2009 SE

Short description: Small asteroid and Mars trojan

2009 SEDiscovery

Discovered by| Catalina Sky Survey
Discovery date| 16 September 2009
Designations

MPC designation

| 2009 SE
Minor planet category| Martian L5
Orbital characteristics[1]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc| 3133 days (8.58 yr)
|{{{apsis}}}|helion}}| 1.623684 astronomical unit|AU (242.8997 Gm)
|{{{apsis}}}|helion}}| 1.425261 AU (213.2160 Gm)

Semi-major axis

| 1.524472 AU (228.0578 Gm)
Eccentricity| 0.0650794
Orbital period| 1.88 yr (687.508 d)
Mean anomaly| 240.916°
Mean motion| 0° 31m 25.069s /day
Inclination| 20.6248°
Longitude of ascending node| 6.82030°

|{{{apsis}}}|helion}}

| 354.156°
Earth MOID| 0.42422 AU (63.462 Gm)
Jupiter MOID| 3.5304 AU (528.14 Gm)
Physical characteristics
Mean diameter| 400 m
Geometric albedo| 0.5–0.05 (assumed)
Absolute magnitude (H)| 19.9

2009 SE is a small asteroid and Mars trojan orbiting near the L5 point of Mars (60 degrees behind Mars on its orbit).[2]

## Contents

* 1 Discovery, orbit and physical properties
* 2 Mars trojan and orbital evolution
* 3 Mars trojan
* 4 See also
* 5 References
* 6 Further reading
* 7 External links

## Discovery, orbit and physical properties

2009 SE was first observed on 16 September 2009 by the Catalina Sky Survey (CSS).[3] Its orbit is characterized by low eccentricity (0.065), moderate inclination (20.6°) and a semi-major axis of 1.52 AU.[3] Upon discovery, it was classified as Mars-crosser by the Minor Planet Center. Its orbit is well determined as it is currently (January 2021) based on 56 observations with a data-arc span of 3,133 days.[1] 2009 SE has an absolute magnitude of 19.9 which gives a characteristic diameter of 400 m.[1]

## Mars trojan and orbital evolution

Recent calculations indicate that it is a stable L5 Mars trojan with a libration period of 1430 yr and an amplitude of 70°.[2] The libration amplitude is not similar to that of 5261 Eureka and related objects.[citation needed]

## Mars trojan

L4 (leading):

* (121514) 1999 UJ7 †

L5 (trailing):

* 5261 Eureka (1990 MB) †
* (101429) 1998 VF31 †
* (311999) 2007 NS2 †
* (385250) 2001 DH47
* 2009 SE
* 2011 SC191
* 2011 SL25
* 2011 SP189
* 2011 UB256
* 2011 UN63
* 2016 CP31
* 2018 EC4
* 2018 FC4

## See also

* 2020 VT1

## References

1. ↑ 1.0 1.1 1.2 "JPL Small-Body Database Browser: (2009 SE)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2009SE;cad=1.
2. ↑ 2.0 2.1 de la Fuente Marcos, Carlos; de la Fuente Marcos, Raúl (March 2021). "Using Mars co-orbitals to estimate the importance of rotation-induced YORP break-up events in Earth co-orbital space". Monthly Notices of the Royal Astronomical Society 501 (4): 6007–6025. doi:10.1093/mnras/stab062. Bibcode: 2021MNRAS.501.6007D. https://academic.oup.com/mnras/article-abstract/501/4/6007/6081058.
3. ↑ 3.0 3.1 MPC data on 2009 SE

## Further reading

* Three new stable L5 Mars Trojans de la Fuente Marcos, C., de la Fuente Marcos, R. 2013, Monthly Notices of the Royal Astronomical Society: Letters, Vol. 432, Issue 1, pp. 31–35.
* Orbital clustering of Martian Trojans: An asteroid family in the inner solar system? Christou, A. A. 2013, Icarus, Vol. 224, Issue 1, pp. 144–153.

## External links

* 2009 SE data at MPC.
* 2009 SE at AstDyS-2, Asteroids—Dynamic Site
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info

* v
* t
* e

Small Solar System bodies

Minor planets|

* Designation
* Groups
* List
* Moon
* Meanings of names

Asteroid|

* Aten asteroid
* Asteroid belt
* Family
* Jupiter trojan
* Near-Earth
* Spectral types

Distant minor planet|

* Centaur
* Damocloid
* Neptune trojan
* Trans-Neptunian object
* Detached
* Kuiper belt
* Oort cloud
* Scattered disc

Comets|

* Extinct
* Great
* Halley-type
* Hyperbolic
* Long-period
* Lost
* Main-belt
* Near-parabolic
* Periodic
* Sungrazing

Other|

* Meteoroids

* v
* t
* e

Mars

Outline of Mars

Geography|

| Atmosphere|

* Circulation
* Climate
* Dust devil tracks
* Methane

|

Regions|

* Arabia Terra
* Cerberus (Mars)
* Cydonia
* Eridania Lake
* Iani Chaos
* Olympia Undae
* Planum Australe
* Planum Boreum
* Quadrangles
* Sinus Meridiani
* Tempe Terra
* Terra Cimmeria
* Terra Sabaea
* Tharsis
* Undae
* Ultimi Scopuli
* Vastitas Borealis

Physical
features|

* "Canals" (list)
* Canyons
* Catenae
* Chaos terrain
* Craters
* Fossae
* Gullies
* Mensae
* Labyrinthi
* Mountains
* by height
* Observed rocks
* Outflow channels
* Plains
* Valley network
* Valleys
* Gravity

Geology|

* Brain terrain
* Carbonates
* Chaos terrain
* Color
* Composition
* Concentric crater fill
* Dark slope streak
* Dichotomy
* Fretted terrain
* Geysers
* Glaciers
* Groundwater
* Gullies
* Lakes
* Lava tubes
* Lobate debris apron
* Marsquake
* Meteorites
* on Earth
* on Mars
* Mud cracks
* North Polar Basin
* Ocean hypothesis
* Ore resources
* Polar caps
* Recurring slope lineae (RSL)
* Ring mold craters
* Rootless cones
* Seasonal flows
* Soil
* Spherules
* Surface
* "Swiss cheese" feature
* Terrain softening
* Tharsis bulge
* Volcanology
* Water
* Yardangs

History|

* Amazonian
* Hesperian
* Noachian
* Observation history
* Classical albedo features

Astronomy|

| Moons|

* Phobos
* Stickney crater
* Monolith
* Deimos
* Swift crater
* Voltaire crater

|

Transits|

* Solar eclipses on Mars
* Satellite transits
* Phobos
* Deimos
* Planetary transits
* Earth
* Mercury

Asteroids|

* Mars-crossers
* 2007 WD5
* Trojans
* 5261 Eureka
* 1998 VF31
* 1999 UJ7
* 2007 NS2

Comets|

* C/2013 A1 (Siding Spring) (Mars close approach, 19 Oct 2014)

Exploration|

| Concepts|

* Flyby
* Orbiter
* Landing
* Rover
* Sample return
* Human mission
* Permanent settlement
* Colonization
* Terraforming

|

Missions|

* List of missions to Mars

Advocacy|

* The Mars Project
* The Case for Mars
* Inspiration Mars Foundation
* Mars Institute
* Mars Society
* Mars race

Related|

* Artificial objects on Mars
* Memorials on Mars
* Fiction
* List of films set on Mars
* Martian
* Martian scientist
* Mythology
* Phobos and Deimos in fiction
* Flag of Mars
* Life on Mars
* Sub-Earth
* Timekeeping on Mars
* Darian calendar

* Book
* Category

* v
* t
* e

Small Solar System bodies

Minor planets|

* Designation
* Groups
* List
* Moon
* Meanings of names

Asteroid|

* Aten asteroid
* Asteroid belt
* Family
* Jupiter trojan
* Near-Earth
* Spectral types

Distant minor planet|

* Centaur
* Damocloid
* Neptune trojan
* Trans-Neptunian object
* Detached
* Kuiper belt
* Oort cloud
* Scattered disc

Comets|

* Extinct
* Great
* Halley-type
* Hyperbolic
* Long-period
* Lost
* Main-belt
* Near-parabolic
* Periodic
* Sungrazing

Other|

* Meteoroids

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