About P/2017 TW13 (Lemmon)
P/2017 TW13 (Lemmon) is an uncommon comet. It swings within 2.079 AU of the Sun at perihelion.
A Jupiter-family comet, herded by Jupiter's gravity into a short orbit of under twenty years.
Uncommon comet 23 EP
P/2017 TW13 (Lemmon)
Position computed live · sbdb
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Live ephemeris
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Score breakdown
· 4 badgesUncommon 34 pts → Rare
- Has a proper name +8
- Comet +6
- Jupiter-family comet +5
- Steeply tilted orbit (i > 40°) +4
Total score 23
11 more points to reach Rare.
Badges
- Comet · +6
- Has a proper name · +8
- Jupiter-family comet · +5
- Steeply tilted orbit (i > 40°) · +4
Trivia
What it actually is
- Its orbit family. A Jupiter-family comet, herded by Jupiter's gravity into a short orbit of under twenty years.
- Closest approach. At its nearest it comes within 2.08 AU of the Sun — inside the orbit of Jupiter.
- One lap. A single orbit around the Sun takes it about 19.2 years.
- How far it roams. Its orbit swings between 2.08 and 12.25 AU from the Sun.
Standing on it
- Sunlight there. Even at its closest the sunlight is only about 23% as strong as Earth's.
- Tail. Its tail always points away from the Sun, never trailing behind its motion — it is blown, not dragged.
By the numbers
- Made of. A comet is a dirty snowball: water ice, frozen carbon dioxide and dust, held together loosely enough that some simply crumble when the Sun warms them.
What's in a name
- Named. Notable enough to have earned a proper name, not just a catalogue number.
Properties
- aphelion au
- 12.25
- designation
- 2017 TW13
- eccentricity
- 0.7098
- full name
- P/2017 TW13 (Lemmon)
- inclination
- 44.84
- mean motion deg day
- 0.0514
- moid au
- 1.32
- name
- P/2017 TW13 (Lemmon)
- named
- yes
- orbit class
- JFC
- perihelion au
- 2.079
- semi major au
- 7.162
How to see it
Like any astronomical target, P/2017 TW13 (Lemmon) is best seen from a dark site away from city lights, and when it is above the horizon depends on your latitude and the time of year. Because it moves against the background stars, the live position panel on this page tracks where it is right now. The visibility panel above works out tonight's viewing window for your saved location.
Why P/2017 TW13 (Lemmon) is an uncommon comet
P/2017 TW13 (Lemmon) scores 23 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 11 points would lift it into a rarer tier.
That score comes from 4 science badges — Comet, Has a proper name, Jupiter-family comet and Steeply tilted orbit (i > 40°) — each earned for a real, measurable property of the object. Rarity on Spacedle is never random: the more remarkable an object's astrophysics, the more badges it collects, the higher it scores, and the rarer it ranks.