Facilities > GBT > Observing > Statistics

Statistics

by Karen ONeil last modified Apr 25, 2011 by Stephan Witz

Beginning with January 2004 the definition of the recorded astronomy hours changed. The new definitions are:

  • Scheduled hours is the number of hours scheduled on the telescope including any last minute changes.
  • Actual hours is recorded for astronomical observations only and is equal to the scheduled hours minus lost time for astronomy.
  • Lost time refers to the number of scheduled astronomy hours lost to weather, equipment failure or any cause which resulted in either no data being collected or the quality of data severely corrupted.
  • Holiday shutdown periods normally occur in November and December (usually 36 hours each month) and are not included in the numbers.

2001

Month Scheduled Hours Actual Hours
Astronomy Obs Maint & Equip Test & Cal Astronomy Obs Lost Time
January 207 3 *
February 171 229 *
March 10 191 227 10 *
April 10 180 11 *
May 191
June 189
July 191 79
August 26 207 291 44 *
September 116 171 353 175 *
October 62 177 413 67 *
November 27 155 322 33 *
December 50 138 471 68 *

* Lost time will be tracked when major commissioning effort ceases

2002

Month Scheduled Hours Actual Hours
Astronomy Obs Maint & Equip Test & Cal Astronomy Obs Lost Time
January 106 159 453 118 *
February 45 150 478 45 *
March 121 144 465 164 *
April 147 160 407 174 *
May 124 159 285 168 *
June 163 138 422 210 *
July 250 162 334 299 *
August 236 158 324 249 *
September 216 199 307 235 *
October 114 162 345 126 *
November 245 117 322 243 *
December 199 143 366 206 *

* Lost time will be tracked when major commissioning effort ceases

2003

Month Scheduled Hours Actual Hours
Astronomy Obs Maint & Equip Test & Cal Astronomy Obs Lost Time
January 51 136 550 62 *
February 206 171 232 238 *
March 345 151 228 402 *
April 384 163 174 386 50
May 374 140 230 387 59
June 403 184 120 409 56
July 320 224 200 329 28
August 350 189 204 379 20
September 343 186 192 362 31
October 358 133 240 379 21
November 349 99 237 355 53
December 367 121 220 376 57

* Lost time will be tracked when major commissioning effort ceases

2004

Month Scheduled Hours Actual Hours
Astronomy Obs Maint & Equip Test & Cal Astronomy Obs Lost Time
January 557 68 119 462 95
February 414 71 211 343 71
March 478 81 185 424 54
April 433 79 208 395 38
May 417 121 206 382 35
June 356 209 155 338 18
July 409 203 132 363 45
August 400 201 143 370 30
September 392 201 127 349 43
October 442 107 195 402 40
November 423 58 203 397 26
December 482 63 163 447 35

 

2005

Month Scheduled Hours Actual Hours
Astronomy Obs Maint & Equip Test & Cal Astronomy Obs Lost Time
January 529 66 149 466 62
February 460 64 148 401 59
March 505 67 172 434 71
April 492 91 137 454 38
May 551 67 126 536 15
June 465 182 73 445 20
July 520 159 65 495 25
August 434 202 108 413 21
September 507 81 132 490 17
October 545 54 155 521 24
November 478 60 146 448 30
December 537 44 128 477 60

 

2006

Month Scheduled Hours Actual Hours
Astronomy Obs Maint & Equip Test & Cal Astronomy Obs Lost Time
January 571 65 108 519 52
February 529 63 80 460 69
March 613 50 81 583 30
April 622 60 38 592 30
May 610 51 83 592 18
June 484 174 62 475 9
July 557 144 43 533 24
August 468 199 77 453 15
September 563 83 74 554 9
October 593 70 81 566 27
November 526 64 94 510 16
December 589 59 58 563 26

 

2007

Month Scheduled Hours Actual Hours
Astronomy Obs Maint & Equip Test & Cal Astronomy Obs Lost Time
January 635 61 48 595 40
February 569 48 55 470 99
March 634 59 51 568 66
April 625 60 35 558 67
May 526 218 0 500 26
June 373 343 4 367 6
July 509 187 48 504 5
August 241 219 284 230 11
September 302 51 367 292 10
October 617 50 77 593 24
November 573 71 41 537 36
December 591 66 51 530 61

 

2008

Month Scheduled Hours Actual Hours
Astronomy Obs Maint & Equip Test & Cal Astronomy Obs Lost Time
January 620 71 53 594 26
February 600 50 46 542 58
March 654 61 29 627 27
April 633 61 26 610 23
May 638 63 43 616 22
June 545 164 11 513 32
July 538 180 26 488 50
August 538 169 37 520 18
September 618 65 37 601 17
October 633 73 38 605 28
November 567 54 99 509 58
December 561 62 121 505 56

 

2009

Month Scheduled Hours Actual Hours
Astronomy Obs Maint & Equip Test & Cal Astronomy Obs Lost Time
January 624 45 75 551 73
February 551 67 54 497 54
March 635 58 51 596 39
April 606 72 42 577 29
May 635 57 53 609 26
June 491 183 46 468 23
July 529 164 50 509 20
August 542 148 54 532 10
September 504 171 45 493 11
October
November
December