1625 The NORC

1625 The NORC
Discovery [1]
Discovered by S. Arend
Discovery site Uccle – Belgium
Discovery date 1 September 1953
Designations
MPC designation 1625 The NORC
Named after
 The IBM NORC
(Naval Ordnance Research Calculator)[2]
1953 RB · 1929 CA
1935 EN · 1936 QS
1942 RK · 1947 NG
1953 QK · 1954 UL1
A914 SA
main-belt · (outer) [3]
Orbital characteristics [1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 100.75 yr (36798 days)
Aphelion 3.9219 AU (586.71 Gm)
Perihelion 2.4611 AU (368.18 Gm)
3.1915 AU (477.44 Gm)
Eccentricity 0.22886
5.70 yr (2082.5 d)
44.249°
0° 10m 22.332s / day
Inclination 15.556°
320.80°
286.13°
Earth MOID 1.50113 AU (224.566 Gm)
Jupiter MOID 1.60896 AU (240.697 Gm)
Jupiter Tisserand parameter 3.099
Physical characteristics
Dimensions 44.66±2.09 km[4]
55.863±1.536 km[5]
75.11±0.80 km[6]
47.60 km (calculated)[3]
13.959 h (0.5816 d)[1][7]
12.94±0.01 h[8]
13.8113±0.0071 h[9]
18.820±0.770 h[10]
0.065±0.006[4]
0.0414±0.0077[5]
0.023±0.004[6]
0.057 (assumed)[3]
B–V = 0.732
U–B = 0.311
Tholen = C
C [3]
10.34

    1625 The NORC, provisional designation 1953 RB, is a dark, carbonaceous asteroid from the outer region of the asteroid belt, about 48 kilometers in diameter. It was discovered by Belgian astronomer Sylvain Arend at the Royal Observatory of Belgium in Uccle on 1 September 1953.[11]

    The minor planet orbits the Sun at a distance of 2.5–3.9 AU once every 5.70 years (2,082 days). Its orbit shows an eccentricity of 0.23 and is tilted by 16 degrees to the plane of the ecliptic. Measurements of its rotation gave a period of 13–14 hours[7][8][9] and an additional, alternative result from the Intermediate Palomar Transient Factory (iPTF) of 18.820±0.770 hours.[10]

    The C-type asteroid's albedo lies between 0.02 and 0.07, according to the surveys carried out by Akari and WISE/NEOWISE.[4][5][6] Correspondingly, the body's size estimate strongly varies between 45 kilometers (AKARI, albedo of 0.065) and 75 kilometer (NEOWISE, albedo of 0.023).

    It was named after NORC, IBM's first-generation vacuum tube computer built in the 1950s (also see List of vacuum tube computers). NORC, or Naval Ordnance Research Calculator, was the fastest, most powerful electronic computer of its time. Under the direction of Wallace J. Eckert, after whom the asteroid 1750 Eckert is named, NORC performed a vast amount of orbital calculations for minor planet.[2]

    References

    1. 1 2 3 "JPL Small-Body Database Browser: 1625 The NORC (1953 RB)" (2015-06-25 last obs.). Jet Propulsion Laboratory. Retrieved 22 April 2016.
    2. 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1625) The NORC. Springer Berlin Heidelberg. p. 129. ISBN 978-3-540-29925-7. Retrieved November 2015.
    3. 1 2 3 4 "LCDB Data for (1625) The NORC". Asteroid Lightcurve Database (LCDB). Retrieved November 2015.
    4. 1 2 3 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; 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. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved November 2015.
    5. 1 2 3 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved November 2015.
    6. 1 2 3 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; 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. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved November 2015.
    7. 1 2 Higgins, David (January 2011). "Period Determination of Asteroid Targets Observed at Hunters Hill Observatory: May 2009 - September 2010". The Minor Planet Bulletin 38 (1): 41–46. Bibcode:2011MPBu...38...41H. ISSN 1052-8091. Retrieved November 2015.
    8. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (1625) The NORC". Geneva Observatory. Retrieved November 2015.
    9. 1 2 Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; 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. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved November 2015.
    10. 1 2 Chang, Chan-Kao; Ip, Wing-Huen; Lin, Hsing-Wen; Cheng, Yu-Chi; Ngeow, Chow-Choong; et al. (August 2015). "Asteroid Spin-rate Study Using the Intermediate Palomar Transient Factory". The Astrophysical Journal Supplement Series 219 (2): 19. arXiv:1506.08493. Bibcode:2015ApJS..219...27C. doi:10.1088/0067-0049/219/2/27. Retrieved November 2015.
    11. ↑ "1625 The NORC (1953 RB)". Minor Planet Center. Retrieved November 2015.

    External links

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