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Current system
01377-5714
KRV 54
Alp Eri


Nearby doubles
21' : 01362-5731
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UC 576

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DUN 5

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FAL 2

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TDS1943

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UC 602

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BRT2529

108' : 01339-5531
RST1221

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CVN 35

121' : 01429-5908
JSP 24

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WIS 29

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HLN 2

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HJ 3446

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NSN 209

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HDS 177

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RST 40

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HJ 3434

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HJ 3430AB



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Multiple Systems
Neglected List I
Neglected List II
Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

01377-5714 KRV 54 (Alp Eri)

 
 
01h 37m 42.85s -57° 14' 12.3" P.A. 309.00 sep 0.3 mag 0.70,2.10 Sp B6Ve+A2V dist. 42.75 pc (139.45 l.y.)
 
 
Coord 2000 01377-5714 Discov num KRV  54 Comp Coord arcsec 2000 01 37 42.85 -57 14 12.3
Date first 2006 Date last 2019 Obs 103
Pa first 319 Pa last 309 P.A. Now (θ) 300.3° (calc)
Sep first 0.3 Sep last 0.293 Sep. Now (ρ) 0.293" (calc)
Mag pri 0.70 Mag sec 2.10 delta mag (ΔM) 1.4 Spectral class B6Ve+A2V (blue-white/white)
Pri motion ra +087 Sec motion ra
Pri motion dec -038 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name Alp Eri Constellation Eridanus SAO 232481 HIP 7588
Tycho2 8478-01395-1 HD 10144 HR 472 GC 1979
CP CP-57 334 Bayer Alpha Eridani Bayer name Alp Eri FK5 54
Distance 42.75 Distance ly 139.45 Bayer greek α Eri
 
 
ORBITAL ELEMENTS
 
 
Period (P)7.0389y± 0.0015 Periastron (T)54743.44m (2008.76y)± 0.53 Semi-major axis (a)171.9m± 0.25
Eccentricity (e)0.7258± 0.0015 Inclination (i)30.32°± 0.35 Longitude of periastron (ω)172.05°± 0.87
Node (Ω)310.91°± 0.8 Notesn ReferenceKrv2022
Equinox2000 Last observation2019 Grade2(1=Definitive, 9=Indet.)
label theta rho
2000 325.3 0.237
2001 351.6 0.135
2002 209.6 0.069
2003 273.4 0.193
2004 290.3 0.265
2005 301.6 0.294
2006 312.0 0.287
2007 324.6 0.240
2008 349.8 0.141
2009 201.7 0.064
2010 272.4 0.189
2011 289.8 0.263
2012 301.2 0.294
2013 311.5 0.288
2014 324.0 0.243
2015 348.1 0.146
2016 192.5 0.060
2017 271.4 0.186
2018 289.3 0.261
2019 300.8 0.293
2020 311.1 0.289
2021 323.5 0.245
2022 346.5 0.151
2023 182.0 0.056
2024 270.4 0.182
2025 288.8 0.259
2026 300.3 0.293
2027 310.7 0.290
2028 322.9 0.248
2029 345.0 0.156
2030 170.0 0.052
2031 269.3 0.178
2032 288.3 0.257
2033 299.9 0.292
2034 310.3 0.291
2035 322.3 0.250
2036 343.6 0.161
2037 156.7 0.050
2038 268.2 0.173
2039 287.7 0.254
2040 299.5 0.292
2041 309.9 0.291
2042 321.8 0.253
2043 342.3 0.165
2044 142.1 0.048
2045 267.0 0.169
2046 287.2 0.252
2047 299.1 0.291
2048 309.5 0.292
2049 321.2 0.255
2050 341.0 0.170


 
 grafico orbita
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
wds01377-5714a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic