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Alert Notice 421: Nova in Scorpius (V1311 Sco = N Sco 2010 No. 2)

May 5, 2010
Event: Nova in Scorpius (V1311 Sco = Nova Sco 2010 No. 2)
Discovered Idependently By:
- Koichi Nishiyama, Kurume, Japan, and Fujio Kabashima, Miyaki, Japan
- Hideo Nishimura, Miyawaki, Kakegawa, Shizuoka-ken, Japan (reported via S. Nakano, Sumoto, Japan, in CBET 2262)
- Tadashi Kojima, Tsumagoi, Agatsuma-gun, Gunma-ken, Japan (reported via S. Nakano, Sumoto, Japan, in CBET 2262)
- Yukio Sakurai, Mito, Ibaraki-ken, Japan (reported via S. Nakano, Sumoto, Japan, in CBET 2265)
Discovery Date:
- Nishiyama and Kabashima, Apr. 25.788 UT using a 105-mm f/4 camera lens (+ SBIG STL6303E camera)
- Nishimura, Apr. 25.763 UT
- Kojima, Apr. 25.738 UT
- Sakurai, Apr. 25.734 UT
Discovery Magnitude:
- Nishiyama and Kabashima, unfiltered CCD magnitude 8.6
- Nishimura, unfiltered CCD magnitude 8.3
- Kojima, unfiltered CCD magnitude 8.8
- Sakurai, unfiltered CCD magnitude 8.8
Position: R.A = 16:55:13.16, Decl. = -38:03:46.9 (equinox 2000.0)
from confirming unfiltered CCD frames taken by Nishiyama and Kabashima around Apr. 25.796
- Nishimura, position end figures 12.96s, 48.1"
- Kojima, position end figures 13.46s, 44.7" +/- 5"
- Sakurai, position end figures 13.07s, 45.3", measured by Nakano
Spectra: Low-resolution spectra taken by H. Koberger, Vilaflor, Tenerife, and W. Vollmann, Vienna, Austria, on Apr. 27.199, and by H. Maehara, Kwasan Observatory, Kyoto University, Japan, on Apr. 29.704 UT, confirm a classical nova. Maehara's spectrum has been posted at the following website URL: A low-resolution spectrum by K. Kinugasa, H. Takahashi, and O. Hashimoto, Gunma Astronomical Observatory, China, suggests a He/N nova in decline; it is posted at
Observations Reported to the AAVSO:
APR 26.307, 8.55 V, S. Kiyota, Tsukuba, Japan (via IAU Circular 9142);
26.308, 7.75 Rc, Kiyota;
26.309, 6.92 Ic, Kiyota;
26.310, 10.18 B, Kiyota;
26.4, 8.2, E. Guido and G. Sostero, Mayhill, NM site (via IAU Circular 9142);
26.4514 UT, 9.3, R. Kaufman, Bright, Victoria, Australia;
27.1236, 9.6, G. Beltran, Cochabamba, Bolivia;
27.1237, 9.9, R. Salvo, Montevideo, Uruguay;
27.1549, 11.0, A. Amorim, Florianopolis, Brazil;
27.21, 10.3, H. Koberger and W. Vollmann, Tenerife (via IAU Circular 9142);
27.3918, 10.09 V, S. Dvorak, Clermont, FL;
27.4556, 10.2, A. Salvador, Hermosillo, Mexico;
27.6000, 10.2, M. Linnolt, Ocean View, HI;
27.692, 9.8, Y. Maeda, Nagasaki, Japan (via Maehara in CBET 2265);
28.0938, 10.4, Beltran;
28.3778, 10.9, L. Shotter, Uniontown, PA;
28.4451, 10.5, Salvador;
28.5137, 11.666 B +/-0.016, T. Bohlsen, Armidale, NSW, Australia;
28.5146, 10.610 V +/-0.006, Bohlsen;
28.5190, 9.065 R +/-0.007, Bohlsen;
28.5201, 8.355 I +/-0.008, Bohlsen;
29.5092, 11.966 B +/-0.018, Bohlsen;
29.5108, 10.96 V +/-0.007, Bohlsen;
29.5135, 9.273 R +/-0.007, Bohlsen;
29.5141, 8.667 I +/-0.008, Bohlsen;
29.680, 8.77 Ic, H. Maehara, Kwasan Observatory, Kyoto University (via CBET 2265);
29.681, 9.45 Rc, Maehara;
29.683, 11.21 V, Maehara;
29.685, 12.03 B, Maehara;
MAY 02.0104, 11.9, Amorim;
04.4243, 12.9, Linnolt;
04.5076, <11.8, H. Matsuyama, Kanimbla, Queensland, Australia;
Charts: Finder charts for V1311 Sco may be plotted by entering the coordinates above into VSP:
Reporting Observations: Please report all observations to the AAVSO as V1311 SCO. N Sco 2010 No. 2, AUID 000-BJV-296, or VSX J165513.1-380346 may also be used, but V1311 SCO is preferred.
a. Nothing was visible on Nishiyama and Kabashima's survey frames taken on Apr. 23.786 down to magnitude 12.9 and on Apr. 24.757 down to magnitude 13.2, or on a Digitized Sky Survey plate from 1995 June 4 down to red magnitude 18.0. Nothing was visible down to magnitude 10.2 on a frame taken by Sakurai on Apr. 24.74.
b. E. Guido and G. Sostero report position end figures 13.17s, 47.8" on CCD images obtained Apr. 26.4 UT remotely with a 0.25-m reflector from GRAS Observatory near Mayhill, NM.
c. E. V. Kazarovets, Russian Academy of Sciences, reports that the GCVS team has assigned Nova Sco 2010 No. 2 the name V1311 Sco.
d. Initially announced in CBET 2262 (Green, ed.) and AAVSO Special Notice No. 207 (Elizabeth O. Waagen), with additional information in CBET 2265 (Green) and IAU Circular 9142 (Green). Except for the observations reported to the AAVSO, the information in this Alert Notice is taken from the IAU CBETs and Circular.
Congratulations to Koichi Nishiyama and Fujio Kabashima on their latest discovery, and to Hideo Nishimura, Tadashi Kojima, and Yukio Sakurai on their independent discoveries!
Good observing,
Elizabeth O. Waagen
Senior Technical Assistant

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