| Minorplanet: | yes |
| 5254 Ulysses | |
| Background: |
|
| Discovery Ref: |   |
| Discovered: | 7 November 1986 |
| Mpc Name: | (5254) Ulysses |
| Alt Names: | 1990 FN |
| Adjective: | Ulysseian, Ulyssian |
| Named After: | Ulysses |
| Mp Category: | Jupiter trojan  |
| Orbit Ref: |   |
| Epoch: | 23 March 2018 (JD 2458200.5) |
| Uncertainty: | 0 |
| Observation Arc: | 31.53 yr (11,518 d) |
| Perihelion: | 4.6052 AU |
| Semimajor: | 5.2366 AU |
| Eccentricity: | 0.1206 |
| Period: | 11.98 yr (4,377 d) |
| Mean Motion: | / day |
| Inclination: | 24.195° |
| Asc Node: | 76.038° |
| Arg Peri: | 343.01° |
| Jupiter Moid: | 0.4529 AU |
| Tisserand: | 2.8100 |
| Mean Diameter: | |
| Rotation: | |
| Albedo: | |
| Abs Magnitude: | 8.80 9.1 9.20 |
5254 Ulysses is a large Jupiter trojan from the Greek camp, approximately 78km (48miles) in diameter. It was discovered on 7 November 1986, by Belgian astronomer Eric Elst at the Haute-Provence Observatory in Saint-Michel-l'Observatoire near Marseille, southeastern France. The assumed C-type asteroid belongs to the 40 largest Jupiter trojans and has a longer-than-average rotation period of 28.72 hours. It was later named after "Ulysses", the Latinized name of the legendary hero from Greek mythology, Odysseus.
Ulysses is a dark Jovian asteroid orbiting in the leading Greek camp at Jupiter's Lagrangian point, 60° ahead of its orbit in a 1:1 resonance (see Trojans in astronomy). It is also a non-family asteroid in the Jovian background population.
It orbits the Sun at a distance of 4.6–5.9 AU once every 11 years and 12 months (4,377 days; semi-major axis of 5.24 AU). Its orbit has an eccentricity of 0.12 and an inclination of 24° with respect to the ecliptic. The asteroid's observation arc begins with its discovery observation in November 1986.
Ulysses is an assumed, carbonaceous C-type asteroid. Its V–I color index of 0.97 is typical for most D-type Jupiter trojans.
In September 1994, photometric observations of Ulysses were made by astronomers Stefano Mottola and Uri Carsenty at ESO's La Silla Observatory, Chile, using the Bochum 0.61-metre Telescope. The observations were used to build a lightcurve showing a well-defined rotation period of 28.72 hours with a brightness variation of 0.32 magnitude . In March 2014, another rotational lightcurve was obtained in the R-band by astronomers at the Palomar Transient Factory, California, which gave a concurring period of 28.7840 hours with an amplitude of 0.33 magnitude . While not being a slow rotator, Ulysses period longer than the 2 to 20 hours measured for most asteroids.
According to the surveys carried out by the Infrared Astronomical Satellite (IRAS), the Japanese Akari satellite, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Ulysses measures between 76.15 and 80.00 kilometers in diameter and its surface has an albedo between 0.058 and 0.087. The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0608 and a diameter of 77.93 kilometers based on an absolute magnitude of 9.2.
This minor planet is named after Ulysses, the Latinized name of Odysseus, who is the hero in Homer's Iliad and Odyssey, the two major ancient Greek epic poems. In the Trojan War, he killed the Trojan Diomedes, restored the command of King Agamemnon and rallied the tired Greeks. Odysseus also thought of building the great wooden Trojan Horse.
After the war, he went on a nine-year-long adventurous journey and met the young and pretty Nausicaa, as narrated in the Odyssey. The famous novel Ulysses by Irish poet James Joyce is also titled after Odysseus Latinized name. For reference, also see the minor planets 1143 Odysseus, 5700 Homerus, 911 Agamemnon, 1437 Diomedes, 192 Nausikaa and 5418 Joyce. The approved naming citation was published by the Minor Planet Center on 10 November 1992 .