21579-5500 FIN 307 (Del Ind)
21h 57m 55.03s -54° 59' 33.2" P.A. 222.00 sep 0.1 mag 4.80,5.96 Sp F0IV dist. 57.67 pc (188.12 l.y.)
| Coord 2000 |
21579-5500 |
|
Discov num |
FIN 307 |
|
Comp |
|
|
Coord arcsec 2000 |
21 57 55.03 -54 59 33.2 |
|
| Date first |
1927 |
|
Date last |
2020 |
|
Obs |
317 |
|
| Pa first |
0 |
|
Pa last |
222.3 |
|
P.A. Now (θ) |
266.9° |
|
| Sep first |
0.2 |
|
Sep last |
0.052 |
|
Sep. Now (ρ) |
0.17" |
|
| Mag pri |
4.80 |
|
Mag sec |
5.96 |
|
delta mag (ΔM) |
1.16 |
|
Spectral class |
F0IV (yellow-white) |
|
| Pri motion ra |
+048 |
|
Sec motion ra |
|
|
| Pri motion dec |
-007 |
|
Sec motion dec |
|
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
Del Ind |
|
Constellation |
Indus |
|
SAO |
247244 |
|
HIP |
108431 |
|
| Tycho2 |
8812-01257-1 |
|
Gaia DR2 |
6413081274731392256 |
|
HD |
208450 |
|
HR |
8368 |
|
| GC |
30720 |
|
CP |
CP-55 9733 |
|
Bayer |
Delta Indi |
|
Bayer name |
Del Ind |
|
| FK5 |
824 |
|
Distance |
57.67 |
|
Distance ly |
188.12 |
|
Bayer greek |
δ Ind |
|
ORBITAL ELEMENTS
| Period (P) | 12.237y | ± 0.08 |
Periastron (T) | 2007.518y | ± 0.48 |
Semi-major axis (a) | 0.176a | ± 0.004 |
| Eccentricity (e) | 0.032 | ± 0.032 |
Inclination (i) | 76.3° | ± 2 |
Longitude of periastron (ω) | 64.9° | ± 11 |
| Node (Ω) | 90.8° | ± 2 |
Notes | n | |
Reference | Doc2013d | |
| Equinox | 2000 | |
Last observation | 2009 | |
Grade | 1 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
277.4 |
0.163 |
| 2001 |
288.8 |
0.113 |
| 2002 |
328.5 |
0.050 |
| 2003 |
56.8 |
0.072 |
| 2004 |
78.7 |
0.135 |
| 2005 |
87.7 |
0.171 |
| 2006 |
95.1 |
0.165 |
| 2007 |
105.9 |
0.117 |
| 2008 |
144.2 |
0.050 |
| 2009 |
239.3 |
0.073 |
| 2010 |
260.1 |
0.139 |
| 2011 |
268.6 |
0.175 |
| 2012 |
275.6 |
0.170 |
| 2013 |
285.2 |
0.127 |
| 2014 |
312.2 |
0.063 |
| 2015 |
44.4 |
0.058 |
| 2016 |
75.6 |
0.121 |
| 2017 |
85.9 |
0.166 |
| 2018 |
93.3 |
0.170 |
| 2019 |
102.5 |
0.131 |
| 2020 |
127.9 |
0.064 |
| 2021 |
226.8 |
0.057 |
| 2022 |
257.2 |
0.125 |
| 2023 |
266.9 |
0.170 |
| 2024 |
273.9 |
0.175 |
| 2025 |
282.3 |
0.140 |
| 2026 |
301.7 |
0.078 |
| 2027 |
25.1 |
0.047 |
| 2028 |
71.6 |
0.107 |
| 2029 |
84.0 |
0.158 |
| 2030 |
91.5 |
0.173 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
|
|
|
|
|
|
|
|
Measures: green=micrometric, blue=interferometric, purple=photographic |
|
WDS 21579-5500 FIN 307 (Del Ind) : NOTES
| discov_num |
notes |
refcode |
| FIN 307 |
del Ind. |
|
|
Finsen called attention to quasi-periodic residuals in position |
|
|
angle which neither of the alternative orbits explains. |
|
|
Illustrative solutions with useable astrometric mass-ratios. Short-P |
|
|
solution marginally better, but indeterminate with strong element- |
|
|
correlations. Probably giant primary, more speckle-data needed. |
Sod1999 |
|
Malkov et al. (2012) derive dynamical, photometric, and spectroscopic |
|
|
masses of 5.24 +/- 0.83, 3.26, and 1.58 Msun, respectively. |
Mlk2012 |
|
Docobo & Andrade (2013) derive a dynamical parallax of 22.71 +/- 0.69 |
|
|
mas and component masses 1.78 +/- 0.21 and 1.33 +/- 0.16 Msun. See |
|
|
paper for extensive notes on this system. |
Doc2013d |
REFERENCES
| refcode |
metd |
author |
reference |
| Doc2013d |
orb - |
Docobo, J.A. & Andrade, M. |
2013MNRAS.428..321D |
| Doc2013d |
|
MNRAS 428, 321, 2013 |
|
| Mlk2012 |
not - |
Malkov, O.Yu., Tamazian, V.S., Docobo, J.A., & Chulkov, D.A. |
2012A&A...546A..69M |
| Mlk2012 |
|
A&A 546, A69, 2012 |
|
| Sod1999 |
orb - |
Soderhjelm, S. |
1999A&A...341..121S |
| Sod1999 |
|
A&A 341, 121, 1999 |
|
DISCOVERER
| idgroup |
discov |
author |
| 1 |
FIN |
Finsen, W.S. |
WDS HISTORIC DATA
| coord_2000 |
discov_num |
comp |
epoch |
obs |
pa |
sep |
mag_pri |
mag_sec |
spectr |
notes |
coord_arcsec_2000 |
| 21579-5500 |
FIN 307 |
|
1991 |
308 |
80 |
0.1 |
4.80 |
5.96 |
F0IV |
NO |
215755.03-545933.2 |
| 21579-5500 |
FIN 307 |
|
2008 |
316 |
50 |
0.1 |
4.80 |
5.96 |
F0IV |
NO |
215755.03-545933.2 |
| 21579-5500 |
FIN 307 |
|
2009 |
317 |
75 |
0.1 |
4.80 |
5.96 |
F0IV |
NOD |
215755.03-545933.2 |
| 21579-5500 |
FIN 307 |
|
2012 |
314 |
290 |
0.1 |
4.80 |
5.96 |
F0IV |
NO |
215755.03-545933.2 |
| 21579-5500 |
FIN 307 |
|
2017 |
315 |
94 |
0.2 |
4.80 |
5.96 |
F0IV |
NO |
215755.03-545933.2 |
| 21579-5500 |
FIN 307 |
|
2018 |
316 |
106 |
0.1 |
4.80 |
5.96 |
F0IV |
NO |
215755.03-545933.2 |
| 21579-5500 |
FIN 307 |
|
2020 |
317 |
222 |
0.1 |
4.80 |
5.96 |
F0IV |
NO |
215755.03-545933.2 |
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WDS 21579-5500 FIN 307 (Del Ind) : VISUAL OBSERVATIONS REPORTS
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WDS 21579-5500 FIN 307 (Del Ind) : MEASURES
No records found.
WDS 21579-5500 (Del Ind) : VIRTUAL EYEPIECE
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WDS 21579-5500 (Del Ind) : ALADIN DSS IMAGE @
Error -22130
Not valid ID.
Error -22130
Not valid ID.
Error -27220
Not valid ID.
