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AAVSO Alert Notice 421: Nova in Scorpius (V1311 Sco = N Sco 2010 No. 2) AAVSO HOME > publications > alert notice

AAVSO 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 Circular 


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 Circular 


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, 


b. E. V. Kazarovets, Russian Academy of Sciences, reports that 

the GCVS team has assigned Nova Sco 2010 No. 2 the name V1311 Sco.

c. 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).

ed.). 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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