A radio signal traces comet MAPS before its breakup
Radio observations track April gas outbursts; the inferred mass loss depends on modelling assumptions.
New analysis, earlier event
A manuscript posted on 2 November reports hydrogen cyanide (HCN) in comet C/2026 A1 (MAPS), observed on 1–3 April before its 4 April breakup. The analysis concerns earlier events.[paper][record]
Its authors report two outbursts and the first HCN detection in a Kreutz sungrazer. The arXiv record lists acceptance by Astronomy & Astrophysics.[paper][record]
Why observe with a radio dish?
IRAM’s 30-metre telescope stands on Pico Veleta in Spain’s Sierra Nevada. It collects millimetre radiation across frequencies from 80 to 370 gigahertz. Its dish and specialised instruments provide a different view of celestial sources from ordinary visible-light pictures; IRAM describes simultaneous observations at several wavelengths.[iram]
Detection and interpretation
The mass estimate assumes a 0.4-kilometre nucleus diameter, comet-like density and an HCN-to-water ratio. Gas alone yields about 0.4% loss; adding dust at twice the gas mass raises it to 1.2%. The authors suggest outgassing contributed to breakup; they do not establish one exclusive cause.[paper]
This AI-assisted explanation uses the original manuscript and IRAM’s facility description. No source image is reproduced.[paper][iram]
Read the references
Sources & further reading
- HCN detection in the Kreutz sungrazing comet C/2026 A1 (MAPS) shortly before its disruptionGodard Palluet and colleagues / arXivPublished November 2, 2026Accessed November 3, 2026
Original observations, outburst analysis and model assumptions.
- Manuscript record and submission historyarXivPublished November 2, 2026Accessed November 3, 2026
Records submission time and the authors’ stated journal acceptance.
- The 30-meter telescopeIRAMAccessed November 3, 2026
Facility location, observing wavelengths and dish design.