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Doubles in session


Current system
23270-1515
HU 297
HD 220811


Nearby doubles
12' : 23267-1505
RAO 680

12' : 23261-1514
GWP3297

50' : 23246-1551
GWP3292

62' : 23227-1516
RST4126

62' : 23249-1421
KPP4316

63' : 23243-1425
KPP1380

64' : 23227-1502
HU 295AB

66' : 23237-1430
HJ 5397

75' : 23318-1448
HDS3351

81' : 23219-1442
RST4124

85' : 23326-1454
SKF 127

86' : 23211-1512
RST4123

87' : 23321-1431
BRT 602

95' : 23232-1632
HU 296

97' : 23292-1646
GWP3307AB

102' : 23257-1655
HJ 3192

103' : 23226-1353
RST4125

104' : 23340-1502
RST4128

106' : 23342-1531
SKF 128

107' : 23343-1509
UC 4988

114' : 23219-1642
HU 293

116' : 23220-1345
GWP3284

120' : 23206-1359
NSN 785

124' : 23353-1448
RST4129

124' : 23351-1551
GWP3325

125' : 23254-1717
HJ 5398



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.

23270-1515 HU 297 (HD 220811)

 
 
23h 26m 57.04s -15° 14' 51.7" P.A. 301.00 sep 0.5 mag 7.24,8.52 Sp A4V dist. 116.69 pc (380.64 l.y.)
 
 
Coord 2000 23270-1515 Discov num HU  297 Comp Coord arcsec 2000 23 26 57.04 -15 14 51.7
Date first 1900 Date last 2021 Obs 19
Pa first 312 Pa last 301.4 P.A. Now (θ) 303.5°
Sep first 0.4 Sep last 0.467 Sep. Now (ρ) 0.527"
Mag pri 7.24 Mag sec 8.52 delta mag (ΔM) 1.28 Spectral class A4V (white)
Pri motion ra +023 Sec motion ra
Pri motion dec -007 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 220811 Constellation Aquarius SAO 165698 HIP 115742
Tycho2 6396-00587-1 Gaia DR2 2407648994148333824 HD 220811 GC 32619
ADS 16758 BD BD-16 6291 Distance 116.69 Distance ly 380.64
 
 
ORBITAL ELEMENTS
 
 
Period (P)92.6y± 2.9 Periastron (T)1983.5y± 1.8 Semi-major axis (a)0.374a± 0.067
Eccentricity (e)0.9 Inclination (i)111.5°± 7.8 Longitude of periastron (ω)48.6°± 11.3
Node (Ω)142.5°± 3.2 Notes ReferenceTok2019c
Equinox Last observation2018 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 310.1 0.439
2001 309.6 0.449
2002 309.2 0.458
2003 308.8 0.466
2004 308.4 0.474
2005 308.0 0.481
2006 307.7 0.488
2007 307.3 0.494
2008 307.0 0.499
2009 306.6 0.504
2010 306.3 0.508
2011 305.9 0.512
2012 305.6 0.515
2013 305.3 0.518
2014 305.0 0.521
2015 304.6 0.523
2016 304.3 0.524
2017 304.0 0.526
2018 303.7 0.526
2019 303.4 0.527
2020 303.1 0.527
2021 302.8 0.527
2022 302.4 0.526
2023 302.1 0.525
2024 301.8 0.524
2025 301.5 0.522
2026 301.2 0.520
2027 300.8 0.517
2028 300.5 0.515
2029 300.2 0.512
2030 299.9 0.508
2031 299.5 0.504
2032 299.2 0.500
2033 298.8 0.496
2034 298.5 0.491
2035 298.1 0.486
2036 297.7 0.481
2037 297.4 0.476
2038 297.0 0.470
2039 296.6 0.463
2040 296.2 0.457
2041 295.7 0.450
2042 295.3 0.443
2043 294.8 0.435
2044 294.4 0.427
2045 293.9 0.419
2046 293.4 0.411
2047 292.9 0.402
2048 292.3 0.393
2049 291.7 0.383
2050 291.1 0.374


 
 grafico orbita
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
wds23270-1515a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic