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Doubles in session


Current system
03178-1407
HU 432
HD 20530


Nearby doubles
6' : 03176-1412
GWP 446AB

43' : 03149-1400
HJ 3558

47' : 03148-1427
HJ 3557

52' : 03212-1359
HJ 3567

59' : 03203-1322
RST3378

61' : 03139-1429
GAL 86

62' : 03202-1457
LDS3479

65' : 03133-1410
TDS2485

79' : 03232-1404
GWP 459AB

81' : 03221-1316
HJ 3569

84' : 03235-1413
RST3381

84' : 03136-1504
LDS3466AB

98' : 03244-1400
BU 12

99' : 03237-1321
KPP1854

100' : 03112-1338
TDS2469

104' : 03190-1549
GWP 448

104' : 03175-1222
J 1456

104' : 03174-1223
UC 975

105' : 03137-1241
KPP2022

112' : 03102-1352
HU 605

123' : 03153-1209
TDS2503

127' : 03118-1537
LDS3464

134' : 03258-1304
HU 21

134' : 03244-1539
A 2909AB

135' : 03248-1533
GWP 466

135' : 03087-1432
GWP 426



Selections
Full WDS
Binocular doubles
Binary Systems
Triple Systems
Quadruple Systems
Multiple Systems
Neglected List I
Neglected List II
Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

03178-1407 HU 432 (HD 20530)

 
 
03h 17m 45.24s -14° 06' 46.6" P.A. 101.00 sep 0.2 mag 10.40,10.40 Sp K0V
 
 
Coord 2000 03178-1407 Discov num HU  432 Comp Coord arcsec 2000 03 17 45.24 -14 06 46.6
Date first 1901 Date last 2020 Obs 8
Pa first 46 Pa last 100.9 P.A. Now (θ) 100.9°
Sep first 0.2 Sep last 0.184 Sep. Now (ρ) 0.184"
Mag pri 10.40 Mag sec 10.40 delta mag (ΔM) 0 Spectral class K0V (yellow-orange)
Pri motion ra +064 Sec motion ra
Pri motion dec +027 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 20530 Constellation Eridanus SAO 148887 Tycho2 5301-01012-1
Gaia DR2 5155370883158999808 HD 20530 ADS 2456
 
 
ORBITAL ELEMENTS
 
 
Period (P)73.67y Periastron (T)1979.23y Semi-major axis (a)0.2017a
Eccentricity (e)0.152 Inclination (i)40.4° Longitude of periastron (ω)223.2°
Node (Ω)45.4° Notes ReferenceTok2020e
Equinox Last observation2019 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 30.6 0.207
2001 34.1 0.211
2002 37.4 0.215
2003 40.5 0.218
2004 43.7 0.220
2005 46.7 0.222
2006 49.7 0.224
2007 52.7 0.224
2008 55.7 0.224
2009 58.6 0.224
2010 61.6 0.223
2011 64.7 0.222
2012 67.7 0.220
2013 70.9 0.217
2014 74.1 0.215
2015 77.4 0.212
2016 80.7 0.208
2017 84.2 0.205
2018 87.9 0.201
2019 91.6 0.197
2020 95.6 0.193
2021 99.6 0.190
2022 103.9 0.186
2023 108.3 0.182
2024 112.9 0.179
2025 117.7 0.175
2026 122.7 0.173
2027 127.8 0.170
2028 133.0 0.168
2029 138.3 0.167
2030 143.7 0.166
2031 149.2 0.165
2032 154.7 0.166
2033 160.1 0.166
2034 165.5 0.167
2035 170.8 0.168
2036 176.1 0.170
2037 181.2 0.172
2038 186.2 0.174
2039 191.1 0.175
2040 195.9 0.177
2041 200.7 0.178
2042 205.3 0.179
2043 210.0 0.180
2044 214.6 0.180
2045 219.3 0.179
2046 223.9 0.178
2047 228.7 0.176
2048 233.6 0.173
2049 238.7 0.170
2050 244.0 0.166


 
 grafico orbita
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
wds03178-1407b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic