01388-1758 LDS 838

 
 
01H 39M 01.54S -17 57' 01.8" P.A. 4.1 SEP 2.27 MAG 12.70,13.20 SP M5.5V+M6V
 
 
Coord 2000
01388-1758
Discov num
LDS 838
Comp
Coord arcsec 2000
01 39 01.54 -17 57 01.8
Date first
1935
Date last
2011
Obs
102
Pa first
118
Pa last
33
P.A. Now (θ)
4.1°
Sep first
2.0
Sep last
2.1
Sep. Now (ρ)
2.27"
Mag pri
12.70
Mag sec
13.20
delta mag (ΔM)
0.5
Spectral class
M5.5V+M6V (red/red)
Pri motion ra
+339
Sec motion ra
+330
Pri motion dec
+056
Sec motion dec
+056
Notes
N O P (See Notes, Orbital solution, 100-year proper motion)
rPM=0.026 (< 0.3, Physical double)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation
Cetus
last precise pa
33.4
last precise sep
2.134
 
 
ORBITAL ELEMENTS
 
 
Period (P)26.284y± 0.038 Periastron (T)1972.115y± 0.047 Semi-major axis (a)2.0584a± 0.0097
Eccentricity (e)0.6185± 0.002 Inclination (i)127.82°± 0.28 Longitude of periastron (ω)283.27°± 0.21
Node (Ω)145.79°± 0.32 Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation2011
label rho theta
2000 1.205 140.3
2001 1.444 124.5
2002 1.581 112.4
2003 1.668 101.8
2004 1.731 92.1
2005 1.783 83.1
2006 1.833 74.5
2007 1.884 66.4
2008 1.936 58.7
2009 1.991 51.5
2010 2.047 44.6
2011 2.102 38.1
2012 2.154 32.0
2013 2.201 26.1
2014 2.239 20.4
2015 2.267 14.9
2016 2.279 9.5
2017 2.270 4.1
2018 2.236 358.6
2019 2.169 352.8
2020 2.056 346.6
2021 1.880 339.4
2022 1.616 330.3
2023 1.219 316.4
2024 0.667 282.5
2025 0.624 185.7
2026 1.105 146.2
2027 1.390 128.5
2028 1.549 115.6
2029 1.646 104.7
2030 1.714 94.8

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