Mauna Kea Weather Center Seeing Page

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Enter a night:
(Seeing data starts on September 22, 2009)

Last Seeing Data

DIMM

Sep 19, 2018 - 05:28 HST

1.43 arcsec

MASS

Sep 19, 2018 - 04:56 HST

0.38 arcsec

Raw Data

DIMM | MASS | MASS Profile

	Mean Seeing	Min Seeing	Max Seeing	Stnd Dev
DIMM	0.83	0.65	1.33	0.13
MASS	1.21	0.61	2.36	0.42

Please note that currently the MASS software can overestimate the turbulence strength of layers in the case where the scintillation from the layer is strong. This is the case when the layer strength is very strong. We will be implementing a fix to this but in the interim note that the MASS data are preliminary.

The following operating weather thresholds are now in place for the seeing monitor:

Wind < 50 km/hr (27 kts or 31 mph)
Humidity < 85%

Other Data Sources/Products

Satellite

IR:	04 \| 05 \| 06 \| 07 \| 08 \| 09 \| 10 \| 11 \| 12 \| 13 \| 14 \| 15 \| 16 Animation
WV:	04 \| 05 \| 06 \| 07 \| 08 \| 09 \| 10 \| 11 \| 12 \| 13 \| 14 \| 15 \| 16 Animation