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Latest Details
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Name
  tet Eri  
AAVSO UID
--  
Constellation
Eridanus Sequence
J2000.0
02 58 15.67 -40 18 16.8  (44.56529 -40.30467) Search nearby
B1950.0 02 56 21.92 -40 30 14.9
Proper motion
RA: -52.89 +/- 0.53 mas/yDec: 21.98 +/- 0.62 mas/ySource: F. Van Leeuwen, 2007
Galactic coord. 247.856 -60.736
Other names

(Internal only)
tet Eri 1 2MASS J02581590-4018167 Acamar
CCDM J02583-4018A CD-40 771 CD-40 771A
CPD-40 253 CPD-40 253A CSV 100250
GSC 07563-01016 Gaia DR3 5044368071870093312 HD 18622
HIP 13847 HR 897 IDS 02545-4042 A
NSV 1002 PPM 307195 SAO 216113
TIC 321087975 TYC 7563-1016-1 WDS J02583-4018A
Zinn 0169 tet 1 Eri  
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Variability type
ELL:
Spectral type A3IV-V
Mag. range
3.24 (0.022) V
Discoverer --
Epoch
11 Nov 2020 (HJD 2459165.2) Ephemeris
Outburst --
Period 4.1077 d
Rise/eclipse dur. --
Remarks
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1 Riesen, Peter Uncertain classification and identification. Triple system. tet 1 Eri is a spectroscopic binary (2001A&A...376..586F) and it has been chosen as the variable star with potential ELL variations in an moderately eccentric orbit. tet 2 Eri (V= 4.35, A1VpMg) is 8.4" away. Combined mean magnitude V= 2.90 with amplitude 0.016. tet 2 Eri might be the actual variable, showing ACV variations. In that case, the corrected amplitude would be 0.06 mag.
2 GCVS Team AB: 3.4, 4.4, 8", 90deg, 1991; [Delta]m var?
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References
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1 Ricker, G. R.; et al., 2014, Transiting Exoplanet Survey Satellite (TESS) 2014SPIE.9143E..20R
2 Gray, R. O.; Corbally, C. J.; Garrison, R. F.; et al., 2006, Contributions
to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0
within 40 pc-The Southern Sample
2006AJ....132..161G
3 Faraggiana, R.; et al., 2001, Spectra of binaries classified as lambda
Bootis stars
2001A&A...376..586F
4 Faraggiana, R.; Gerbaldi, M.; Bonifacio, P., 2001, Spectra of binaries
classified as lambda Bootis stars
2001A&A...376..586F
5 Perryman, M. A. C.; et al., 1997, The HIPPARCOS and TYCHO catalogues 1997HIP...C......0E
6 B.A.Gould, Cord Res 1, 128-342, 1879. --
External Links
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Location    Go   
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Catalog Data
Information from selected catalogs obtained by cross-matching to 2 arc seconds using the CDS X-Match Service. These data may not be complete.
AllWISE W3 = 2.30W4 = 2.54W3 - W4 = -0.24
Images
Please review Digitized Sky Survey Acknowledgment and Copyright.
Size 5' x 5' (297 x 298 pixels)
Center 02 58 15.67 -40 18 16.8 (J2000)
Source STScI
Survey

Red, all sky, 1.0 arcsec/pixel
  Negative
Supporting Documents
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2 Phase Plot - ELL Riesen, Peter 2025-10-24 09:39 UTC Phase Plot from TESS data, sector 31
1 Light curve Riesen, Peter 2025-10-10 08:54 UTC TESS light curve showing ellipsoidal variability
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Revision History
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3 Riesen, Peter 2025-10-10 08:54 UTC Spectral type from 2006AJ....132..161G. Type, period, epoch and amplitude from TESS and Hipparcos data. Mean magnitude derived from Hipparcos and GCPD data. Hipparcos position.
2 Admin, VSX 2010-01-18 23:18 UTC Position updated to NSV version of June 2009.
1 Admin, VSX 2005-12-18 01:33 UTC Initial upload.