Report Time (MST): 06:21 For access to all LTO-Reports go to: http://www-kpno.kpno.noao.edu/cgi-bin/ltoreport
4 Meter Weather Averages
From: UT = 01:00 (MST=6:00 PM) To: UT = 13:00 (MST=6:00 AM)
| Elements | Mean | High | Low | AvDev |
|---|---|---|---|---|
| Air Temperature (°C) | 8.8 | 10.7 | 6.1 | 1.0 |
| Dewpoint Temperature (°C) | -6.9 | 3.2 | -16.3 | 5.3 |
| Relative humidity (%) | 37 | 81 | 14 | 16.8 |
| Wind Speed (mph) | 13.5 | 23.7 | 2.5 | 3.6 |
| Wind Direction (°) | 151 | 341 | 29 | 0.8 |
| 4M Dome Temperature (°C) | 8.8 | 11.1 | 7.6 | 0.6 |
| 4M Dome Dewpoint (°C) | 1.1 | 5.6 | -10.8 | 2.6 |
| 4M Primary Mirror (°C) | 9.7 | 10.3 | 9.1 | 0.3 |
| Weather Comments: | Mostly clear with some scattered cirrus drifting thru all night, mainly during the last hour of the night. The south end of the mountain experienced a spike in humidity at the beginning of the night, forcing those scopes to remain close. Eventually the humidity dropped and it was safe to open. Elsewhere, the humidity continued to drop and by night's end it was below 20%. Mild wind out of the SE. |
|---|---|
| Recognized Hours: | ( 11.5 ) 18 degree twilight + 0.5 hr. |
| Telescope | Observer | Prop. # | Instrument | Detector | Seeing |
|---|---|---|---|---|---|
| 4 Meter | Gontcho a Gontcho, Fanning, Rezaie, R. Zhou, X. Zhou, Honscheid, Kent, Marshall & Abareshi. | --- | DESI | N/A | N/A |
| WIYN | on-site: Logsdon, Everett, McBride, Golub, Bender, Wright, Rajagopal, Monson, Ninan / remote: Percival | 2019B-2001 | NEID | N/A | 1.0 |
| 2.1 Meter | No Observer | --- | N/A | N/A | N/A |
| Feed | No Observer | --- | N/A | N/A | N/A |
| 0.9 Meter | Deliyannis | 2019B-0927 | HDI | N/A | N/A |
| Telescope | Hours Used | Night's Activity | Hours Lost | Time Lost Due To: | Time of Night (MST) | |
|---|---|---|---|---|---|---|
| 4Meter | ||||||
| 11.5 | T and E | |||||
| WIYN | ||||||
| 9.5 | T and E | 2.0 | Weather | 18:30 - 21:00 | ||
| 2Meter | ||||||
| 0.0 | Scientific Research | |||||
| Feed | ||||||
| 0.0 | Scientific Research | |||||
| W0_9m | ||||||
| 11.5 | Other |
| 4 Meter | DESI T&E:: On-sky testing all night. |
|---|---|
| WIYN | NEID T&E:: Lost 2 hours to high humidity at the beginning of the night. Seeing measured between 0.9 and 1.7 arc-seconds, with a typical value of 1. |
| 2.1 Meter | Not Scheduled |
| Feed | Not Scheduled |
| 0.9 Meter | No answer when called at 05:30. Unable to resolve time used. |
| Comments | A very good night for science and T&E. |
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| Reported by: | Christian Soto |
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