Changes between Version 50 and Version 51 of RoboDIMM
- Timestamp:
- Oct 25, 2010, 3:32:19 PM (16 years ago)
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RoboDIMM
v50 v51 443 443 === __September 2, 2010__ === 444 444 445 The "static" RoboDIMM is located approximately near the "C" in the "Reber Circle" label on the site plan you sent me. Locations 1 and 2 are 8' and 16', respectively, NE of of the static location. (BTW, there appears to be location issue with respect to the containers because they're definitely further north.) 446 447 Winds all night were light, <3.5 m/s. Throughout the night both RoboDIMMs and the DNSM were looking at stars high in the sky. The DNSM was pointed at Altair all night. Both RoboDIMMs measured Antares during the data taking at Location 1. Around 6:30 UT some high clouds moved in. I believe this accounts for the degradation in seeing and the lack of DNSM data points. Because the DIMMs, particularly the static one, were struggling to keep their stars on the focal plane both were moved to Altair which was further south. 445 448 446 449 * [https://svn.pan-starrs.ifa.hawaii.edu/trac/ipp/attachment/wiki/RoboDIMM/Reber-seeing-9.2.10.jpg Seeing Plot] … … 448 451 === __September 7, 2010__ === 449 452 453 During the RoboDIMM observations I made last night at Reber Circle the wind was 3-6 m/s as measured at the DNSM and out of the SE. After struggling for nearly an hour trying to get the RoboDIMMs to track Vega, a star nearly as close to zenith as Altair, the star the DNSMwas tracking, I gave up and moved to Arcturus which was dropping to 454 the west. The disparity in reported seeing values in the attached plot during this period appear to reflect the difference between the RoboDIMMs and the DNSM in the altitude of their respective target stars. Despite looking through quite a bit of atmosphere the RoboDIMMs seem to be fairly consistent. 455 456 At 7:45 both RoboDIMMs were moved to Vega. The DNSM target star continued to be Altair. The lack of DNSM data points from 6:45-8:45 appear to be due to high clouds. The PS1 observer, Angie, reported high cirrus during the evening. Even without a large number of DNSM data points the r0 values appear to coincide well with those reported by both RoboDIMMs. The two DIMMs were 32 ft apart during the final data set yet seem to agree fairly well. The offsets in values, particularly around 8:45, appear to be due to clock issues. Although the GPS time program is set to synch every minute, around this time I noticed a couple instances where the clocks were nearly 2 minutes apart. For most of the time, it should be noted, the differences are less than 20 sec. 450 457 451 458 * [https://svn.pan-starrs.ifa.hawaii.edu/trac/ipp/attachment/wiki/RoboDIMM/Reber-seeing-9.7.10.jpg Seeing Plot] … … 453 460 === __September 10, 2010__ === 454 461 455 456 462 * [https://svn.pan-starrs.ifa.hawaii.edu/trac/ipp/attachment/wiki/RoboDIMM/Reber-seeing-9.10.10.jpg Seeing Plot] 457 463 464 The attached plots shows data collected from the RoboDIMMs separated by a distance of about 40' on Reber Circle. Winds were close to 6 m/s early in the evening but dropped to just over 2 m/s by the end. High clouds necessitated moving the DIMMs to a number of different targets as well as repeatedly restarting the program and re-acquiring stars. The last hour was spent tracking a star quite low in the sky 465 458 466 === __September 14, 2010__ === 459 467 468 Attached are last nights results. The winds were ~10m/s out of the E-SE during the evening. The static DIMM was sheltered from the wind somewhat by the PS2 containers. I believe this accounts for the differences between the DIMMs between 6:30 and 7. At that time I moved from a Arcturus which was fairly low to Rasalhague which was closer to zenith. Both DIMMs were affected by the wind but the one toward the center was buffeted more. Despite this, it appears that the measurements coincide well and it seems that we can conclude that seeing is relatively consistent across Reber Circle. 460 469 461 470 * [https://svn.pan-starrs.ifa.hawaii.edu/trac/ipp/attachment/wiki/RoboDIMM/Reber-seeing-9.14.10.jpg Seeing Plot] … … 468 477 === __October 14, 2010__ === 469 478 479 In the attached plot the DNSM data is corrected to zenith and converted to FWHM, the RoboDIMM data is converted to FWHM, and the PS1 FWHM is directly out of the DB. Throughout the night the winds were < 5 m/s out of the NE. The large gap in the DNSM data is due to high clouds obscuring Altair. At 8 UT the DNSM moved to Diphda and resumed data collection. The high clouds moved across the RoboDIMM's path to Vega a few times requiring that the DIMMs be restarted. During the time period that RoboDIMM data was collected PS1 was pointed to the SE. 470 480 471 481 * [https://svn.pan-starrs.ifa.hawaii.edu/trac/ipp/attachment/wiki/RoboDIMM/corrected-Reber-seeing-10.14.10.jpg Seeing Plot]
