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Alert Notice 413: Nova in Eridanus (KT Eri = N Eri 2009)

December 9, 2009
Event: Nova in Eridanus (KT Eri = Nova Eri 2009)

Discovered By: K. Itagaki, Yamagata, Japan, via H. Yamaoka, Kyushu University, Japan

Discovery Date: Nov. 25.536 UT, using his 0.21-m patrol system

Discovery Magnitude: unfiltered CCD magnitude 8.1

Position: R.A = 04:47:54.21, Decl. = -10:10:43.1 (equinox 2000.0)
from Itagaki's confirming image on Nov. 25.545 UT

Spectra: KT Eri appears to be a He/N nova, according to spectroscopy from 
several sources, including on Nov. 26.5-26.6 UT by H. Maehara, Kwasan 
Observatory, Kyoto University, M. Fujii, Okayama, A. Arai and M. Isogai, Kyoto 
Sangyo University, and K. Imamura, Okayama University of Science; and on Nov. 
26.4 UT by R. J. Rudy, T. R. Prater, and R. W. Russell, The Aerospace 
Corporation, R. C. Puetter, University of California at San Diego, and R. B. 
Perry, NASA. According to Nesci et al. (ATEL 2338), a historical spectrum of 
the progenitor (see Note b) from the Digitized First Byurakan Survey (FBS) 
shows the signature of a hot star with some circumstellar material.

Observations Reported to the AAVSO: Over 2200 observations of KT Eri have been 
reported to the AAVSO since the nova's discovery. All observations may be seen 
on the AAVSO website quick-look page or downloaded from the data request page.
Representative observations include:
NOV 26.1736, 8.075 V (+/-0.005), G. Meyers, Hillsborough, CA;
NOV 26.9271, 8.2 A. Wargin, Bydgoszcz, Poland;
NOV 27.2292, 8.2, C. Hergenrother, Tucson, AZ;
NOV 27.4271, 8.3, P. Camilleri, Sydney, NSW, Australia;
NOV 27.9306, 7.9, K. Wenzl, Grossostheim, Germany;
NOV 28.1944, 8.4, T. Bartlett, Canadian, TX; 
NOV 28.4886, 8.29 V (+/-0.034), G. Di Scala, Sydney, NSW, Australia;
NOV 28.8510, 8.2, W. Vollmann, Vienna, Austria;
NOV 29.0972, 8.3, L. Shotter, Uniontown, PA;
NOV 29.1420, 8.467 B (+/-0.001), A. Shoup, Elida, OH;
NOV 29.1425, 8.563 V (+/-0.001), Shoup;
NOV 29.5396, 8.59 V (+/-0.20), Di Scala;
NOV 29.9222, 8.5, S. Swierczynski, Dobczyce, Poland;
NOV 30.3493, 8.3, R. Stine, Newbury Park, CA;
NOV 30.3622, 8.571 V (+/-0.001), J. Foster, Los Angeles, CA;
NOV 30.9970, 8.5, B. Granslo, Fjellhamar, Norway;
DEC 01.1482, 8.678 V (+/-0.006), R. Tomlin, Big Rock, IL;
DEC 01.1492, 8.532 B (+/-0.007), Tomlin;
DEC 01.1694, 8.6, J. Bortle, Stormville, NY;
DEC 01.3623, 8.568 V (+/-0.001), Foster;
DEC 01.9611, 8.5, A. Amorim, Florianopolis, Brazil;
DEC 02.1264, 8.78 V (+/-0.028), E. Muyllaert, Oostende, Belgium;
DEC 02.1417, 8.6, R. Tyson, Freeport, NY;
DEC 02.4436, 8.744 B (+/-0.015), T. Bohlsen, Armidale, NSW, Australia;
DEC 02.4441, 8.842 V (+/-0.007), Bohlsen;
DEC 02.4462, 8.209 R (+/-0.005), Bohlsen;
DEC 02.4466, 8.320 I (+/-0.009), Bohlsen;
DEC 02.8820, 8.7, Vollmann;
DEC 03.4903, 8.39 B (+/-0.020), Di Scala;
DEC 03.4903, 8.65 V (+/-0.020), Di Scala;
DEC 03.4903, 8.06 R (+/-0.020), Di Scala;
DEC 03.4903, 8.16 I (+/-0.020), Di Scala;
DEC 04.0310, 8.7, G. Poyner, Birmingham, England;
DEC 04.6520, 8.68 B (+/-0.004), S. O'Connor, St. Georges, Bermuda;
DEC 04.6540, 8.72 V (+/-0.003), O'Connor;
DEC 05.2915, 8.939 V (+/-0.001), S. Padovan, Foixa, Spain;
DEC 05.4842, 8.88 B (+/-0.003), P. Nelson, Ellinbank, Victoria, Australia;
DEC 05.4855, 8.79 V (+/-0.017), Nelson;
DEC 05.5243, 8.7, W. Xu, Guangzhou, China;
DEC 06.0764, 8.36, G. Beltran, Cochabamba, Bolivia;
DEC 06.3356, 8.853 V (+/-0.005), Tomlin;
DEC 06.3374, 8.610 B (+/-0.004), Tomlin;
DEC 06.8681, 8.7, P. Wils, Hever, Belgium;
DEC 07.9021, 8.9, Swierczynski;
DEC 08.2868, 8.9, C. Spratt, Victoria, BC, Canada;
DEC 08.4917, 8.9, H. Matsuyama, Kanimbla, Queensland, Australia;
DEC 09.0660, 8.80 V, Poyner;

Charts: Finder charts for KT Eri may be plotted by entering the
coordinates above into VSP: http://www.aavso.org/observing/charts/vsp/

Reporting Observations: Please report all observations to the AAVSO as
KT ERI. N Eri 2009, VSX J044754.2-101043, or its AUID 000-BJR-847 may 
also be used, but KT ERI is preferred.

Notes:
a. Visual and CCD observers are urged to follow KT Eri as it fades. Arne 
Henden, AAVSO, recommends time-series photometry. Since pre-discovery images 
indicate that KT Eri actually reached 5th magnitude, and since the apparent 
progenitor is relatively bright at 15th magnitude, observers are encouraged 
to check their own data archives and public data archives for pre-outburst 
photometry. 

b. H. Yamaoka reports that the blue progenitor star noted by Itagaki on his 
archival patrol images has USNO-B1.0 position end figures 54.19s, 42.9".  
E. Guido and G. Sostero provide position end figures 54.12s, 43.1" and CCD 
magnitude ~8.2 on images taken Nov. 26.36 UT remotely using a 0.25-m 
reflector near Mayhill, NM, USA.

c. E. V. Kazarovets reports that the GCVS team has assigned Nova Eri 2009 the
name KT Eri.

d. Initially announced in CBET 2050 (Daniel W. E. Green, ed.) and AAVSO
Special Notice #181 (Elizabeth O. Waagen), with additional information
in Special Notices #182 (Arne A. Henden) and #183 (Henden) and CBETs 2053 and 
2055 (Daniel W. E. Green, ed.). Except for observations reported directly to
the AAVSO, the information in this Alert Notice is taken from the IAU 
CBETs and IAU Circular 9098 (Daniel W. E. Green, ed.).

Congratulations to K. Itagaki on his latest discovery!

Good observing,

Elizabeth O. Waagen
Senior Technical Assistant

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