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Nova in Sagittarius = ASASSN-16ma = PNV J18205200-2822100

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發表於 2016-10-29 07:37:10 | 顯示全部樓層 |閱讀模式
AAVSO Alert Notice 561

October 28, 2016

Nova in Sagittarius = ASASSN-16ma = PNV J18205200-2822100


Event: Nova in Sagittarius

Discovered by:
- ASAS-SN (K. Z. Stanek (Ohio State University) et al.; ATel #9669)
- Yukio Sakurai (Mito, Japan; via TOCP page)

Discovery magnitude:
- ASAS-SN: V~13.7, using quadruple 14-cm "Cassius" telescope at CTIO
- Sakurai: 10.4 unfiltered CCD, using Nikon D7100 digital camera +
180-mm f/2.8 lens

Discovery date:
- ASAS-SN: 2016 October 25.02 UT
- Sakurai: 2016 October 26.380 UT
  
Coordinates (2000.0): R.A. 18 20 52.25  Dec. -28 22 12.1  (from VSX)

Spectra: Spectroscopy indicating that ASASSN-16ma is a classical
nova in the optically thick (Fe-curtain) stage was obtained 2016
Oct. 27.5 UT by P. Luckas (International Centre for Radio Astronomy
Research, Univ. of Western Australia; ARAS Group; ATel #9678).

Observing recommendations: Observations of all types (visual, CCD,
DSLR, spectroscopy) and all bands as instrumentation permits are
strongly encouraged as the nova evolves.

Observations reported to the AAVSO:
2016 Oct. 20.04 UT, <17.3 V (ASAS-SN; Stanek et al., ATel #9669);
23.398, <11.0 unfiltered CCD (Y. Sakurai, Mito, Japan; via TOCP page);
25.02, 13.7: V +/-0.02 (ASAS-SN; Stanek et al., ATel #9669);
26.02, 11.6: V +/-0.01 (ASAS-SN; Stanek et al., ATel #9669);
26.05670, 11.76 B +/-0.07 (S. O'Connor, St. George, Bermuda);
26.05750, 11.44 V +/-0.03 (O'Connor);
26.05900, 11.44 CV +/-0.12 (O'Connor);
26.48750, 11.0 (A. Pearce, Nedlands, W. Australia);
27.0474, 11.04 B (S. Kiyota, Kamagaya, Japan; red color noted; with
0.50-m f/4.5 CDK astrograph + FLI-PL11002M at Mayhill, NM, USA
remotely; via TOCP page);
27.0474, 10.65 V (Kiyota, as above; red color noted);
27.0474, 10.18 Ic (Kiyota, as above; red color noted);
27.48890, 10.6 (Pearce);
27.50153, 10.4 (D. Benn, Klemzig, S. Australia);
27.95490, 10.3 (A. Amorim, Florianopolis, Brazil);
28.49387, 10.3 (Benn);
28.71389, 10.3 (D. Blane, Henley-on-Klip, South Africa);

Charts: Charts with a comparison star sequence for ASASSN-16ma may
be created using the AAVSO Variable Star Plotter (VSP) at
https://www.aavso.org/vsp. Be sure to include the hyphen and no
spaces in the name, as shown.

Submit observations: Please submit observations to the AAVSO
International Database using the name ASASSN-16ma. Once a GCVS name
is announced in an IAU Circular or CBET, please use that name.

Notes:
a. Designated PNV J18205200-2822100 when posted to the IAU Central
Bureau for Astronomical Telegrams Transient Object Confirmation
Page (TOCP) at http://www.cbat.eps.harvard.edu/unconf/tocp.html.
Most of the information in this Alert Notice is taken from
the TOCP page or ATel #9669
(http://www.astronomerstelegram.org/?read=9669), #9678, #9680, and
#9683.

b. Stanek et al. report no previous outbursts have been detected at
the nova's location since ASAS-SN started observing the Galactic
center in March 2016 (ATel #9669).

c. Position end figures
- ASAS-SN (discovery, 2016 Oct. 25.02 UT): 52.12s, 13.52"
- Sakurai (discovery, 2016 Oct. 26.380 UT): 52.00s, 10.0"
- P. Mroz et al. for OGLE (2016 Oct. 27 UT; ATel #9683): 52.25s,
12.1"

d. Progenitor: R. K. Saito (Universidade Federal de Santa
Catarina) et al. (ATel #9680) report a likely progenitor candidate
is VVV J182052.14-282212.8, located at position end figures 52.141s,
12.79" (0.78 arcsec from the reported nova position). They also
report that photometric flags in the VVV photometry
(https://vvvsurvey.org) as well as visual inspection of the images
show the object may be a blend of two even fainter sources.

However, P. Mroz (Warsaw University Observatory) et al., on behalf of
the OGLE team, conclude that the VVV star cannot be the progenitor,
as measurement of OGLE images taken 2016 October 27 UT show it is
1.16 arcsec from the nova (ATel #9683). They also report the nova is
not seen down to magnitude I=22 on the OGLE deep template image.


Congratulations to the ASAS-SN team and to Yukio Sakurai on this
discovery!


This AAVSO Alert Notice was compiled by Elizabeth O. Waagen.

----------------------------------
SUBMIT OBSERVATIONS TO THE AAVSO

Information on submitting observations to the AAVSO may be found at:
https://www.aavso.org/webobs

ALERT NOTICE ARCHIVE AND SUBSCRIPTION INFORMATION

An Alert Notice archive is available at the following URL:
https://www.aavso.org/alert-notice-archive

Subscribing and Unsubscribing may be done at the following URL:
https://www.aavso.org/observation-notification#alertnotices

-------------------------------------------------
發表於 2016-11-9 08:36:28 來自手機 | 顯示全部樓層
https://www.aavso.org/apps/webobs/results/?star=ASASSN-16ma
發表於 2016-11-9 08:37:33 來自手機 | 顯示全部樓層
零度星系 發表於 2016-11-9 08:36
https://www.aavso.org/apps/webobs/results/?star=ASASSN-16ma

目视星等亮于6等了!
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