RA/DEC (2000)
14:57:47.435 +00:21:46.71
224.447647143 +0.362975714286
Type
Varstar
Redshift
Discovery ReportClassification Report
Reporting Group
ATLAS
Discovering Data Source
ATLAS
Discovery Date
2018-04-26 11:39:50.000
TNS AT
Y
Public
Y
Discovery Mag
17.329
Filter
orange-ATLAS
Reporter/s
J. Tonry, B. Stalder, L. Denneau, A. Heinze, H. Weiland (IfA, University of Hawaii), A. Rest (STScI), K. W. Smith, S. J. Smartt, D. R. Young, M. Fulton, O. McBrien, D. O'Neill, P. Clark (Queen's University Belfast)
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌AT_2018bby - 2021-08-07 06:22:38 FTN / FLOYDS-N (Global SN Project)z=
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   Binning factor: (rounded to nearest integer >1)
Mouse hovers at WL: 0 (rest),

Light curves

 ▌ATLAS-HKO_ATLAS-02_orange
   
Pointer position (MJD, Mag, Abs.Mag): (0.00, 0.00, 0.00)
Spectra
 ID Obs-date (UT) Tel / Inst Exp-Time Observer/s Reducer/s Group Spectrum ascii file Spectrum fits file Spec. Type Assoc. Groups End prop. period Remarks
10398 2021-08-07 06:22:38 FTN / FLOYDS-N 1800 Las Cumbres Observatory Megan Newsome Global SN Project tns_2018bby_2021-08-07_06-22-38_FTN_FLOYDS-N_Global_SN_Project.ascii Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
orange-ATLAS ATLAS-HKO_ATLAS-02 2018-04-22 13:06:14 - 2018-04-26 11:39:50 2458231.0459954 - 2458234.9859954 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
27466 2018-04-26 11:39:50 2458234.9859954 17.329 0.103 18.26 ABMag orange-ATLAS ATLAS-HKO_ATLAS-02 30 Robot
27465 2018-04-22 13:06:14 2458231.0459954 17.5 ABMag orange-ATLAS ATLAS-HKO_ATLAS-02 30 Robot [Last non detection]
AT Reports
ID Time received (UT) Sender Reporter/s Reporting group Disc. Data Source RA DEC Discovery date (UT) Discovery Mag. Filter Related files AT Type Host name Internal name Assoc. Groups End prop. period Remarks ADS Bibcode Unreal Auto classification
18057 2018-04-26 20:25:02 ATLAS_Bot1 J. Tonry, B. Stalder, L. Denneau et al. ATLAS ATLAS 14:57:47.435 +00:21:46.71 2018-04-26 11:39:50.000 17.329 orange-ATLAS PSN ATLAS18nuj ATLAS 2018TNSTR.551....1T N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
10382 2021-08-09 17:44:14 Megan Newsome Megan Newsome (UCSB/Las Cumbres), Iair Arcavi (TAU), Marco C Lam (TAU), Yael Dgany (TAU), Jamison Burke (LCO/UCSB), Daichi Hiramatsu (LCO/UCSB), D. Andrew Howell (LCO/UCSB), Curtis McCully (LCO/UCSB), Estefania Padilla Gonzalez (LCO/UCSB), Craig Pellegrino (LCO/UCSB) Global SN Project Varstar 1 Global SN Project We report a candidate dwarf nova/polar/intermediate nova system (under the transient designations: AT2018bby, ZTF20aammhxq, and ATLAS18nuj) that had outbursts in three occasions with an amplitude of ~6mag. Low-state durations are ~600days. It was reported as a candidate hot white dwarf in Bianchi et al. (2011) with Galex FUV=22.56 and NUV=22.95, and SDSS u=22.53, g=22.98, r=22.88, i=21.85, and z=22.83. The first outburst was reported as a supernova candidate ATLAS18nuj, reaching a maximum brightness of o=17.33 at UT 2018-04-26 11:39:50. The second and third outbursts were observed by ZTF reaching r=16.955 at UT 2020-02-09 12:08:54 and r=17.391 at UT 2021-08-04 05:29:02 at maximum. The spectrum shows weak H-alpha and some He emission lines. From H-beta to H-zeta, there are either emission lines on top of the absorption profiles, or Zeeman splitting features, suggesting a polar or intermediate polar system. 2021TNSCR2741....1N
Spectra
ID Obs-date (UT) Tel / Inst Exp-Time Observer/s Reducer/s Group Spectrum ascii file Spectrum fits file Spec. Type Assoc. Groups End prop. period Remarks
10398 2021-08-07 06:22:38 FTN / FLOYDS-N 1800 Las Cumbres Observatory Megan Newsome Global SN Project tns_2018bby_2021-08-07_06-22-38_FTN_FLOYDS-N_Global_SN_Project.ascii Object

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