2005 TN74

Infobox Planet | discovery=yes | physical_characteristics=yes | bgcolour=#FFFFC0
name=mp|2005 TN|74
discoverer=Scott S. Sheppard, Chad Trujillo
discovered=
mp_name=
alt_names=mp|2005 TN|74
mp_category=
orbit_ref = cite web
title=JPL Small-Body Database Browser: 2005 TN74
url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2005TN74
accessdate=2008-05-11]
epoch=May 14 2008
semimajor=42.4 AU
perihelion=32.1 AU
aphelion=52.8 AU
eccentricity=0.243
period=276.91 yr
inclination=2.17°
asc_node=179.2°
arg_peri=223.7°
mean_anomaly=341.7°
avg_speed=
dimensions=85 to 240 km
mass=
density=
sidereal_day=
spectral_type=
abs_magnitude=7.2
albedo=
single_temperature=

mp|2005 TN|74 (also written 2005 TN74) is a Trans-Neptunian object (TNO) [Most SDOs have a perihelion distance greater than 35AU and an eccentricity of more than 0.3.] in a 3:5 resonance with Neptune.cite web
date=2006 Oct. 5
title=MPEC 2006-T35 : 2005 PR21, 2005 PT21, 2005 PU21, 2005 TN74
publisher=Minor Planet Center
author=Wasserman, L. H.; Buie, M. W.; Marsden, B. G.
url=http://www.cfa.harvard.edu/mpec/K06/K06T35.html
accessdate=2008-05-12] It was discovered by Scott S. Sheppard and Chadwick A. Trujillo in 2005.

It was initially suspected of being a Neptune Trojan since the first observations gave it a semi-major axis of 30 AU and an orbital eccentricity of 0.16.cite web
date=2005 Oct. 31
title=MPEC 2005-U97 : 2005 TN74, 2005 TO74
publisher=Minor Planet Center
author=Sheppard, S. S.; Trujillo, C. A.; Marsden, B. G.
url=http://www.cfa.harvard.edu/mpec/K05/K05U97.html
accessdate=2008-05-12] But further observations showed it has a semi-major axis of 42 AU (compared with ~30 AU for Neptune), a perihelion of 32 AU, and an aphelion of 52 AU.

It has an orbital eccentricity of 0.24, which is much more than any currently known Neptune trojan.cite web
title=List Of Neptune Trojans
publisher=Minor Planet Center
url=http://cfa-www.harvard.edu/iau/lists/NeptuneTrojans.html
accessdate=2008-05-11]

With an absolute magnitude of 7.2, it has a diameter in the range of 85 to 240 km.cite web
title=Absolute Magnitude (H)
url=http://neo.jpl.nasa.gov/glossary/h.html
accessdate=2008-05-11]

It has been observed 17 times over 3 oppositions.

References

External links

* [http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2005TN74;orb=1;view=Far Orbital simulation] from JPL (Java) / [http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2005TN74 Ephemeris]