1853 McElroy

1853 McElroyDiscovery[1]

Discovered by| Indiana University
(Indiana Asteroid Program)
Discovery site| Goethe Link Obs.
Discovery date| 15 December 1957
Designations

MPC designation

| (1853) McElroy
Named after| William D. McElroy
(American biochemist)[2]

Alternative designations

| 1957 XE * 1930 YP
1950 NX * 1950 OM
Minor planet category| main-belt * (outer)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc| 66.70 yr (24,364 days)
|{{{apsis}}}|helion}}| 3.2153 AU
|{{{apsis}}}|helion}}| 2.9115 AU

Semi-major axis

| 3.0634 AU
Eccentricity| 0.0496
Orbital period| 5.36 yr (1,958 days)
Mean anomaly| 106.92°
Mean motion| 0° 11m 1.68s / day
Inclination| 15.759°
Longitude of ascending node| 298.77°

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

| 89.936°
Physical characteristics
Dimensions| 17.47±0.64 km[4]
20.89 km (derived)[3]
21.09±0.67 km[5]
21.14±1.0 km[6]
23.807±0.154[7]
24.065±0.282 km[8]
Rotation period| 8.016±0.005 h[9]
8.0229±0.0041 h (R)[10]
8.0262±0.0020 h (R)[10]
Geometric albedo| 0.1937 (derived)[3]
0.197±0.032[7]
0.1986±0.0276[8]
0.2494±0.026[6]
0.261±0.018[5]
0.304±0.055[4]

Spectral type

| X[11] * C[3]
Absolute magnitude (H)| 10.5[5][6][8] * 10.70[4] * 10.766±0.003 (R)[10] * 10.8[1][3] * 10.91±0.26[11]

1853 McElroy, provisional designation 1957 XE, is an asteroid from the outer region of the asteroid belt, approximately 21 kilometers in diameter. It was discovered on 15 December 1957, by the Indiana Asteroid Program at Goethe Link Observatory near Brooklyn, Indiana, United States, and named for American biochemist William D. McElroy.[2][12]

## Contents

* 1 Orbit and classification
* 2 Physical characteristics
* 2.1 Rotation period
* 2.2 Diameter and albedo
* 3 Naming
* 4 References
* 5 External links

## Orbit and classification

McElroy orbits the Sun in the outer main-belt at a distance of 2.9–3.2 AU once every 5 years and 4 months (1,958 days). Its orbit has an eccentricity of 0.05 and an inclination of 16° with respect to the ecliptic.[1]

It was first identified as 1930 YP at Lowell Observatory in 1930. However the observation remained unused and the body's observation arc begins with its official discovery in 1957.[12]

## Physical characteristics

McElroy is characterized as a generic X-type and carbonaceous C-type asteroid by the Lightcurve Data Base and by PanSTARRS' photometric survey, respectively.[3][11]

### Rotation period

Between 2004 and 2011, three rotational lightcurves of McElroy were obtained at Brian Warner's Palmer Divide Observatory and at the Palomar Transient Factory, respectively. Lightcurve analysis gave a rotation period between 8.016 and 8.026 hours with a brightness variation of 0.18–0.30 magnitude ({{{1}}}).[9][10]

### Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, McElroy measures between 17.47 and 24.07 kilometers in diameter, and its surface has an albedo of 0.197 to 0.304.[4][5][6][7][8]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.194 and a diameter of 20.89 kilometers with an absolute magnitude of 10.8.[3]

## Naming

This minor planet was named in honor of American biochemist William David McElroy (1917–1999), chairman of the biology department at Johns Hopkins University during the 1950s and 1960s, later director of the National Science Foundation (NSF) in the early 1970s and chancellor of the University of California at San Diego from until 1980.[2]

During his tenure as director of NSF the U.S. government decided to fund the Very Large Array, now officially known as the Karl G. Jansky Very Large Array.[2] The official naming citation was published by the Minor Planet Center on 1 August 1980 (M.P.C. 5450).[13]

## References

1. ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 1853 McElroy (1957 XE)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001853. Retrieved 8 June 2017.
2. ↑ 2.0 2.1 2.2 2.3 Schmadel, Lutz D. (2007). "(1853) McElroy". Dictionary of Minor Planet Names – (1853) McElroy. Springer Berlin Heidelberg. p. 149. doi:10.1007/978-3-540-29925-7_1854. ISBN 978-3-540-00238-3.
3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 "LCDB Data for (1853) McElroy". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1853|McElroy. Retrieved 13 December 2016.
4. ↑ 4.0 4.1 4.2 4.3 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 13 December 2016.
5. ↑ 5.0 5.1 5.2 5.3 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan 63 (5): 1117–1138. doi:10.1093/pasj/63.5.1117. Bibcode: 2011PASJ...63.1117U. (online, AcuA catalog p. 153)
6. ↑ 6.0 6.1 6.2 6.3 Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode: 2004PDSS...12.....T. https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab. Retrieved 22 October 2019.
7. ↑ 7.0 7.1 7.2 Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R. et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal 791 (2): 11. doi:10.1088/0004-637X/791/2/121. Bibcode: 2014ApJ...791..121M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014ApJ...791..121M. Retrieved 13 December 2016.
8. ↑ 8.0 8.1 8.2 8.3 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D. et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal 741 (2): 25. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M.
9. ↑ 9.0 9.1 Warner, Brian D. (March 2005). "Lightcurve analysis for asteroids 242, 893, 921, 1373, 1853, 2120, 2448 3022, 6490, 6517, 7187, 7757, and 18108". The Minor Planet Bulletin 32 (1): 4–7. ISSN 1052-8091. Bibcode: 2005MPBu...32....4W. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2005MPBu...32....4W. Retrieved 13 December 2016.
10. ↑ 10.0 10.1 10.2 10.3 Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal 150 (3): 35. doi:10.1088/0004-6256/150/3/75. Bibcode: 2015AJ....150...75W. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015AJ....150...75W. Retrieved 13 December 2016.
11. ↑ 11.0 11.1 11.2 Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus 261: 34–47. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V. Retrieved 13 December 2016.
12. ↑ 12.0 12.1 "1853 McElroy (1957 XE)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1853. Retrieved 13 December 2016.
13. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. Retrieved 13 December 2016.

## External links

* Lightcurve plot of 1853 McElroy[Usurped!], Palmer Divide Observatory, B. D. Warner (2004)
* 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
* 1853 McElroy at AstDyS-2, Asteroids—Dynamic Site
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 1853 McElroy at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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