Alert Notice 748: Observations needed now for re-scheduled HST targets

July 21, 2021

AAVSO Forum threads (scroll to the bottom of a thread for latest posts):
- Campaigns and Observation Reports:
- Young Stellar Objects: https//

Please subscribe to these threads if you are participating in the campaign so you can be updated by the astronomer and by HQ. Join in the discussion or ask questions there!

Further to AAVSO Alert Notice 741, Dr. Fred Walter (Stony Brook University) informs us that the HST observations of two targets that had been put on hold have now been re-scheduled.

The observations will take place tonight and tomorrow:

 - NSV 20468 (Sz 130):     22 Jul 2021 13:17:02 - 22 Jul 2021 21:32:41 UT
 - STc2dJ 160000.6-422158: 23 Jul 2021 04:28:52 - 23 Jul 2021 16:19:45 UT

CCD filtered photometry (BVRI, V in particular) is requested now through July 22 (NSV 20468=Sz 130) or July 23 (SSTC2DJ160000.6-422158).

Name RA (2000.0) Dec (2000.0) Range (from VSX) Mean V (not midpoint)
NSV 20468    (= Sz 130) [Lup] 16 00 31.04 -41 43 37.0 13.9 - 15.1 V 14.7
SSTc2d J160000.6-422158  [Nor] 16 00 00.60 -42 21 56.8 16.4 - 16.7 V 15.9

Finder charts: Finder charts with comparison stars for the targets may be created using the AAVSO Variable Star Plotter (VSP).

Please submit observations to the AAVSO International Database using the names given in the table above.

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


Information on submitting observations to the AAVSO may be found at:
 - Photometry/visual observations:
 - Spectroscopy:


An Alert Notice archive is available at the following URL:

Subscribing and Unsubscribing may be done at the following URL:


Please support the AAVSO and its mission -- Join or donate today: