16254+3724 CHR  55 (25 Her)

 
 
16h 25m 24.17s +37 23' 38.7" P.A. 34.6 sep 0.11 mag 5.60,8.30 Sp A5V+G0 dist. 74.46 pc (242.89 l.y.)
 
 
Coord 2000
16254+3724
Discov num
CHR  55
Comp
Coord arcsec 2000
16 25 24.17 +37 23 38.7
Date first
1985
Date last
2007
Obs
16
Pa first
355
Pa last
133
P.A. Now (θ)
34.6°
Sep first
0.2
Sep last
0.1
Sep. Now (ρ)
0.11"
Mag pri
5.60
Mag sec
8.30
delta mag (ΔM)
2.7
Spectral class
A5V+G0 (white/yellow)
Pri motion ra
+006
Sec motion ra
Pri motion dec
-012
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
132.9
Precise sep
0.077
Name
25 Her
Constellation
Hercules
SAO
65290
HIP
80460
Tycho2
2587-00070-1
HD
148283
HR
6123
GC
22108
BD
BD+37 2750
Flamsteed
25 Herculis
Flamsteed name
25 Her
Distance
74.46
Distance ly
242.89
last precise pa
132.9
last precise sep
0.077
 
 
ORBITAL ELEMENTS
 
 
Period (P)76.32y± 50 Periastron (T)1989.98y± 0.05 Semi-major axis (a)0.357a± 0.013
Eccentricity (e)0.691± 0.008 Inclination (i)96.6°± 0.5 Longitude of periastron (ω)292.5°± 1.5
Node (Ω)177.5°± 0.5 Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation2007
label rho theta
2000 0.155 164.3
2001 0.145 162.1
2002 0.135 159.6
2003 0.124 156.6
2004 0.112 153.0
2005 0.101 148.6
2006 0.090 143.1
2007 0.080 136.3
2008 0.071 127.5
2009 0.064 116.6
2010 0.060 103.6
2011 0.059 89.5
2012 0.062 75.6
2013 0.067 63.5
2014 0.075 53.5
2015 0.085 45.7
2016 0.095 39.5
2017 0.107 34.6
2018 0.119 30.6
2019 0.131 27.4
2020 0.143 24.8
2021 0.155 22.5
2022 0.168 20.6
2023 0.180 18.9
2024 0.192 17.5
2025 0.204 16.2
2026 0.216 15.1
2027 0.227 14.1
2028 0.238 13.1
2029 0.249 12.3
2030 0.260 11.5

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

grafico orbita





wds16254%2B3724c.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
16254+3724 CHR 55 2005 14 145 0.1 5.50   A5V NO 162524.17+372338.7
16254+3724 CHR 55 2007 15 133 0.1 5.60 8.30 A5V G0 NOD 162524.17+372338.7

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