Printable finder charts for 88P/Howell
| Color schemes | |||||
| Date span | Estimated date when brightest | Date of perigee | Date of perihelion | Dark on light | Light on dark |
| Feb 1982 – Aug 1982 | 29 May | 5 Sep | 20 May | PNGPDF-RGBPDF-CMYKSVG | PNGPDF-RGBPDF-CMYKSVG |
| Aug 1987 – Feb 1988 | 7 Nov | 19 Apr | 11 Nov | PNGPDF-RGBPDF-CMYKSVG | PNGPDF-RGBPDF-CMYKSVG |
| Feb 1993 – Aug 1993 | 11 May | 17 Sep | 4 May | PNGPDF-RGBPDF-CMYKSVG | PNGPDF-RGBPDF-CMYKSVG |
| Jul 1998 – Jan 1999 | 20 Oct | 25 Apr | 26 Oct | PNGPDF-RGBPDF-CMYKSVG | PNGPDF-RGBPDF-CMYKSVG |
| Jan 2004 – Jul 2004 | 24 Apr | 25 Sep | 18 Apr | PNGPDF-RGBPDF-CMYKSVG | PNGPDF-RGBPDF-CMYKSVG |
| Jul 2009 – Jan 2010 | 3 Oct | 2 May | 10 Oct | PNGPDF-RGBPDF-CMYKSVG | PNGPDF-RGBPDF-CMYKSVG |
| Jan 2015 – Jul 2015 | 7 Apr | 4 Oct | 3 Apr | PNGPDF-RGBPDF-CMYKSVG | PNGPDF-RGBPDF-CMYKSVG |
| Jun 2020 – Dec 2020 | 15 Sep | 11 May | 24 Sep | PNGPDF-RGBPDF-CMYKSVG | PNGPDF-RGBPDF-CMYKSVG |
| Dec 2025 – Jun 2026 | 21 Mar | 10 Oct | 18 Mar | 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.