La Silla - Science Operation Department Observer's Tools & Standards Stars
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version: 1.1 ohainaut 2003-11-30 oh added 2MASS and telluric stars
version: 1.2 epompei 2005-01-12 ela added Julian date converter and JPL ephemeris
version: 1.3 epompei 2005-04-27 ela added extinction coefficient for La Silla (old D1.54 page ---> here)

Positions, Airmass, Almanach...

• Sky Calendar Tool: Sun rise, Sun set, twilights, Moon rise and set for one full month (local mirror for LaSilla)
• Object Seasonal Observability: visibility of an object over a long period
• Digital Sky Survey:
  • Local LaSilla DSS1 (very fast from LaSilla)
  • Full interface at Garching Headquarters (DSS1 and 2)
  • 2MASS all-Sky Infrared Survey
• Airmass, Extinction coefficients, Parallactic angle...:
  • Plots: draw the airmass curves for a list of objects, for a given night
  • Extinction coefficients for La Silla (old danish 1.54m page)
  • Table: airmass for one object over one night, tabular output
• Paralactic Angle Calculator, originally designed for 1.5Dk+DFOSC, but useful for any observations

Units converters and ephemeris:

• JD converter: Converts civil date to julian date and reverse
• Horizons Ephemeris calculator from JPL. The code to use for La Silla is 809.

Fluxes, Magnitudes, Exposure Times:

• Exposure Time Calculators: for HARPS, EMMI, SuSI2, SofI, WFI (and VLT instruments). For the others, see their respective web pages
• Magnitude/Jansky Convertor (from ST-ECF NICMOS), and the Ultimate Magnitude/Flux/Magnitude convertor, from STSci

Standard Stars:

• Optical:
  • Landolt's Standard Fields, with finding charts scanned
  • Photometric Calibration OBs for EMMI, SuSI and EFOSC2 (gZipped PostScript, 2Mb)
  • Optical and UV Spectrophotometric Standards
  • Spectrophotometric Calibration OBs for EMMI (gZipped PostScript, 1.6Mb)
• Infrared
• Photometric Standard Stars: NICMOS and ARNICA
• Spectrophotometric Standards
  • List
  • Maps
• Telluric star search tool (thx Paranal SciOp)
• Siebenmorgen MidIr Standards, and Siebenmorge/Sterzik list

Send comments to <lasilla@eso.org> Last modified: Sat Mar 1 21:36:49 CLST 2008