Orange (529)
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| Name | Orange (529) |
| Provisional designation | 1904 OM |
| Discoverer | Max Wolf |
| Discovery site | Heidelberg Observatory |
| Discovery date | 20 March 1904 |
| Mp category | Main-belt asteroid |
| Epoch | 31 July 2016 (JD 2457600.5) |
| Semimajor axis | 2.7865 AU |
| Perihelion | 2.6805 AU |
| Aphelion | 2.8925 AU |
| Eccentricity | 0.0372 |
| Orbital period | 4.65 yr (1700 d) |
| Inclination | 10.372° |
| Mean anomaly | 41.0° |
| Asc node | 189.34° |
| Arg peri | 92.1° |
| Dimensions | ~25 km |
| Absolute magnitude | 10.7 |
| Rotation period | 5.42 h |
Orange (529) is a minor planet located in the main asteroid belt between Mars and Jupiter. Discovered in 1904 at Heidelberg Observatory by Max Wolf, it follows a low-eccentricity orbit with a semimajor axis near 2.79 AU and completes one revolution in about 4.65 years. The body has been observed by a variety of observatories and featured in photometric campaigns to determine its rotation and surface properties.
Discovery and designation
Orange was discovered on 20 March 1904 by Max Wolf at the Heidelberg Observatory, a prolific site for early asteroid discoveries associated with the Heidelberg-Königstuhl State Observatory. The provisional designation assigned at discovery was 1904 OM, following the contemporary scheme used by the International Astronomical Union predecessors and cataloguing practices of the Astronomisches Rechen-Institut. Subsequent numbering placed it in the canonical minor planet sequence as number 529. The discovery occurred in the era when photographic techniques pioneered by Wolf at Heidelberg enabled systematic surveys that yielded numerous objects later numbered and named by the Royal Astronomical Society and cataloged in the Minor Planet Center archives.
Orbit and classification
Orange orbits within the main asteroid belt and is dynamically classified as a background or non-family asteroid rather than a member of a tightly bound collisional family such as the Flora family or Eos family. Its semimajor axis of approximately 2.7865 AU places it in the central belt near orbital zones populated by asteroids like 8 Flora and 15 Eunomia clusters. The orbital eccentricity of ~0.037 and inclination near 10.37° yield a relatively circular, moderately inclined path that avoids close resonances with Jupiter such as the 3:1 Kirkwood gap near 2.5 AU. Long-term integrations assessing proper elements reference methodologies developed by researchers affiliated with institutions like the Jet Propulsion Laboratory and the Copenhagen University astronomical groups to confirm its classification.
Physical characteristics
Photometric and infrared surveys indicate an effective diameter on the order of 20–30 km, with published values commonly quoted near 25 km based on albedo assumptions from the Infrared Astronomical Satellite and subsequent missions. Its absolute magnitude (H) is listed around 10.7, implying moderate reflectivity when combined with typical C-type or S-type albedo ranges determined by taxonomic analyses from the Small Main-Belt Asteroid Spectroscopic Survey and the SMASS program. Spectral data are limited but have been compared against templates used by teams at NASA and the European Space Agency to infer surface composition; interpretations remain tentative due to the paucity of high-resolution spectra. Thermal models applied by groups at the Max Planck Institute for Solar System Research and the California Institute of Technology have been used to estimate thermal inertia and regolith properties, suggesting a surface consistent with other mid-sized main-belt asteroids bearing a fine particulate layer.
Naming and etymology
The asteroid received the name "Orange" following early 20th-century conventions of naming minor planets after mythological figures, places, colors, or notable terms. The choice of the name was recorded in periodical bulletins distributed by institutions such as the Astrophysical Journal and enumerated in catalogues maintained by the Harvard College Observatory and the Royal Astronomical Society. The etymology may reference the color or the geographic name, aligning with naming practices that included references to cities, provinces, and natural objects; however, contemporary documentation does not definitively link the name to a single referent among possibilities such as the House of Orange or the fruit descriptor. Official naming citations were later incorporated into compilations produced by the Minor Planet Center and summarized in the Dictionary of Minor Planet Names.
Observation history and lightcurve studies
Observational coverage of Orange spans over a century, with astrometric measurements archived at the Minor Planet Center and photometric observations reported in journals like Icarus and Astronomy and Astrophysics. Lightcurve photometry campaigns conducted by observer networks including the Palomar Observatory teams, amateur-professional collaborations coordinated through the Association of Lunar and Planetary Observers, and programs at the Lowell Observatory produced rotational period estimates. A commonly cited rotation period near 5.42 hours emerged from combined datasets, with amplitude variations indicative of a moderately elongated shape or albedo heterogeneity; these results were cross-referenced against databases maintained by the Lightcurve Database and the Collaborative Asteroid Lightcurve Link. Occultation events recorded by organizations such as the International Occultation Timing Association provided additional constraints on size and projected silhouette, while ongoing sky surveys including Pan-STARRS and the Sloan Digital Sky Survey contributed multi-band photometry to refine color indices and taxonomic classification.
Category:Minor planets