Printable finder charts for Irene
| Color schemes | |||
| Date span | Date of opposition | Dark on light | Light on dark |
| Jan 2013 – Jun 2013 | 23 Mar | PNGPDF-RGBPDF-CMYKSVG | PNGPDF-RGBPDF-CMYKSVG |
| Dec 2016 – May 2017 | 20 Feb | PNGPDF-RGBPDF-CMYKSVG | PNGPDF-RGBPDF-CMYKSVG |
| Nov 2020 – Apr 2021 | 25 Jan | PNGPDF-RGBPDF-CMYKSVG | PNGPDF-RGBPDF-CMYKSVG |
| Oct 2024 – Mar 2025 | 3 Jan | PNGPDF-RGBPDF-CMYKSVG | PNGPDF-RGBPDF-CMYKSVG |
| Apr 2026 – Aug 2026 | 15 Jun | PNGPDF-RGBPDF-CMYKSVG | PNGPDF-RGBPDF-CMYKSVG |
| Oct 2028 – Feb 2029 | 15 Dec | PNGPDF-RGBPDF-CMYKSVG | PNGPDF-RGBPDF-CMYKSVG |
| Mar 2030 – Aug 2030 | 22 May | PNGPDF-RGBPDF-CMYKSVG | PNGPDF-RGBPDF-CMYKSVG |
| Feb 2034 – Jul 2034 | 23 Apr | PNGPDF-RGBPDF-CMYKSVG | PNGPDF-RGBPDF-CMYKSVG |
| Jan 2038 – Jun 2038 | 23 Mar | PNGPDF-RGBPDF-CMYKSVG | PNGPDF-RGBPDF-CMYKSVG |
| Dec 2041 – May 2042 | 20 Feb | PNGPDF-RGBPDF-CMYKSVG | PNGPDF-RGBPDF-CMYKSVG |
| Nov 2045 – Apr 2046 | 24 Jan | PNGPDF-RGBPDF-CMYKSVG | PNGPDF-RGBPDF-CMYKSVG |
Credits
The charts above were generated using StarCharter, a command-line tool for producing vector-graphics charts of the night sky, written by the author and freely available for download.
The paths of the planets are taken from the DE430 planetary ephemeris computed by the Jet Propulsion Laboratory (JPL). Planetary positions were extracted from the DE430 files using EphemerisCompute, which was also written by the author, and is also freely available for download.
The positions of asteroids are calculated from orbital elements published by Ted Bowell of the Lowell Observatory. Comet positions are computed from orbital elements published by the Minor Planet Center (MPC).
Star positions and magnitudes were taken from the Hipparcos, Tycho, Tycho-2 and Gaia EDR3 catalogs.