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Lowell Discovery Telescope

Observer Information Pages


COVID-19 Note:

Continuing, limited in-person observing will be supported at LDT.  For those observing remotely, see LDT Remote Observing Notes.

Image: J. Fernandez (Lowell)

Lowell Observatory operates the LDT in partnership with Boston University, University of Maryland, Northern Arizona University, University of Toledo, and Yale University.




The 4.3-m Lowell Discovery Telescope (LDT) is Lowell Observatory's flagship facility at a dark-sky site approximately 40 miles southeast of Flagstaff on the Coconino National Forest.  The telescope is classically scheduled by semester.  See the current call for observing proposals for Lowell Observatory and Partner Institution members.

The facility was constructed as the Discovery Channel Telescope, and was renamed in 2019 in cooperation with Discovery Communications.

Updates (and Old Updates)

UPDATE: The 2024B LDT Schedule has been released.  (2024Jun08)

UPDATE: Check your VPN settings before your next remote observations (2024May14)

UPDATE: Check with staff about the upcoming PypeIt Workshop on June 11. (2024Apr24)

UPDATE: The 2024B LDT Call for Proposals has been released.  (2024Apr11)


The LMI User Manual has been updated.

The new version (v1.8 – 16 November 2023) updates to the PypeIt instructions and introduces the LDT Observer Tools python package.  It is available on the LDT Observer Information Confluence page.

An updated version of the NIHTS User Manual (v1.7) has been released and is available on the LDT confluence pages.  Per the authors, NIHTS User Manual v1.7 includes a couple of revised figures from the NIHTS Commissioning paper. 

The new LDT Observer Information Pages were released, replacing the prior DCT Observer Information Pages.

We have looked into quantifying the delay between when a user requests an image with LMI, and when the shutter actually opens. Details can be found in the write up under the LMI link about the shutter delay. The bottom line is that:

  1. The exposure times are as recorded to within a few hundredths of a second, based on the star streaks.

  2. The shutter throw time in each direction is between roughly 0.1 and 0.2 seconds, meaning that there is also a temporal gradient across all the images.

  3. Formal uncertainty on the measured time offsets are an underestimate of the true variation. The shutter throw time alone means the mid-time varies across the frame systematically by at least 0.1second (added as the systematic uncertainty below).

  4. The shutter opens 2.05 +/- 0.06 (ran) +/- 0.1 (sys) seconds later than the UTCSTART in the image header.

  5. The shutter closes 0.19 +/- 0.06 (ran) +/- 0.1 (sys) seconds earlier than the UTCEND in the image header.

Exposure times should be computed as:

  1. Start time = UTCSTART + 2.05sec

  2. End time = UTCEND - 0.19sec

  3. Mid-time = UTCSTART + 2.05 + EXPTIME/2 or

  4. Mid-time = [(UTCSTART + 2.05) + (UTCEND-0.19)] / 2

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