About Janesick
Janesick is an uncommon asteroid. It has spectral type S and swings within 1.4 AU of the Sun at perihelion.
A Mars-crosser: its orbit reaches in far enough to cut clean across the path of Mars.
Uncommon asteroid 26 EP
Janesick
Position computed live · sbdb
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Live ephemeris
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Score breakdown
· 5 badgesUncommon 34 pts → Rare
- Has a proper name +8
- Barely turning (over 100 hours) +8
- Mars-crosser +5
- Stony asteroid +4
- Asteroid +1
Total score 26
8 more points to reach Rare.
Badges
- Asteroid · +1
- Has a proper name · +8
- Mars-crosser · +5
- Barely turning (over 100 hours) · +8
- Stony asteroid · +4
Trivia
What it actually is
- Its orbit family. A Mars-crosser: its orbit reaches in far enough to cut clean across the path of Mars.
- Closest approach. At its nearest it comes within 1.4 AU of the Sun — inside the orbit of Mars.
- One lap. A single orbit around the Sun takes it about 3.3 years.
- How far it roams. Its orbit swings between 1.4 and 2.99 AU from the Sun.
Sense of scale
- Sense of scale. In everyday terms it is roughly 0.8× the height of Mount Everest.
By the numbers
- Size. Roughly 7.3 km across.
What's in a name
- Named. Notable enough to have earned a proper name, not just a catalogue number.
Properties
- albedo
- 0.29
- aphelion au
- 3
- designation
- 4558
- diameter km
- 7.326
- eccentricity
- 0.363
- full name
- 4558 Janesick (1988 NF)
- h mag
- 12.79
- inclination
- 22.18
- mean motion deg day
- 0.3026
- moid au
- 0.591
- name
- Janesick
- named
- yes
- orbit class
- MCA
- perihelion au
- 1.4
- rotation period h
- 173.4
- semi major au
- 2.197
- spec taxonomy
- S
- spect
- S
How to see it
Like any astronomical target, Janesick 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 Janesick is an uncommon asteroid
Janesick scores 26 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 8 points would lift it into a rarer tier.
That score comes from 5 science badges — Asteroid, Has a proper name, Mars-crosser, Barely turning (over 100 hours) and Stony asteroid — 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.