17121+2114 STF 2135 AB (HD 155642)
17h 12m 06.06s +21° 13' 44.4" P.A. 194.00 sep 8.7 mag 7.59,8.88 Sp K0 dist. 152.44 pc (497.26 l.y.)
Coord 2000 |
17121+2114 |
|
Discov num |
STF2135 |
|
Comp |
AB |
|
Coord arcsec 2000 |
17 12 06.06 +21 13 44.4 |
|
Date first |
1829 |
|
Date last |
2018 |
|
Obs |
170 |
|
Pa first |
166 |
|
Pa last |
194.2 |
|
P.A. Now (θ) |
194.2° |
|
Sep first |
6.7 |
|
Sep last |
8.694 |
|
Sep. Now (ρ) |
8.694" |
|
Mag pri |
7.59 |
|
Mag sec |
8.88 |
|
delta mag (ΔM) |
1.29 |
|
Spectral class |
K0 (yellow-orange) |
|
Pri motion ra |
+022 |
|
Sec motion ra |
-001 |
|
Pri motion dec |
+002 |
|
Sec motion dec |
-011 |
|
Notes |
C
(Has orbit and linear solution) |
|
rPM=1.196
This double is physical.
17121+2114 SYSTEM COMPONENTS
Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
Show |
HD 155642 |
84910 |
17 12 06 +21 13 44 |
STF 2135 AB |
2018 |
170 |
194 |
8.7 |
7.59 |
8.88 |
1.29 |
Y |
<=== |
Show |
|
84910 |
17 12 06 +21 13 44 |
STF 2135 AC |
2015 |
7 |
208 |
162.1 |
7.59 |
12.91 |
5.32 |
|
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Triple system
3 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
Name |
HD 155642 |
|
Constellation |
Hercules |
|
SAO |
84910 |
|
HIP |
84137 |
|
Tycho2 |
1548-00181-1 |
|
Gaia DR2 |
4567068631146723456 |
|
HD |
155642 |
|
GC |
23216 |
|
BD |
BD+21 3063 |
|
Distance |
152.44 |
|
Distance ly |
497.26 |
|
ORBITAL ELEMENTS
Period (P) | 2228.9851y | ± 935.2933 |
Periastron (T) | 2283.7475y | ± 168.9042 |
Semi-major axis (a) | 23.83872a | ± 12.08057 |
Eccentricity (e) | 0.80812 | ± 0.151 |
Inclination (i) | 80.053° | ± 7.727 |
Longitude of periastron (ω) | 252.621° | ± 27.491 |
Node (Ω) | 40.759° | ± 7.512 |
Notes | | |
Reference | Izm2019 | |
Equinox | | |
Last observation | 2015 | |
Grade | 5 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
192.0 |
8.412 |
2001 |
192.2 |
8.425 |
2002 |
192.3 |
8.438 |
2003 |
192.4 |
8.452 |
2004 |
192.6 |
8.465 |
2005 |
192.7 |
8.478 |
2006 |
192.8 |
8.491 |
2007 |
192.9 |
8.504 |
2008 |
193.1 |
8.517 |
2009 |
193.2 |
8.530 |
2010 |
193.3 |
8.543 |
2011 |
193.5 |
8.555 |
2012 |
193.6 |
8.568 |
2013 |
193.7 |
8.581 |
2014 |
193.8 |
8.594 |
2015 |
194.0 |
8.607 |
2016 |
194.1 |
8.620 |
2017 |
194.2 |
8.632 |
2018 |
194.3 |
8.645 |
2019 |
194.5 |
8.658 |
2020 |
194.6 |
8.670 |
2021 |
194.7 |
8.683 |
2022 |
194.8 |
8.696 |
2023 |
195.0 |
8.708 |
2024 |
195.1 |
8.721 |
2025 |
195.2 |
8.733 |
2026 |
195.3 |
8.746 |
2027 |
195.4 |
8.758 |
2028 |
195.6 |
8.771 |
2029 |
195.7 |
8.783 |
2030 |
195.8 |
8.795 |
|
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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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