C/2000 U5 (LINEAR)
Discovery | |
---|---|
Discovered by | LINEAR 1.0-m reflector (704)[1] |
Discovery date | October 29, 2000 |
Orbital characteristics A | |
Epoch | December 15, 2000 (JD 2451893.5) |
Aphelion | 5600 AU (inbound)[2] N/A (outbound) |
Perihelion | 3.4861 AU (q) |
Semi-major axis | −652.38 AU[3][a] |
Eccentricity | 1.0052[3] 1.0057 (epoch 2008+)[2] |
Orbital period | ~150000 years (inbound)[2] ejection (outbound) |
Inclination | 93.652° |
Last perihelion | March 13, 2000[3] |
Next perihelion | ejection |
C/2000 U5 (LINEAR) is a single-apparition comet discovered on October 29, 2000, by Lincoln Near-Earth Asteroid Research.[1] The comet has an observation arc of 362 days[3] allowing a good estimate of the orbit. C/2000 U5 is, as of 2015, the 13th most hyperbolic comet ever discovered and will leave the Solar System.
Before entering the inner Solar System for a 2000 perihelion passage, C/2000 U5 had a barycentric (epoch 1950-Jan-01) orbit with an apoapsis distance of about 5,600 AU (0.09 ly), and a period of approximately 150,000 years.[2]
The comet came to perihelion on March 13, 2000.[3] As the comet was leaving the inner Solar System, it passed within 0.766 AU of Jupiter on February 3, 2001,[4] Since an epoch of 2000-Dec-06, C/2000 U5 has had a barycentric eccentricity greater than 1,[2] keeping it on a hyperbolic trajectory that will eject it from the Solar System.
The escape velocity from the Sun at Neptune's orbit is 7.7 km/s. By May 2014, the comet was passing Neptune's orbit at 30.1 AU from the Sun continuing its ejection trajectory at 7.8 km/s.[5] In 2029, when it is more than 50 AU from the Sun and beyond the influence of the planets, it will still have a barycentric eccentricity of 1.0057.[2]
Comet C/1980 E1 has an even greater eccentricity.
Notes[]
- ^ C/2000 U5 is on an escape trajectory out of the Solar System, i.e. it has a hyperbolic orbit. For a hyperbolic orbit the semi-major axis is still defined, but is negative. This value cannot be interpreted as average distance from the Sun. The orbital energy is inversely proportional to negative semi-major axis. Objects in hyperbolic orbits have negative semi-major axis, giving them a positive orbital energy.
References[]
- ^ a b Brian G. Marsden (2000-11-01). "MPEC 2000-V02 : COMET C/2000 U5 (LINEAR)". IAU Minor Planet Center. Retrieved 2011-03-12.
- ^ a b c d e f Horizons output. "Barycentric Osculating Orbital Elements for Comet C/2000 U5 (LINEAR)". Solution using the Solar System Barycenter. Ephemeris Type:Elements and Center:@0 (To be outside planetary region, inbound epoch 1950 and outbound epoch 2050)
- ^ a b c d e "JPL Small-Body Database Browser: C/2000 U5 (LINEAR)" (last observation: 2001-10-26; arc: 362 days). Jet Propulsion Laboratory. Retrieved 2011-03-12.
- ^ "JPL Close-Approach Data: C/2000 U5 (LINEAR)" (last observation: 2001-10-26; arc: 362 days). Retrieved 2010-03-12.
- ^ "Horizons Batch: Passing Neptune's orbit at 30.1 AU from the Sun" (Solar escape velocity at 30.1 AU is about 7.67 km/s). JPL Horizons.
External links[]
- Orbital simulation from JPL (Java) / Horizons Ephemeris
- Cometary object articles
- Non-periodic comets
- Astronomical objects discovered in 2000
- Hyperbolic comets