12018-3439 I   215

 
 
12h 01m 46.09s -34 39' 01.1" P.A. 339.6 sep 0.19 mag 7.27,8.48 Sp G0V dist. 55.96 pc (182.54 l.y.)
 
 
Coord 2000
12018-3439
Discov num
I   215
Comp
Coord arcsec 2000
12 01 46.09 -34 39 01.1
Date first
1897
Date last
2017
Obs
76
Pa first
250
Pa last
348
P.A. Now (θ)
339.6°
Sep first
0.7
Sep last
0.2
Sep. Now (ρ)
0.19"
Mag pri
7.27
Mag sec
8.48
delta mag (ΔM)
1.21
Spectral class
G0V (yellow)
Pri motion ra
-191
Sec motion ra
-191
Pri motion dec
+017
Sec motion dec
+017
Notes
N O V (See Notes, Orbital solution, Proper motion indicates physical)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
348
Precise sep
0.191
Constellation
Hydra
SAO
203046
HIP
58669
Tycho2
7239-00971-1
HD
104471
GL
Gl 454.2A
CD
CD-33 8130
Distance
55.96
Distance ly
182.54
last precise pa
348
last precise sep
0.191
 
 
ORBITAL ELEMENTS
 
 
Period (P)156y Periastron (T)2018.8y± 0.2 Semi-major axis (a)0.781a± 0.004
Eccentricity (e)0.386± 0.011 Inclination (i)112.4°± 0.4 Longitude of periastron (ω)282.7°± 1.1
Node (Ω)270.3°± 0.5 Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation2013
label rho theta
2000 0.620 83.5
2001 0.598 82.2
2002 0.574 80.8
2003 0.549 79.2
2004 0.522 77.5
2005 0.494 75.5
2006 0.465 73.4
2007 0.434 70.9
2008 0.402 68.1
2009 0.370 64.8
2010 0.337 60.8
2011 0.305 56.0
2012 0.273 50.0
2013 0.244 42.6
2014 0.218 33.2
2015 0.198 21.7
2016 0.186 8.1
2017 0.185 353.6
2018 0.193 339.6
2019 0.211 327.4
2020 0.235 317.5
2021 0.264 309.5
2022 0.294 303.1
2023 0.326 297.9
2024 0.358 293.7
2025 0.389 290.1
2026 0.419 287.1
2027 0.447 284.4
2028 0.474 282.1
2029 0.499 280.0
2030 0.523 278.1

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

grafico orbita





wds12018-3439a.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
12018-3439 I 215 2006 68 73 0.5 7.27 8.48 G0V NOD 120146.09-343901.1
12018-3439 I 215 2009 69 64 0.4 7.27 8.48 G0V NOD 120146.09-343901.1
12018-3439 I 215 2010 70 61 0.3 7.27 8.48 G0V NOD 120146.09-343901.1
12018-3439 I 215 2011 71 56 0.3 7.27 8.48 G0V NOD 120146.09-343901.1
12018-3439 I 215 2013 72 41 0.2 7.27 8.48 G0V NOD 120146.09-343901.1
12018-3439 I 215 2015 73 18 0.2 7.27 8.48 G0V NO V 120146.09-343901.1
12018-3439 I 215 2017 76 348 0.2 7.27 8.48 G0V NO V 120146.09-343901.1

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