5148 Giordano
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| Discovery[1] | |
|---|---|
| Discovered by | C. J. van Houten I. van Houten G. T. Gehrels |
| Discovery site | Palomar Obs. |
| Discovery date | 17 October 1960 |
| Designations | |
| (5148) Giordano | |
Named after | Giordano Bruno[2][3] (Italian friar and heretic) |
| 5557 P-L · 1974 CS 1980 GC1 | |
| main-belt[1] · (outer) background[4] · Themis[3] | |
| Orbital characteristics[5] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 57.33 yr (20,940 d) |
| Aphelion | 3.5690 AU |
| Perihelion | 2.6606 AU |
| 3.1148 AU | |
| Eccentricity | 0.1458 |
| 5.50 yr (2,008 d) | |
| 301.66° | |
| 0° 10m 45.48s / day | |
| Inclination | 1.1261° |
| 346.73° | |
| 227.45° | |
| Physical characteristics | |
| 6.06 km (calculated)[3] 8.112±0.388 km[6][7] 8.5±1.7 km[8] | |
| 7.824±0.0038 h[9] | |
| 0.07±0.03[8] 0.08 (assumed)[3] 0.0889±0.0250[7] 0.089±0.025[6] | |
| C[3] | |
| 13.7[7] · 13.90[5][8] 13.996±0.011 (R)[9] 14.45[3] | |
5148 Giordano, provisional designation 5557 P-L, is a background asteroid from the outer regions of the asteroid belt, approximately 8 kilometers (5 miles) in diameter. It was discovered on 17 October 1960, by Dutch astronomer couple Ingrid and Cornelis van Houten on photographic plates taken by Dutch–American astronomer Tom Gehrels at the Palomar Observatory in California, United States.[1] It was named for Italian friar and heretic Giordano Bruno, who was burned at the stake in Rome in 1600.[2] The presumably carbonaceous Themistian asteroid has a rotation period of 7.8 hours and possibly an elongated shape.[3]
Giordano is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[4] Based on osculating Keplerian orbital elements, the asteroid has also been classified as a Themistian asteroid that belongs to the Themis family (602), a very large family of carbonaceous asteroids, named after 24 Themis.[3]
It orbits the Sun in the outer asteroid belt at a distance of 2.7–3.6 AU once every 5 years and 6 months (2,008 days; semi-major axis of 3.11 AU). Its orbit has an eccentricity of 0.15 and an inclination of 1° with respect to the ecliptic.[5] The body's observation arc begins at Palomar on 24 September 1960, less than a month prior to its official discovery observation.[1]
Physical characteristics
Giordano is an assumed carbonaceous C-type asteroid derived from the overall spectral type for Themistian asteroids.[3]
Rotation period
In September 2010, a rotational lightcurve of Giordano was obtained from photometric observations in the R-band by astronomers at the Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 7.824 hours with a brightness amplitude of 0.60 magnitude, indicative for an elongated shape (U=2).[9]
Diameter and albedo
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Giordano measures 8.112 and 8.5 kilometers in diameter and its surface has an albedo of 0.089 and 0.07, respectively.[6][7][8] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.08 and calculates a diameter of 6.06 kilometers based on an absolute magnitude of 14.45.[3]
Palomar–Leiden survey
The survey designation "P-L" stands for Palomar–Leiden, named after Palomar Observatory and Leiden Observatory, which collaborated on the fruitful Palomar–Leiden survey in the 1960s. Gehrels used Palomar's Samuel Oschin telescope (also known as the 48-inch Schmidt Telescope), and shipped the photographic plates to Ingrid and Cornelis van Houten at Leiden Observatory where astrometry was carried out. The trio are credited with the discovery of several thousand asteroid discoveries.[10]
