Page created: Monday, 19 Oct 2026 20:53:59 UTC

The target - WR21a - is being observed by ACIS-S and the High Energy Transmission Grating (HETG) for 3 hours and 53 minutes. The observation started 8 minutes ago and ends in 4 hours, and is part of the proposal Resolving the Lines of the Massive Colliding Wind Wolf-Rayet Binary WR 21a. The target - also called THA 35-II-42 - is located in the constellation Carina and is a Wolf-Rayet. More information on the target can be found at SIMBAD. See related observations: 31541, 31542, 33517.

View:
The instrument field-of-view on top of the DSS image of the source.The instrument field-of-view on top of the PSPC image of the source.The instrument field-of-view on top of the RASS image of the source.
Target: WR21a
SIMBAD Type: Wolf-Rayet
Observation Details: 33516
Sequence Summary: 201888
Proposal Id: 27200365
Proposal: Cycle 27, Guaranteed-Time Observation, STARS AND WD
Instrument: ACIS-S, High Energy Transmission Grating (HETG)
Chips: ACIS-456789
Data Mode: FAINT
Date: 20:45 Monday, 19 October 2026 (UTC)
Exposure (approved): 3 hours and 53 minutes
Right Ascension: 10h 25m 56.5s
Declination: -57° 48' 43.5"
Roll: 123°
Constellation: Carina

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