Resolve caught iron falling toward a 11-minute pulsar
NASA Science on 18 September 2026 relayed a Science Advances result from XRISM Resolve: ionized iron absorption shifted red, which the team read as plasma racing at about 540000 kilometres per hour toward GX 301-2. The 1 February 2025 stare lasted about 16 hours. Wray 977, a blue hypergiant in Crux about 13000 light-years away, is the mass donor.
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Iron lines shifted toward the pulsar
NASA Science, on 18 September 2026, described what Resolve measured in the Science Advances write-up: highly ionized iron absorption sitting at lower energy than a laboratory rest frame. The observing team treated that redshift as gas falling onto GX 301-2 at about 540000 kilometres per hour, or about 335000 miles per hour. The instrument is a high-resolution X-ray spectrograph, not a camera snapshot of the binary. That speed is an interpretation of the line shift, not a second telescope's independent timing of the same gust. The NASA Science page is the news account used here. No second publisher's own lede of this Resolve stare was found in the bounded check.[1]
A hypergiant feeding a slow pulsar
The stare targeted BP Crucis for about 16 hours on 1 February 2025. Wray 977, the optical companion, is a blue hypergiant of about 40 solar masses and about 60 solar diameters. GX 301-2 itself is a neutron star only about 20 kilometres across, spinning once every 11 minutes. The pair sits about 13000 light-years from Earth in the Southern Cross. Their mutual path lasts 41.5 days. That period, the 16-hour exposure, and the iron-line redshift are all taken from the same NASA Science account of the Resolve observation. They describe one binary, not a survey of many wind-fed pulsars.[1]
A disk that briefly reverses
The team's proposed reading is a messy accretion structure that builds, then comes apart, then for a transit of about four days briefly spins the other way. That mechanism lives in the Resolve spectrum as they model it. It is not a map from a second observatory of the same wind. A reader who wants the instrument paper still has to open Science Advances; the NASA Science page names that venue and reports the wind-fall result. Eigen Radar is not claiming a second newsroom confirmed the four-day reversal.[1]
