01541-7729 JSP  31

 
 
01h 54m 06.06s -77 29' 28.5" P.A. 51 sep 0.32 mag 7.55,8.25 Sp A8IV/V dist. 147.93 pc (482.55 l.y.)
 
 
Coord 2000
01541-7729
Discov num
JSP  31
Comp
Coord arcsec 2000
01 54 06.06 -77 29 28.5
Date first
1929
Date last
2016
Obs
8
Pa first
354
Pa last
52
P.A. Now (θ)
51°
Sep first
0.2
Sep last
0.3
Sep. Now (ρ)
0.32"
Mag pri
7.55
Mag sec
8.25
delta mag (ΔM)
0.7
Spectral class
A8IV/V (white)
Pri motion ra
+012
Sec motion ra
Pri motion dec
+039
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
52.2
Precise sep
0.311
Constellation
Hydrus
SAO
255831
HIP
8866
Tycho2
9352-01737-1
HD
12121
CP
CP-78 40
Distance
147.93
Distance ly
482.55
last precise pa
52.2
last precise sep
0.311
 
 
ORBITAL ELEMENTS
 
 
Period (P)250y Periastron (T)1968.23y Semi-major axis (a)0.43a
Eccentricity (e)0.5 Inclination (i)112.1° Longitude of periastron (ω)180.1°
Node (Ω)25.5° Note Grade5(1=Definitive, 9=Indet.)
Equinox2000 Last observation2016
label rho theta
2000 0.162 81.3
2001 0.170 78.1
2002 0.178 75.3
2003 0.187 72.7
2004 0.195 70.3
2005 0.204 68.1
2006 0.213 66.1
2007 0.222 64.3
2008 0.231 62.6
2009 0.240 61.1
2010 0.250 59.6
2011 0.259 58.3
2012 0.268 57.0
2013 0.277 55.8
2014 0.286 54.7
2015 0.294 53.7
2016 0.303 52.7
2017 0.312 51.8
2018 0.321 51.0
2019 0.329 50.1
2020 0.338 49.4
2021 0.346 48.6
2022 0.354 47.9
2023 0.362 47.2
2024 0.371 46.6
2025 0.378 46.0
2026 0.386 45.4
2027 0.394 44.8
2028 0.402 44.3
2029 0.409 43.7
2030 0.417 43.2

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

grafico orbita





wds01541-7729e.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
01541-7729 JSP 31 1991 7 122 0.1 7.55 8.25 A8IV/V N 015406.06-772928.5
01541-7729 JSP 31 2016 8 52 0.3 7.55 8.25 A8IV/V NO 015406.06-772928.5

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