1822 Waterman

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1822 Waterman
Discovery [1]
Discovered by Indiana University
(Indiana Asteroid Program)
Discovery site Goethe Link Obs.
Discovery date 25 July 1950
MPC designation (1822) Waterman
Named after
Alan T. Waterman
(American physicist)[2]
1950 OO · 1943 EB
1953 MA · 1963 TT
main-belt · (inner)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 66.64 yr (24,342 days)
Aphelion 2.5023 AU
Perihelion 1.8378 AU
2.1700 AU
Eccentricity 0.1531
3.20 yr (1,168 days)
Inclination 0.9567°
Physical characteristics
Dimensions 6.054±0.098[4]
6.515±0.060 km[5]
7.46 km (calculated)[3]
7.581±0.002 h[6]
0.20 (assumed)[3]
13.0[5] · 13.1[1][3] · 14.04±0.51[7]

1822 Waterman, provisional designation 1950 OO, is a stony asteroid from the inner regions of the asteroid belt, approximately 6.5 kilometers in diameter.

It was discovered on 25 July 1950, by Indiana University's Indiana Asteroid Program at its Goethe Link Observatory near Brooklyn, Indiana, United States.[8] The asteroid was named after American physicist Alan T. Waterman.[2]

Orbit and classification[edit]

Waterman is a S-type asteroid. It orbits the Sun in the inner main-belt at a distance of 1.8–2.5 AU once every 3 years and 2 months (1,168 days). Its orbit has an eccentricity of 0.15 and an inclination of 1° with respect to the ecliptic.[1] The body's observation arc begins with its official discovery observation, as its first identification, 1943 EB, made at the German Sonneberg Observatory in 1943, remained unused.[8]

Physical characteristics[edit]

Rotation period[edit]

In January 2013, a rotational lightcurve of Waterman was obtained from photometric observation taken at the U.S Etscorn Observatory in New Mexico. It gave a well-defined rotation period of 7.581 hours with a brightness variation of 0.51 magnitude (U=3).[6]

Diameter and albedo[edit]

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Waterman measures between 6.06 and 6.52 kilometers in diameter, and its surface has an albedo between 0.264 and 0.325.[4][5] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 7.46 kilometers with an absolute magnitude of 13.1.[3]


This minor planet was named in honor of American physicist Alan Tower Waterman (1892–1967), who was the first director of the U.S. National Science Foundation. He went to Washington to serve with OSRD (1941–45), ONR (1946–51), and NSF (1951–63), after being an academic physicist for 25 years.[2]

Waterman was awarded the Karl Taylor Compton Gold Medal for distinguished statesmanship in science, the Public Welfare Medal and the Presidential Medal of Freedom.[2][9] The official naming citation was published by the Minor Planet Center before November 1977 (M.P.C. 3825).[10]


  1. ^ a b c d "JPL Small-Body Database Browser: 1822 Waterman (1950 OO)" (2017-03-17 last obs.). Jet Propulsion Laboratory. Retrieved 8 June 2017. 
  2. ^ a b c d Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1822) Waterman. Springer Berlin Heidelberg. p. 146. ISBN 978-3-540-00238-3. Retrieved 15 December 2016. 
  3. ^ a b c d e f "LCDB Data for (1822) Waterman". Asteroid Lightcurve Database (LCDB). Retrieved 15 December 2016. 
  4. ^ a b c 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. arXiv:1406.6645Freely accessible. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 15 December 2016. 
  5. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 15 December 2016. 
  6. ^ a b Klinglesmith, Daniel A., III; Hanowell, Jesse; Risley, Ethan; Janek, Turk; Vargas, Angelica; Warren, Curtis Alan (July 2013). "Etscorn Observed Asteroids: Results for Size Asteroids December 2012 - March 2013". The Minor Planet Bulletin. 40 (3): 154–156. Bibcode:2013MPBu...40..154K. ISSN 1052-8091. Retrieved 15 December 2016. 
  7. ^ 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. arXiv:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 15 December 2016. 
  8. ^ a b "1822 Waterman (1950 OO)". Minor Planet Center. Retrieved 15 December 2016. 
  9. ^ "Public Welfare Medal". National Academy of Sciences. Retrieved 22 August 2016. 
  10. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 15 December 2016. 

External links[edit]