2012 |
REFERENCES
| refcode |
metd |
author |
reference |
| BLM1978 |
S j |
Morgan, B.L., Beddoes, D.R., Scaddan, R.J. & Dainty, J.C. |
1978MNRAS.183..701M |
| BLM1978 |
|
MNRAS 183, 701, 1978 |
|
| Mlk2012 |
not - |
Malkov, O.Yu., Tamazian, V.S., Docobo, J.A., & Chulkov, D.A. |
2012A&A...546A..69M |
| Mlk2012 |
|
A&A 546, A69, 2012 |
|
| Msn1999a |
Su j |
Mason, B.D., Douglass, G.G., & Hartkopf, W.I. |
1999AJ....117.1023M |
| Msn1999a |
+orb |
AJ 117, 1023, 1999 |
|
| Tok2012b |
S j |
Tokovinin, A. |
2012AJ....144...56T |
| Tok2012b |
+orb |
AJ 144, 56, 2012 |
|
DISCOVERER
| idgroup |
discov |
author |
| 1 |
I |
Innes, R.T.A. |
| 5 |
I |
MNRAS 57, 533, 1897 (data also in I__1897b, |
| 5 |
I |
I__1897c) |
WDS HISTORIC DATA
| coord_2000 |
discov_num |
comp |
epoch |
obs |
pa |
sep |
mag_pri |
mag_sec |
spectr |
notes |
coord_arcsec_2000 |
| 11210-5429 |
I 879 |
|
2006 |
51 |
159 |
0.2 |
4.08 |
5.65 |
B5Vn |
NOD |
112100.40-542927.7 |
| 11210-5429 |
I 879 |
|
2011 |
52 |
218 |
0.1 |
4.08 |
5.65 |
B5Vn |
NOD |
112100.40-542927.7 |
| 11210-5429 |
I 879 |
|
2012 |
53 |
254 |
0.1 |
4.08 |
5.65 |
B5Vn |
NOD |
112100.40-542927.7 |
| 11210-5429 |
I 879 |
|
2013 |
54 |
266 |
0.2 |
4.08 |
5.65 |
B5Vn |
NOD |
112100.40-542927.7 |
| 11210-5429 |
I 879 |
|
2014 |
56 |
94 |
0.2 |
4.08 |
5.65 |
B5Vn |
NO |
112100.40-542927.7 |
| 11210-5429 |
I 879 |
|
2015 |
57 |
100 |
0.2 |
4.08 |
5.65 |
B5Vn |
NO |
112100.40-542927.7 |
| 11210-5429 |
I 879 |
|
2018 |
58 |
110 |
0.3 |
4.08 |
5.65 |
B5Vn |
NO |
112100.40-542927.7 |
| 11210-5429 |
I 879 |
|
2019 |
59 |
113 |
0.3 |
4.08 |
5.65 |
B5Vn |
NO |
112100.40-542927.7 |
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WDS 11210-5429 I 879 (Pi Cen) : VISUAL OBSERVATIONS REPORTS
No records found.
WDS 11210-5429 I 879 (Pi Cen) : MEASURES
No records found.
WDS 11210-5429 (Pi Cen) : VIRTUAL EYEPIECE
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WDS 11210-5429 (Pi Cen) : ALADIN DSS IMAGE @
Error -22130
Not valid ID.
Error -22130
Not valid ID.
Error -27220
Not valid ID.
