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Observations of V1656 Sco (ASASSN-16kd) needed during dust formation

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發表於 2016-10-27 11:40:37 | 顯示全部樓層 |閱讀模式
AAVSO Special Notice #424

October 26, 2016

Observations of V1656 Sco (ASASSN-16kd) needed during dust formation

Further to AAVSO Alert Notice 550
(https://www.aavso.org/aavso-alert-notice-550), observations of
the nova V1656 Sco (ASASSN-16kd = Nova Sco 2016 No. 2 = PNV
J17225112-3158349) are requested beginning at once.

Dr. Fred Walter (Stony Brook University (SUNY)) reports that this
nova, discovered in September 2016, appears to have entered the
dust-making phase, according to K- and H-band data obtained with
the Andicam imager on the SMARTS 1.3-m telescope at CTIO (ATel
#9673).

Dr. Walter reports that "On MJD 57686.50 [2016 October 25.0 UT]
the BVRIJHK magnitudes were 17.2, 16.0, 13.6, 13.0, 10.6, 9.5, and
7.9, respectively. There is no evidence for a dust dip at optical
wavelengths. Since 3 October the BVRIJ brightnesses have faded
monotonically by 0.05 ± 0.01 mag/day."

Multicolor photometry (BVRIJHK) is requested at least until V1656
Sco is lost behind the Sun. A cadence of a few to several times
per night is suggested, with a S/N sufficient for good resolution.
Visual observations are also welcome, although the V faintness of
the nova may make these unfeasible.

Coordinates (2000.0):  R.A. 17 22 51.46  Dec. -31 58 37.1

Charts: Charts with a comparison star sequence for V1656 Sco may
be created using the AAVSO Variable Star Plotter (VSP) at
https://www.aavso.org/vsp.

Please submit observations to the AAVSO International Database
using the name V1656 SCO.


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

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

Information on submitting observations to the AAVSO may be found at:
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SPECIAL NOTICE ARCHIVE AND SUBSCRIPTION INFORMATION

A Special Notice archive is available at the following URL:
https://www.aavso.org/special-notice-archive

Subscribing and Unsubscribing may be done at the following URL:
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