17420+1557 BU 1251AB

 
 
17H 41M 58.64S +15 57' 07.8" P.A. 96.9 SEP 1.41 MAG 5.59,9.38 SP F3IV DIST. 34.86 PC (113.71 L.Y.)
 
 
Coord 2000
17420+1557
Discov num
BU 1251
Comp
AB
Coord arcsec 2000
17 41 58.64 +15 57 07.8
Date first
1891
Date last
2007
Obs
37
Pa first
79
Pa last
111
P.A. Now (θ)
96.9°
Sep first
1.4
Sep last
1.4
Sep. Now (ρ)
1.41"
Mag pri
5.59
Mag sec
9.38
delta mag (ΔM)
3.79
Spectral class
F3IV (yellow-white)
Pri motion ra
+001
Sec motion ra
-007
Pri motion dec
+114
Sec motion dec
+103
Notes
O (Orbital solution)
This double is physical.
 
 
17420+1557 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 103033 17420+1557 BU 1251 AB 1891 2007 37 97 1.4 5.59 9.38 3.79 Y <===
Show 103033 17420+1557 BU 1251 AC 1910 2001 5 271 154.7 5.59 14.46 8.87
Triple system
3 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation
Hercules
SAO
103033
HIP
86623
Tycho2
1551-02120-1
HD
160910
HR
6594
ADS
10723
BD
BD+16 3256
Distance
34.86
Distance ly
113.71
last precise pa
111.2
last precise sep
1.43
 
 
ORBITAL ELEMENTS
 
 
Period (P)144y Periastron (T)1949.64y Semi-major axis (a)1.04a
Eccentricity (e)0.42 Inclination (i)148.3° Longitude of periastron (ω)150°
Node (Ω)67° Note Grade4(1=Definitive, 9=Indet.)
Equinox Last observation1989
label rho theta
2000 1.244 118.0
2001 1.256 116.7
2002 1.268 115.4
2003 1.280 114.1
2004 1.291 112.9
2005 1.302 111.6
2006 1.313 110.4
2007 1.323 109.2
2008 1.333 108.0
2009 1.343 106.8
2010 1.352 105.7
2011 1.360 104.6
2012 1.368 103.4
2013 1.376 102.3
2014 1.384 101.2
2015 1.391 100.1
2016 1.397 99.1
2017 1.403 98.0
2018 1.409 96.9
2019 1.414 95.9
2020 1.418 94.9
2021 1.423 93.8
2022 1.426 92.8
2023 1.429 91.8
2024 1.432 90.7
2025 1.434 89.7
2026 1.436 88.7
2027 1.437 87.7
2028 1.438 86.7
2029 1.438 85.7
2030 1.437 84.7

Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.

grafico orbita





grafico misure orbit6
Measures: green=micrometric, blue=interferometric, purple=photographic