1923 Osiris

1923 OsirisDiscovery[1]

Discovered by| C. J. van Houten
I. van Houten G.
T. Gehrels
Discovery site| Palomar Obs.
Discovery date| 24 September 1960
Designations

MPC designation

| (1923) Osiris
Pronunciation| /əˈsaɪrɪs/[4]
Named after| Osiris (Egyptian mythology)[2]

Alternative designations

| 4011 P-L * 1964 TO2
1966 FR * 1974 KN
1974 KP * 1974 LE
Minor planet category| main-belt[3][1] * (inner)
Sulamitis
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc| 62.70 yr (22,900 days)
|{{{apsis}}}|helion}}| 2.5900 AU
|{{{apsis}}}|helion}}| 2.2813 AU

Semi-major axis

| 2.4356 AU
Eccentricity| 0.0634
Orbital period| 3.80 yr (1,388 days)
Mean anomaly| 269.38°
Mean motion| 0° 15m 33.48s / day
Inclination| 4.9580°
Longitude of ascending node| 353.07°

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

| 106.04°
Physical characteristics
Dimensions| 13.1 km
13.461±0.206[5]
Geometric albedo| 0.031±0.006[5]
0.0591 ± 0.008

Spectral type

| SMASS = C[1]
Absolute magnitude (H)| 13.6[1]

1923 Osiris, provisional designation 4011 P-L, is a dark asteroid from the inner regions of the asteroid belt, approximately 13 kilometers in diameter. It was discovered on 24 September 1960, by Ingrid and Cornelis Johannes van Houten at Leiden, on photographic plates taken by Tom Gehrels at Palomar Observatory in the United States.[3][6] It was named after the Egyptian god Osiris.[2]

## Contents

* 1 Orbit and classification
* 1.1 Palomar–Leiden survey
* 2 Physical characteristics
* 3 Naming
* 4 References
* 5 External links

## Orbit and classification

Osiris orbits the Sun in the inner main-belt at a distance of 2.3–2.6 AU once every 3 years and 10 months (1,388 days). Its orbit has an eccentricity of 0.06 and an inclination of 5° with respect to the ecliptic.[1] Due to a precovery taken at the discovering observatory in 1953, the body's observation arc is extended by 7 years prior to its official discovery observation.[3]

### Palomar–Leiden survey

The 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 Johannes van Houten at Leiden Observatory. The trio are credited with several thousand asteroid discoveries.

## Physical characteristics

In the SMASS classification, Osiris is a carbonaceous C-type asteroid.[1]

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Osiris measures 13.461 kilometers in diameter and its surface has a low albedo of 0.031.[5] As of 2017, no rotational lightcurve has been obtained.[7]

## Naming

This minor planet was named after Osiris, the Egyptian god of vegetation, of the waxing and waning Moon and of the annual flooding of the Nile.[2] The official naming citation was published by the Minor Planet Center on 1 November 1979 (M.P.C. 5013).[8]

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 "JPL Small-Body Database Browser: 1923 Osiris (4011 P-L)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001923. Retrieved 14 June 2017.
2. ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). "(1923) Osiris". Dictionary of Minor Planet Names – (1923) Osiris. Springer Berlin Heidelberg. p. 154. doi:10.1007/978-3-540-29925-7_1924. ISBN 978-3-540-00238-3.
3. ↑ 3.0 3.1 3.2 "1923 Osiris (4011 P-L)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1923. Retrieved 14 June 2017.
4. ↑ "Osiris". Osiris. Oxford University Press. http://www.lexico.com/definition/Osiris.
5. ↑ 5.0 5.1 5.2 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C. et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters 759 (1): 5. doi:10.1088/2041-8205/759/1/L8. Bibcode: 2012ApJ...759L...8M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M. Retrieved 14 June 2017.
6. ↑ "New Names of Minor Planets", Minor Planet Circular (Cambridge, Mass: Minor Planet Center) (MPC 5013), 1 Nov 1979, ISSN 0736-6884, https://www.minorplanetcenter.net/iau/ECS/MPCArchive/1979/MPC_19791101.pdf
7. ↑ "LCDB Data for (1923) Osiris". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1923|Osiris. Retrieved 14 June 2017.
8. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. Retrieved 14 June 2017.

## External links

* Asteroid Lightcurve Database (LCDB), query form (info )
* Dictionary of Minor Planet Names, Google books
* Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
* Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
* 1923 Osiris at AstDyS-2, Asteroids—Dynamic Site
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 1923 Osiris at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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