1426 Riviera

1426 Riviera, provisional designation 1937 GF, is a bright asteroid from the central regions of the asteroid belt, approximately 16 kilometers in diameter. Discovered by Marguerite Laugier at the Nice Observatory in 1937, the asteroid was later named for the Côte d'Azur, also known as French Riviera.

1426 Riviera
Discovery [1]
Discovered byM. Laugier
Discovery siteNice Obs.
Discovery date1 April 1937
Designations
(1426) Riviera
Named after
French Riviera [2]
(Mediterranean coast)
1937 GF · 1930 UD1
1933 HJ · 1938 SN
1949 HP · 2004 ST12
A920 CA
main-belt · (middle)
background [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc80.50 yr (29,403 days)
Aphelion2.9943 AU
Perihelion2.1690 AU
2.5816 AU
Eccentricity0.1598
4.15 yr (1,515 days)
111.74°
0° 14m 15.36s / day
Inclination9.0632°
335.04°
275.05°
Physical characteristics
Dimensions14.29±0.80 km[4]
15.35 km (derived)[5]
15.44±0.7 km[6]
17.41±0.47 km[7]
17.613±0.110 km[8]
18.033±0.094 km[9]
4.38±0.06 h[10]
4.4±0.1 h[10]
4.40 h[11]
4.4044±0.0002 h[10]
0.2671±0.0290[9]
0.281±0.017[7]
0.3274 (derived)[5]
0.3546±0.037[6]
0.414±0.048[4]
S (assumed)[5]
10.80[4][6][7][9] · 10.9[1][5]

    Discovery

    Riviera was discovered on 1 April 1937, by French astronomer Marguerite Laugier at the Nice Observatory in southeastern France.[12] Two nights later, the asteroid was independently discovered by South African astronomer Cyril Jackson at the Union Observatory in Johannesburg on 3 April 1937. The Minor Planet Center only recognizes the first discoverer.[12] The asteroid was first identified as A920 CA at the German Bergedorf Observatory in February 1920.[12]

    Orbit and classification

    Riviera is a non-family asteroid of the main belt's background population.[3] It orbits the Sun in the central asteroid belt at a distance of 2.2–3.0 AU once every 4 years and 2 months (1,515 days). Its orbit has an eccentricity of 0.16 and an inclination of 9° with respect to the ecliptic.[1] The body's observation arc begins at Johannesburg Observatory in 1937, two weeks after its official discovery observation at Nice.[12]

    Physical characteristics

    Riviera is an assumed stony S-type asteroid.[5]

    Rotation period

    In March 2003, a rotational lightcurve of Riviera was obtained from photometric observations by French amateur astronomers Laurent Bernasconi and Nathanaël Berger. Lightcurve analysis gave a well-defined rotation period of 4.4044 hours with a brightness amplitude of 0.30 magnitude (U=3).[10] Other lightcurves with a concurring period between 4.38 and 4.40 hours were obtained by René Roy, Horacio Correia and by a group of astronomers at the Pico dos Dias Observatory in Brazil (U=2/2/3-).[10][11]

    Diameter and albedo

    According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Riviera measures between 14.29 and 18.033 kilometers in diameter and its surface has an albedo between 0.2671 and 0.414.[4][6][7][8][9]

    The Collaborative Asteroid Lightcurve Link derives an albedo of 0.3274 and a diameter of 15.35 kilometers based on an absolute magnitude of 10.9.[5]

    Naming

    This minor planet was named after the French Riviera (Côte d'Azur), the Mediterranean coast in southeastern France, noted for its mild weather and where the discovering Nice Observatory is located. The asteroid's name was suggested by Frederick Pilcher, after whom 1990 Pilcher was named. The official naming citation was published by the Minor Planet Center on 8 April 1982 (M.P.C. 6831).[2][13]

    References
    1. "JPL Small-Body Database Browser: 1426 Riviera (1937 GF)" (2017-10-01 last obs.). Jet Propulsion Laboratory. Retrieved 26 October 2017.
    2. Schmadel, Lutz D. (2007). "(1426) Riviera". Dictionary of Minor Planet Names – (1426) Riviera. Springer Berlin Heidelberg. p. 115. doi:10.1007/978-3-540-29925-7_1427. ISBN 978-3-540-00238-3.
    3. "Asteroid 1426 Riviera – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 29 October 2019.
    4. 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. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 26 October 2017.
    5. "LCDB Data for (1426) Riviera". Asteroid Lightcurve Database (LCDB). Retrieved 26 October 2017.
    6. 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. Retrieved 22 October 2019.
    7. 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. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 17 October 2019. (online, AcuA catalog p. 153)
    8. 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:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 26 October 2017.
    9. 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. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
    10. Behrend, Raoul. "Asteroids and comets rotation curves – (1426) Riviera". Geneva Observatory. Retrieved 26 October 2017.
    11. Almeida, R.; Angeli, C. A.; Duffard, R.; Lazzaro, D. (February 2004). "Rotation periods for small main-belt asteroids". Astronomy and Astrophysics. 415: 403–406. Bibcode:2004A&A...415..403A. doi:10.1051/0004-6361:20034585. Retrieved 26 October 2017.
    12. "1426 Riviera (1937 GF)". Minor Planet Center. Retrieved 26 October 2017.
    13. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 26 October 2017.

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