SpaceAtlas Space Object Data
NASA JPL SBDB · 65P

Gunn

Gunn follows a distinctly cometary orbit: an eccentricity of 0.25 carries it from 2.915 AU at perihelion out to 4.855 AU at aphelion.

comet Observations: 3,233
Orbital Period · P
7.66 yr
v(q)
19.5 km/s
v(Q)
11.7 km/s
TJ
2.99
Eccentricity · e
0.2497

Orbit and dynamics

The path is an ellipse reaching 2.915 AU from the Sun at perihelion and 4.855 AU at aphelion, a radial span of 1.94 AU.

Applying Kepler's third law to a = 3.885 AU gives an orbital period of 7.66 yr, or about 2,797 days.

An eccentricity of 0.25 makes the orbit moderately elongated.

The orbital plane is tilted 9.18° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 19.5 km/s at perihelion and falls to 11.7 km/s at aphelion.

Its Tisserand parameter with respect to Jupiter is T_J = 2.99, a standard discriminator between asteroidal and cometary dynamics.

Size and surface

The measured diameter is 10.8 km, a value from direct size determination rather than from brightness alone.

Observation record and orbit quality

The current orbit solution is based on 3,233 observations and has a weighted RMS residual of 0.5687 arcseconds.

Condition code U = 0 means the orbit is very well determined, leaving only a small uncertainty in the future ephemeris.

About these computed values

Orbital periods, perihelion and aphelion speeds, and diameter estimates on this page are computed by SpaceAtlas from the JPL SBDB orbital elements. They are derived quantities, not values copied from the source catalogue.

Orbital Parameters

Semi-Major Axis
3.885 AU
Eccentricity
0.2497
Perihelion
2.915 AU
Aphelion
4.855085 AU
Inclination
9.18°
Orbital Period
— yr
Epoch
2459159.5
Mean Anomaly
143.55°

Orbit diagram

The Sun sits at the focus (orange). Earth's orbit is the grey circle at 1 AU. The red dot marks the object's position at the catalog epoch.

3D orbit (interactive)

Drag to rotate; scroll or pinch to zoom. The Sun is at the focus (orange), Earth's orbit is the grey ring at 1 AU, and the red dot marks the object's current position.

Close approaches

No close approaches to Earth are currently on record for this object.

Physical Parameters

Diameter
10.8 km
Albedo
—
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
—

Orbit Quality

RMS
0.56866
Condition
0
Orbit ID
—
Data source: NASA JPL Small-Body Database . Orbital periods, perihelion and aphelion speeds, and diameter estimates on this page are computed by SpaceAtlas from the JPL SBDB orbital elements. They are derived quantities, not values copied from the source catalogue.

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