Table 4 - 2MASS Hardware and Operations Significant Events Log
Obs. UT Date Survey Day Event
Both: 970301 1 Fiducial date for survey
981218 659 Sampler Data Release
990507 798 First Incremental Data Release
000303 1099 Second Incremental Data Release
000929 1309 All survey tiles scanned at least once
001025 1335 Catalog quality data obtained for all survey scans
010225 1458 Preliminary data processing complete
020207 2017 Final data processing completed
030325 2216 All-Sky Data Release
061220 3582 Extended Mission Data Release
North: 970418 49 First light Mt. Hopkins
970521 82 First survey mode data obtained
970607 99 Camera rotated for optimal dither - First night
of Northern Survey
970724 146 J-band Preamp changed
970803 156 Last night before summer shutdown. Camera warmed.
Flat/dark break.
970828 181 First night of operations after summer shutdown -
test data only. Integration times adjusted
to 52ms R1 and 1.298s R2-R1.
970923 207 New J-band ADC-board installed.
970925 209 ADC cable repaired.
970927 211 New pointing model
971011 225 First night of new calibration strategy (1/hour).
971106 251 Focus mechanism failed.
971107 252 Focus mechanism repaired.
971224 299 Last night before Christmas shutdown. Camera
warmed. Flat/dark break.
980103 309 First night of 1998 operations.
980122 328 Numerous electronics maintenance items.
980411 407 TCS/ICS software updated. Dark sequence shortened.
980412 408 Zener diodes installed to preamps.
Flat/dark break.
980513 439 New twilight sequence. Save 1/5 frames.
980604 461 Telescope recollimation work.
980605 462 PSF break.
980725 512 Last night before summer shutdown. Camera warmed.
Flat/dark break.
980913 562 First day of post-summer shutdown operations.
Telescope recollimation.
980918 567 Recollimation. PSF break.
980925 574 Leach electronics tests.
981021 600 First night with Leach electronics. Flat/dark
break.
981113 623 Camera power supply replaced. Fiber interface
replaced. Jumper changed on camera electronics
card.
981118 628 EPROM changed in Leach electronics controller.
Flat/dark break.
990428 789 Upgrade to Leach electronics software.
Flat/dark break.
990808 891 Last night of operations before summer shutdown.
Camera warm.
990908 922 J temperature controller changed. H clock bias
box changed. Installed spherical mirror
constraints.
990803 886 H-band array replaced.
990909 923 First night of post-summer shutdown operations.
990912 926 Collimation and polar axis alignment.
Flat/dark break. PSF break.
990914 928 Slight collimation adjustment.
990918 932 New capacitors added to H band clock bias.
000512 1169 Telescope pointing work.
000730 1248 Last night of operations before summer shutdown.
000912 1292 Post-Summer startup. No major work. Camera cooled.
001201 1372 Final night of northern survey operations.
010215 1448 Northern camera arrives in Amherst
South: 980305 370 First light for southern facility.
980319 384 First night of Southern Survey operations.
980503 429 Pupil mask slip. Flat/dark break.
990118 689 Zener diodes install in preamps. Changed jumper
on ADC boards. etc. Flat/dark break.
990227 729 First night with Leach electronics.
Flat/dark break.
990508 799 EPROM in Leach controller upgraded.
Flat/dark break.
990911 925 EPROM in Leach controller upgraded.
Flat/dark break.
001005s 1315 Mirror and Window washed
001025s 1335 First day of SMC/LMC campaign
010927 1672 2MASS South Decommissioned
Note - Survey day is measured with respect to the fiducial date of
1 March 1997 UT. Survey operations began at Mt. Hopkins on
survey day 99 and at Cerro Tololo on survey day 370.
[Last Update: 2008 September 3, by R. Cutri]