IM Nor monitoring requested for HST COS observations

Exoplanet occultation, asteroid occultation,
solar research, comet observation, astrometry, etc.
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IM Nor monitoring requested for HST COS observations

文章 PTS » 週六 11 2月, 2017 14:21

AAVSO Alert Notice 567

February 10, 2017

IM Nor monitoring requested for HST COS observations

Dr. Ed Sion (Villanova University) and colleagues have requested
AAVSO observers' assistance in monitoring the symbiotic-type
recurrent nova IM Nor in support of observations with the Hubble
Space Telescope Cosmic Origins Spectrograph scheduled for 2017
February 13 - 17 UT.

These observations are part of a study on short orbital period
recurrent novae as Supernovae Type Ia progenitors.

It is essential to know 24 hours prior to the HST COS observations
that IM Nor is not in outburst, in order to protect the
instrumentation. Also, photometry is needed throughout the HST
window to insure knowledge of the brightness of the system.

Observers are asked to monitor IM Nor with nightly snapshot images
(V preferred) from now through February 20, and to report their
observations promptly. It will be especially important to know the
brightness of IM Nor each night through February 17 UT.

The AAVSO comparison star sequence for IM Nor has been extended so
that IM Nor itself, which is V ~ 18.5 at minimum, can be imaged
without saturating the faintest comparison stars. Stacking may be
necessary to visualize IM Nor. Visual observations, if feasible,
are welcome.

In its original outburst, IM Nor (Nova Nor 1920) reached V ~ 8.5,
as it did in 2002, the year of its only recurrent outburst observed
to date.

Coordinates for IM Nor: 15 39 26.42 -52 19 17.9 (2000.0)

Charts: Charts with a comparison star sequence for IM Nor may be
created using the AAVSO Variable Star Plotter (VSP) at

Please submit observations promptly to the AAVSO International
Database using the name IM NOR. If you see IM Nor brightening,
contact AAVSO Headquarters immediately.

This campaign is being monitored on the AAVSO Observing Campaigns
webpage at and is being
followed on the Campaigns and Observation Reports Forum at

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


Information on submitting observations to the AAVSO may be found at:


An Alert Notice archive is available at the following URL:

Subscribing and Unsubscribing may be done at the following URL: ... ertnotices



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