1269 Rollandia
Discovery[1]
Discovered byG. Neujmin
Discovery siteSimeiz Obs.
Discovery date20 September 1930
Designations
(1269) Rollandia
Pronunciation/rɒˈlændiə/
Named after
Romain Rolland[2]
(French writer)
1930 SH · 1926 GC1
1931 VY · 1936 LE
1961 PB · A902 EA
A906 SA · A907 WB
A918 EG
main-belt · (outer)[1]
Hilda[3][4] · background[5]
Orbital characteristics[1]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 0
Observation arc117.19 yr (42,804 d)
Aphelion4.2910 AU
Perihelion3.5136 AU
3.9023 AU
Eccentricity0.0996
7.71 yr (2,816 d)
352.88°
0° 7m 40.44s / day
Inclination2.7586°
134.71°
19.460°
Jupiter MOID0.7004 AU
TJupiter3.0550
Physical characteristics
Mean diameter
104.893±0.624 km[6]
105.19±2.8 km[7]
107.85±1.66 km[8]
17.36±0.01 h[4]
0.045±0.002[8]
0.0473±0.003[7]
0.048±0.000[6]
Tholen = D[1][4]
B–V = 0.775[1]
U–B = 0.271[1]
8.7[3]
8.82[1][7][8]

    1269 Rollandia, provisional designation 1930 SH, is a dark Hildian asteroid from the outermost region of the asteroid belt, approximately 105 kilometers (65 mi) in diameter.[4] It was discovered on 20 September 1930, by Soviet astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula.[3] The asteroid was named after French writer Romain Rolland.[2] The D-type asteroid has a rotation period of 17.4 hours. It was one of the last 100-kilometer sized asteroids discovered in the main belt.

    Orbit and classification

    Rollandia is a member of the orbital Hilda group, which stay in a 3:2 orbital resonance with Jupiter and are located in the outermost main belt.[3][4] It is however not a member of the collisional Hilda family (001) but a non-family asteroid of the background population when applying the hierarchical clustering method to its proper orbital elements.[5]

    Rollandia orbits the Sun at a distance of 3.5–4.3 AU once every 7 years and 9 months (2,816 days; semi-major axis of 3.9 AU). Its orbit has an eccentricity of 0.10 and an inclination of 3° with respect to the ecliptic.[1] The asteroid was first observed as A902 EA at Heidelberg Observatory in March 1902. The body's observation arc also begins at Heidelberg in November 1917, with its observation as A907 WB, almost 13 years prior to its official discovery observation at Simeiz.[3]

    Naming

    This minor planet was named after French writer Romain Rolland (1866–1944), who was awarded the Nobel Prize in Literature in 1915 (see list). The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 116).[2]

    Physical characteristics

    In the Tholen classification, Rollandia is a D-type asteroid. This spectral type is common among outermost asteroids and Jupiter trojans and is known for its very low albedo (see below).[1][4]

    Rotation period

    In August 2016, a rotational lightcurve of Rollandia was obtained from photometric observations by Brian Warner, Robert Stephens and Dan Coley at the Center for Solar System Studies at Landers, California (U80−U82). Analysis gave a bimodal lightcurve with a rotation period of 19.98 hours and a low brightness amplitude of 0.06 magnitude. An alternative monomodal period solution of 9.99 hours is also possible, and becomes more likely if the object is nearly spheroidal (U=2).[9][lower-alpha 1] In April 2019, Warner re-visited the object an obtained a period of 17.36 hours. This result supersedes previous observations that gave a period of 15.32, 15.4 and 30.98 hours, respectively (U=2/2/2).[10][lower-alpha 2][lower-alpha 3]

    Diameter and albedo

    According to the surveys carried out by the Japanese Akari satellite, the Infrared Astronomical Satellite IRAS, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Rollandia measures between 104.893 and 107.85 kilometers in diameter and its surface has an albedo between 0.045 and 0.048.[6][7][8]

    The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0473 and a diameter of 105.19 kilometers based on an absolute magnitude of 8.82.[4][7] Based on current estimates, Rollandia was the penultimate asteroid discovered in the outer asteroid belt that was larger than 100 kilometers. The last such body was 1390 Abastumani (101 km), discovered in 1935.

    Notes

    1. ↑ Lightcurve plot of (1269) Rollandia by Warner, Stephens Coley (2016) at CS3. Rotation period of 19.98±0.02 hours. Summary figures at LCDB
    2. ↑ Franco (2012) web: observation from 21 March 2012 gave a rotation period 15.4±0.1 hours with a brightness amplitude of 0.08±0.01 mag. Quality Code of 2. Summary figures for (1269) Rollandia at LCDB
    3. ↑ Slyusarev (2012): observation from gave a rotation period 30.98±0.93 hours with a brightness amplitude of 0.02 mag. Summary figures for (1269) Rollandia at LCDB

    References

    1. 1 2 3 4 5 6 7 8 9 "JPL Small-Body Database Browser: 1269 Rollandia (1930 SH)" (2019-05-12 last obs.). Jet Propulsion Laboratory. Retrieved 29 October 2019.
    2. 1 2 3 Schmadel, Lutz D. (2007). "(1269) Rollandia". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 105. doi:10.1007/978-3-540-29925-7_1270. ISBN 978-3-540-00238-3.
    3. 1 2 3 4 5 "1269 Rollandia (1930 SH)". Minor Planet Center. Retrieved 29 October 2019.
    4. 1 2 3 4 5 6 7 "LCDB Data for (1269) Rollandia". Asteroid Lightcurve Database (LCDB). Retrieved 10 November 2017.
    5. 1 2 "Asteroid 1269 Rollandia – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 29 October 2019.
    6. 1 2 3 Grav, T.; Mainzer, A. K.; Bauer, J.; Masiero, J.; Spahr, T.; McMillan, R. S.; et al. (January 2012). "WISE/NEOWISE Observations of the Hilda Population: Preliminary Results". The Astrophysical Journal. 744 (2): 15. arXiv:1110.0283. Bibcode:2012ApJ...744..197G. doi:10.1088/0004-637X/744/2/197. S2CID 44000310. Retrieved 10 November 2017.
    7. 1 2 3 4 5 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.
    8. 1 2 3 4 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. (online, AcuA catalog p. 153)
    9. ↑ Warner, Brian D.; Stephens, Robert D.; Coley, Daniel A. (January 2017). "Lightcurve Analysis of Hilda Asteroids at the Center for Solar System Studies: 2016 June-September". The Minor Planet Bulletin. 44 (1): 36–41. Bibcode:2017MPBu...44...36W. ISSN 1052-8091. PMC 7243970. PMID 32455390.
    10. ↑ Fauvaud, Stephane; Fauvaud, Marcel (October 2013). "Photometry of Minor Planets. I. Rotation Periods from Lightcurve Analysis for Seven Main-belt Asteroids". The Minor Planet Bulletin. 40 (4): 224–229. Bibcode:2013MPBu...40..224F. ISSN 1052-8091. Retrieved 10 November 2017.
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