Date: Sat, 24 Feb 2001 01:09:46 -0700 From: "Robert R. Howell" <[EMAIL PROTECTED]> Subject: Io Outburst in progress on Feb. 22 X-Sender: [EMAIL PROTECTED] To: IJW Satellite List: ; IO OUTBURST IN PROGRESS IJW Satellite Newsletter -- 2001 # 2 Imke de Pater reports an Io outburst is in progress as of Feb. 22, located at 334 W longitude. She requests that other observers try to monitor the activity. I unfortunately didn't see Imke's request until a few minutes ago, and that longitude is now becoming unavailable as Io rotates, but it will be facing Earth again on Feb. 25 at 16 UT. Please let me and Imke know if you do obtain observations. Here is Imke's message: Submitted to CBAT as an IAU circular: Io Outburst: Imke de Pater, F. Marchis, H. Roe (University of California, Berkeley), B. Macintosh (Lawrence Livermore National Laboratories), S. Acton and D. Le Mignant (Keck Observatory) report an extreme volcanic outburst on Io. The team observed Io with the Adaptive Optics system on the Keck II telescope on UT Feb. 19, 20 and 22, 2001, in J, H and K' bands. On Feb. 20 and 22 the approximately Jupiter facing hemisphere was observed. On Feb. 22 the region to the north-east of Loki was very bright in all J, H, and K' bands. The hot spot is located at a west longitude of 334 $\pm$ 3 degrees, and latitude of 40 $\pm$ 3 degrees North, close to the position of Surt. This region did not show any discernible activity on Feb. 20. On Feb. 22 the K'-magnitude was ~5, and in all 3 bands the spot was detectable even against the sunlit disk of Io. From the J, H and K' photometry the temperature is estimated to be ~1000-1200 K; an H-band spectrum taken at the same time suggests a temperature of ~1700-1800 K. We encourage observers to follow-up on these observations to determine the time evolution of this outburst. ---------------------------------------------------------------------------- Imke de Pater phone: 510-642-1947 Professor of Astronomy fax: 510-642-3411 Professor of Earth and Planetary Science 601 Campbell Hall Email: [EMAIL PROTECTED] University of California Berkeley CA 94720 == You are subscribed to the Europa Icepick mailing list: [EMAIL PROTECTED] Project information and list (un)subscribe info: http://klx.com/europa/
