LtE in CMO #245

From  Rick FIENBERG


@. . . . . . Maurizio et al. --

I think most people would be tickled pink to get a Mars image like this one! May we use it in S&T and/or on our Web site?

 Gary and I just got home. We had a wonderful time with y'all!

Tim Parker: Please send me a sampling of your Coolpix shots ASAP; I would like to use one of them in S&T to illustrate my editorial about my "three nights on Mars.

Don Parker: Please send me a copy of the e-mail you sent out this (Thursday) morning describing last (Wednesday) night's observations.

David Moore: Please send me some video frames when you get a chance.  Ideally, I'd like to see a sequence showing before, during, and after a flare in Edom.        Below you will find the text of the Astro Alert message Gary and I sent out this morning. As soon as I get Don's reply, I'll post something to the IAU CBAT for use in an IAU Circular -- anyone who's already done that should let me know so I don't duplicate effort.

Again, THANKS!

-- Rick

*******************************************************************

*Attention all Mars observers: Flares have been sighted in Edom Promontorium! *

*******************************************************************

In the May 2001 issue of SKY & TELESCOPE (pages 115 to 123), Thomas Dobbins and William Sheehan discussed rare historical observations of bright, star-like flares from certain regions on the planet Mars. They suggested that the flares might be caused by specular reflections of sunlight off water-ice crystals in surface frosts or atmospheric clouds, specifically at times when the sub-Sun and sub-Earth points were nearly coincident and near the planet's central meridian (the imaginary line running down the center of the visible disk from pole to pole).

Based on their analysis, Dobbins and Sheehan predicted that flares like those last reported in 1958 might erupt this week in Edom Promontorium, near the Martian equator at longitude 345 degrees. Dobbins organized an expedition to the Florida Keys, where Mars would ride high in the south under exceptionally steady skies. Expedition members observed the planet using a variety of telescopes nightly beginning June 3rd. No flares were seen for several nights. But on June 7th, beginning around 06:40 UT (2:40 Eastern daylight time), about 80 minutes before Edom crossed the central meridian, the team observed a series of brightenings. Each lasted perhaps 3 to 5 seconds; they occurred sporadically over the next 90 minutes or so, until clouds ended the observations. At times Edom appeared to pulse with a period of 10 to 15 seconds for a minute or two. The flares were seen visually at about 300 power through two homemade 6-inch (15-centimeter) Newtonian reflectors (one f/6, the other f/8) by Dobbins, Donald Parker, Gary Seronik, Rick Fienberg, and David Moore and were recorded on video at 1,400 power through a Meade 12-inch (30-cm) Schmidt-Cassegrain telescope by Parker and Tippy D'Auria. Visually, the flares seemed to cut the dark linear feature Sinus Sabaeus nearly in two. Mars observers in North America, especially the western half, are encouraged to observe the planet visually and to record it on video over the next two or three nights, when conditions will continue to favor flares in Edom.  Clear skies!

-- Rick Fienberg and Gary Seronik,

SKY & TELESCOPE   (7 June 2001 email)


  Rick FIENBERG (S&T, USA)

rfienberg@skypub.com


 Back to the LtE Home Page

 Jump to the LtE Archives