Observation details: comet 161P/Hartley-IRAS
Daily motion of 161P/Hartley-IRAS
90001107 161P/Hartley-IRAS will remain visible until December 22, when it moves too close to the Sun and temporarily disappears from the night sky.
161P/Hartley-IRAS visibility on 2026-09-27
161P/Hartley-IRAS Visible from evening until sunrise
161P/Hartley-IRAS rise and set timetable
| Time | Elevation | |
Moonrise, 99.8% illuminated  | 16:51 | -7° |
| 161P/Hartley-IRAS rise | 17:25 | |
| Twilight start (−12°) | 17:54 | 5° |
| Astronomical observing session begins | 18:25 | 11° |
| 161P/Hartley-IRAS transit | 22:54 | 43° |
| Astronomical observing session ends | 03:33 | 9° |
| Twilight end (−12°) | 04:03 | 3° |
| 161P/Hartley-IRAS set | 04:23 | |
| Moonset | 06:07 | -21° |
Track 161P/Hartley-IRAS position throughout the night
← 27 September 2026 →
| Time | |
| Altitude | |
| Azimuth |
Shift the map to change the time and observe 161P/Hartley-IRAS changing position in the night sky.
161P/Hartley-IRAS Description
This comet is designated 90001107 161P/Hartley-IRAS, Jupiter-family comet. 161P/Hartley-IRAS completes an orbit around the Sun in 21.5 years. It is currently 0.522 AU (78,069,145 km) from Earth, and is located in the constellation Cetus.Current position in the Solar System: 161P/Hartley-IRAS
| Date | Sun, 27 September 2026 |
| Distance from Earth | 0.52155 AU (78,022,769km) |
| Elongation | 169° |
| Angular diameter | " |
| Magnitude | 14.4 |
Finder Chart for
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| Object name | |
| Field of view | |
| Limiting magnitude | |
| coordinates | 0.20013, -9.86931 |
| Center coordinates | 0.20013, -9.86931 |
Annual motion of 161P/Hartley-IRAS
| Date | Mon, 28 September 2026 |
| Twilight start | 18:23 |
| Twilight end | 03:31 |
| Twilight duration | 9h 8m |
| Rise | 17:09 |
| Set | 04:11 |
| Elevation at transit | 44° |
| Transit time | 22:40 |
| Equatorial coordinates | RA: 00h 01m 05s", Dec: -9° 01' 53s |
| Magnitude | 14 |
| Constellation | Cetus |
The graph summarizes the object’s annual visibility, daily observing windows and transit times.
The vertical axis shows time of day and the horizontal axis shows the days of the year.
The shaded area marks when the object is above the horizon; the white line marks daily transit. You can also view the detailed annual visibility table.
The vertical axis shows time of day and the horizontal axis shows the days of the year.
The shaded area marks when the object is above the horizon; the white line marks daily transit. You can also view the detailed annual visibility table.
Astrometric and Physical Parameters of 90001107 161P/Hartley-IRAS
Coordinates and Visibility
| Right Ascension | 00h 12m 00s |
| Declination | -9° 52′ 10″ |
| Magnitude | 14.4 |
| Constellation | Cetus |
| Elevation | -13.5° |
| Azimuth | 92.2° |
Acknowledgments
Orbital and small-body data are provided by NASA Jet Propulsion Laboratory (JPL) Small-Body Database (SBDB) and Center for Near-Earth Object Studies (CNEOS). These resources support accurate positions, orbits and physical characteristics.