13100+1732 STF 1728 AB (Diadem)
13h 09m 59.28s +17° 31' 46.0" P.A. 195.00 sep 0.5 mag 4.85,5.53 Sp F5V+F6V dist. 17.83 pc (58.16 l.y.)
Coord 2000 |
13100+1732 |
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Discov num |
STF1728 |
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Comp |
AB |
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Coord arcsec 2000 |
13 09 59.28 +17 31 46.0 |
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Date first |
1827 |
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Date last |
2020 |
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Obs |
664 |
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Pa first |
190 |
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Pa last |
194.6 |
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P.A. Now (θ) |
192.1° |
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Sep first |
0.6 |
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Sep last |
0.46 |
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Sep. Now (ρ) |
0.278" |
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Mag pri |
4.85 |
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Mag sec |
5.53 |
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delta mag (ΔM) |
0.68 |
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Spectral class |
F5V+F6V (yellow-white/yellow-white) |
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Pri motion ra |
-433 |
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Sec motion ra |
-430 |
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Pri motion dec |
+141 |
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Sec motion dec |
+138 |
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Notes |
N
O
(See Notes, Orbital solution) |
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rPM=0.009 (< 0.3, Physical double)
This double is physical.
13100+1732 SYSTEM COMPONENTS
Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
Show |
Diadem |
100443 |
13 09 59 +17 31 46 |
STF 1728 AB |
2020 |
664 |
195 |
0.5 |
4.85 |
5.53 |
0.68 |
Y |
<=== |
Show |
Alp Com |
100443 |
13 09 59 +17 31 46 |
STF 1728 AB,C |
2014 |
14 |
349 |
84.8 |
4.43 |
11.45 |
7.02 |
|
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Triple system
4 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
Common name |
Diadem |
|
Var name |
NSV6116 Com |
|
Constellation |
Coma Berenices |
|
SAO |
100443 |
|
HIP |
64241 |
|
Tycho2 |
1454-01134-1 |
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HD |
114378 |
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HR |
4968 |
|
GC |
17833 |
|
ADS |
8804 |
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GL |
Gl 501A |
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BD |
BD+18 2697 |
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Bayer |
Alpha Comae Berenices |
|
Bayer name |
Alp Com |
|
Flamsteed |
42 Comae Berenices |
|
Flamsteed name |
42 Com |
|
Distance |
17.83 |
|
Distance ly |
58.16 |
|
Bayer greek |
α Com |
|
ORBITAL ELEMENTS
Period (P) | 9442.4d (25.85y) | ± 3 |
Periastron (T) | 57056.84m (2015.094y) | ± 0.36 |
Semi-major axis (a) | 0.67144a | ± 0.00033 |
Eccentricity (e) | 0.5106 | ± 0.00061 |
Inclination (i) | 90.0501° | ± 0.0062 |
Longitude of periastron (ω) | 100.563° | ± 0.026 |
Node (Ω) | 12.2272° | ± 0.0098 |
Notes | n | |
Reference | Mut2015 | |
Equinox | 2000 | |
Last observation | 2015 | |
Grade | 1 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
189.3 |
0.017 |
2001 |
12.9 |
0.078 |
2002 |
12.5 |
0.171 |
2003 |
12.4 |
0.261 |
2004 |
12.4 |
0.346 |
2005 |
12.3 |
0.426 |
2006 |
12.3 |
0.497 |
2007 |
12.3 |
0.558 |
2008 |
12.3 |
0.605 |
2009 |
12.3 |
0.635 |
2010 |
12.3 |
0.643 |
2011 |
12.2 |
0.621 |
2012 |
12.2 |
0.558 |
2013 |
12.2 |
0.437 |
2014 |
12.2 |
0.238 |
2015 |
192.7 |
0.034 |
2016 |
192.3 |
0.288 |
2017 |
192.2 |
0.443 |
2018 |
192.2 |
0.509 |
2019 |
192.2 |
0.515 |
2020 |
192.2 |
0.484 |
2021 |
192.2 |
0.430 |
2022 |
192.1 |
0.359 |
2023 |
192.1 |
0.278 |
2024 |
192.0 |
0.189 |
2025 |
191.7 |
0.097 |
2026 |
175.4 |
0.003 |
2027 |
12.8 |
0.091 |
2028 |
12.5 |
0.184 |
2029 |
12.4 |
0.274 |
2030 |
12.4 |
0.358 |
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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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