The target - Cyg X-1 - is being observed by ACIS-S and the High Energy Transmission Grating (HETG) for 2 hours and 46 minutes. The observation started 1 hour ago and ends in 2 hours, and is part of the proposal Simultaneous Chandra and XRISM Spectroscopy of the Multi-Phase Focused Wind in Cygnus X-1. The target - also called HD 226868 - is located in the constellation Cygnus and is a High Mass X-ray Binary. More information on the target can be found at SIMBAD
.
This is a time-critical observation.
This is an observation from a TOO (target of opportunity) proposal.
| Target: | Cyg X-1 |
| SIMBAD Type: | High Mass X-ray Binary |
| Observation Details: | 32378 |
| Sequence Summary: | 402657 |
| Proposal Id: | 27409099 |
| Proposal: | Cycle 27, Director's Discretionary Time, BH AND NS BINARIES |
| Turnaround time: | Immediate |
| Instrument: | ACIS-S, High Energy Transmission Grating (HETG) |
| Chips: | ACIS-5678 |
| Sub Array: | Start: 257 Rows: 512 |
| Data Mode: | GRADED |
| Date: | 20:13 Tuesday, 9 June 2026 (UTC) |
| Exposure (approved): | 2 hours and 46 minutes |
| Right Ascension: | 19h 58m 21.7s |
| Declination: | +35° 12' 05.8" |
| Roll: | 139° |
| Constellation: | Cygnus |
| Time critical: | Yes |
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