It's time for another two-month update! This time we are pleased to announce a number of small features designed to increase the flexibility of how you use OPUS.
New Units and Formats
We have added new units and display formats for longitude- and latitude-like fields (including right ascension, declination, and solar hour angles). Depends on the field, you can now select:
- Decimal degrees
- DMS (degree-minute-second)
- Decimal hours
- HMS (hour-minute-second)
- Decimal radians
DMS or HMS can be entered in various free-form formats like 12d 53' 6.23'' or 12h 30m 0s. The format is automatically detected, so even if you have selected "decimal degrees" as the unit, you can still enter the value in DMS or HMS format. If you enter a value in degrees while DMS or HMS is selected, the value is automatically converted, giving a very convenient way to convert degrees to DMS and hours to HMS (or vice versa) even if you don't plan to use OPUS to do a search! We also support a variety of Unicode characters for the degrees symbol, ', and '', which allows convenient copy-paste from web pages, including Wikipedia.
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We have also added new formats to date-time fields. Dates may be entered and/or displayed as:
- YMDhms - Year, month, day, hour, minute, second (1981-07-19T19:30:22.520)
- YDhms - Year, day of year, hour, minute, second (1981-200T19:30:22.520)
- Julian Date - The number of elapsed days since noon on Monday, January 1, 4713 BCE. Each period from one noon to the next counts as one day, regardless of whether that day contains leap seconds. As a result, some days are longer than others. (JD2444805.31276065)
- Julian Ephemeris Date - Similar to SPICE Ephemeris Time but in units of days instead of seconds (JED2444805.31336462)
- Modified Julian Date - Julian Date minus 2400000.5 (MJD44804.81276065)
- Modified Julian Ephemeris Date - JED minus 2400000.5 (MJED44804.81336462)
- SPICE Ephemeris Time - The time unit used by the SPICE toolkit, defined as the number of elapsed seconds since noon on January 1, 2000, and adjusted for relativistic effects that cause a clock on the Earth to vary in speed relative to one at the solar system barycenter. (-582308925.296)
Selection of Download Format
We have added a couple of options to the Download Options on the Cart tab. It is now possible to select the type of archive file (.zip, .tar, or .tgz) as well as the archive's internal file structure. The default is "flat", which is the previous behavior. With "flat" selected, all selected data products are placed in the root level of the archive file. There is a minor change though: if two different files have the same base filename, such that placing them in the root would cause a duplicate filename, they are now added to the archive using their full directory path as stored in the RMS archive. If "flat" is unselected, then all data products in the archive are stored using their full directory paths, completely mirroring the structure of the RMS archive.
Adding or Removing an Observation from the Cart on the Detail Tab
We have added the ability to add or remove an observation from the cart on the Detail tab. In addition, the header of the Detail tab is now frozen so that it is always visible.
Minor Metadata Changes
We have made a number of minor changes to the metadata and the available file products. These include fixing a bug with the wavelength of HST STIS observations and adding superseded-processing products to the available Galileo SSI download products. These changes are unlikely to be visible to most users.
As always we actively solicit your questions, feedback, and comments. Feel free to send a DM on Twitter or use the Feedback tab found on the right side of the OPUS screen, or start a chat with one of our team members. No question or comment is too small. We hope you and your family are staying safe and healthy as we all look forward to returning to a more normal life soon.
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