909 Ulla

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909 Ulla
909 Ulla orbit on 01 Jan 2009.png
Orbital diagram of Ulla
Discovery  [1]
Discovered by K. Reinmuth
Discovery site Heidelberg Obs.
Discovery date7 February 1919
Designations
(909) Ulla
PronunciationGerman: [ˈʊlaː] [2]
Classically: /ˈʌlə/ [3]
Named after
Ulla Ahrens  [4]
(observatory donor)
1919 FA ·1936 SJ
1949 OF1 ·1949 PW
1966 BU ·1966 DM
A912 CA ·A919 CA
main-belt  ·(outer)  [5]
Ulla  · Cybele
Orbital characteristics   [6]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc 100.99 yr (36,886 d)
Aphelion 3.8633 AU
Perihelion 3.2217 AU
3.5425 AU
Eccentricity 0.0906
6.67 yr (2,435 d)
180.34°
0° 8m 52.08s / day
Inclination 18.797°
146.35°
232.64°
TJupiter 3.0250
Physical characteristics
  • 113.13±1.48  km [7]
  • 116.44±2.4 km [8]
8.73  h [9]
  • 0.0343±0.001 [8]
  • 0.037±0.001 [7]
8.95 [1] [6] [7] [8]

    909 Ulla is a large and dark asteroid from the outermost regions of the asteroid belt, that measures approximately 116 kilometers (72 miles) in diameter. It is the parent body and namesake of the Ulla family, which belongs to the larger group of Cybele asteroids. It was discovered on 7 February 1919, by German astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany. [1] The X-type asteroid has a rotation period of 8.7 hours and a notably low value for its Jupiter Tisserand's parameter. It was named after Ulla Ahrens, daughter of a friend of the discoverer. [4]

    Contents

    Orbit and classification

    Ulla is the parent body of the Ulla family ( 903 ), [11] a very small asteroid family of less than 30 known bodies. [12] It orbits the Sun in the outermost asteroid belt at a distance of 3.2–3.9  AU once every 6 years and 8 months (2,435 days; semi-major axis of 3.54 AU). Its orbit has an eccentricity of 0.09 and an inclination of 19° with respect to the ecliptic. [6]

    Naming

    This minor planet was named after Ulla Ahrens, a daughter of a friend of the discoverer. [4] Karl Reinmuth also named the asteroid 950 Ahrensa for the Ahrens family, who was a donor of the Heidelberg Observatory. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 ( H 50 ). [4]

    Physical characteristics

    In the SMASS classification, Ulla is an X-type asteroid. [6] [10]

    Rotation period

    A rotational lightcurve of Ulla was obtained from photometric observations in 2000. Lightcurve analysis gave a rotation period of 8.73 hours with a brightness amplitude between 0.13 and 0.24 magnitude ( U=3 ). [9] Other photometric period determinations gave concurring results. [13] [14]

    Diameter and albedo

    According to the surveys carried out by the Infrared Astronomical Satellite IRAS and the Japanese Akari satellite, Ulla measures 113.13±1.48 and 116.44±2.4 kilometers in diameter and its surface has an albedo between 0.0343±0.001 and 0.037±0.001. [7] [8] The Collaborative Asteroid Lightcurve Link uses an albedo of 0.0450 and derives a diameter of 116.66 kilometers based on an absolute magnitude of 8.65. [5]

    Related Research Articles

    940 Kordula is a large and dark Cybele asteroid from the outermost region of the asteroid belt, approximately 80 kilometers in diameter. It was discovered on 10 October 1920, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in Germany. The carbonaceous F-type asteroid (FC) has a rotation period of 15.6 hours. It was named "Kordula", a common German female name unrelated to the discoverer's contemporaries, that was taken from the almanac Lahrer Hinkender Bote.

    <span class="mw-page-title-main">950 Ahrensa</span> Phocaea asteroid and slow rotator

    950 Ahrensa, provisional designation 1921 JP, is a stony Phocaea asteroid and slow rotator from the inner regions of the asteroid belt, approximately 15 kilometers in diameter. It was discovered on 1 April 1921, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany.

    997 Priska, provisional designation 1923 NR, is a carbonaceous Adeonian asteroid from the central regions of the asteroid belt, approximately 19 kilometers in diameter. It was discovered on 12 July 1923, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany. The asteroid's name is a common German female name, unrelated to the discoverer's contemporaries.

    Belopolskya, provisional designation 1923 OS, is a dark Cybele asteroid from the outermost region of the asteroid belt, approximately 75 kilometers (47 mi) in diameter. It was named for Russian astrophysicist Aristarkh Belopolsky.

    <span class="mw-page-title-main">1087 Arabis</span>

    1087 Arabis is a stony Eoan asteroid from the outer regions of the asteroid belt, approximately 35 kilometers in diameter. It was discovered by Karl Reinmuth at the Heidelberg Observatory in 1927 and assigned the provisional designation 1927 RD. The asteroid was named after the flowering plant Arabis (rockcress).

    1101 Clematis is an Alauda asteroid from the outermost regions of the asteroid belt, approximately 37 kilometers in diameter. It was discovered on 22 September 1928, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany, and assigned the provisional designation 1928 SJ. It was named for the flowering plant Clematis. The presumably carbonaceous asteroid has a relatively long rotation period of 34.3 hours.

    1109 Tata, provisional designation 1929 CU, is a dark Hygiean asteroid from the outer regions of the asteroid belt, approximately 69 kilometers in diameter. It was discovered on 5 February 1929, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in Germany. The meaning of the asteroids's name is unknown.

    1115 Sabauda is a carbonaceous Meliboean asteroid from the outer region of the asteroid belt, approximately 68 kilometers in diameter. Discovered in 1928 by Italian astronomer Luigi Volta, it was assigned the provisional designation 1928 XC. The asteroid was probably named after the House of Savoy, the former rulers of Italy.

    1144 Oda, provisional designation 1930 BJ, is a dark Hildian asteroid from the outermost regions of the asteroid belt, approximately 57 kilometers in diameter. It was discovered on 28 January 1930, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory. The asteroid's name is a German female name, not related to the discoverer's contemporaries.

    <span class="mw-page-title-main">1404 Ajax</span> Asteroid

    1404 Ajax is a carbonaceous Jupiter trojan from the Greek camp, approximately 83 kilometers kilometers in diameter. It was discovered on 17 August 1936, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany, and named after the legendary warrior Ajax from Greek mythology. The assumed C-type asteroid belongs to the 40 largest Jupiter trojans and has a longer than average rotation period of 29.4 hours.

    3141 Buchar, provisional designation 1984 RH, is a dark Cybele asteroid from the outermost region of the asteroid belt, approximately 36 kilometers in diameter. It was discovered on 2 September 1984, by Czech astronomer Antonín Mrkos at the Kleť Observatory. The D-type asteroid has a rotation period of 11.4 hours. It was named in memory of Czechoslovakian astronomer Emil Buchar.

    <span class="mw-page-title-main">1275 Cimbria</span>

    1275 Cimbria is a Eunomia asteroid from the central regions of the asteroid belt, approximately 27 kilometers in diameter. It was discovered on 30 November 1932, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southern Germany. The asteroid was named after the Cimbri, an ancient Germanic tribe.

    1234 Elyna, provisional designation 1931 UF, is an Eoan asteroid from the outer regions of the asteroid belt, approximately 25 kilometers in diameter. It was discovered on 18 October 1931, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory. The asteroid was named after the flowering plant Elyna.

    1308 Halleria, provisional designation 1931 EB, is a carbonaceous Charis asteroid from the outer regions of the asteroid belt, approximately 43 kilometers in diameter. It was discovered on 12 March 1931, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory. The asteroid was named after Albrecht von Haller a Swiss physician, botanist and poet.

    1370 Hella, provisional designation 1935 QG, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 5.4 kilometers in diameter. It was discovered on 31 August 1935, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany. The asteroid was named for Helene Nowacki, an astronomer at the Astronomical Calculation Institute.

    1174 Marmara, provisional designation 1930 UC, is a stony Eoan asteroid from the outer regions of the asteroid belt, approximately 17 kilometers in diameter. It was discovered on 17 October 1930, by German astronomer Karl Reinmuth at Heidelberg Observatory in southwest Germany. The asteroid was later named after the Sea of Marmara, located between Europe and Asia.

    <span class="mw-page-title-main">1256 Normannia</span> Hilda asteroid and slow rotator

    1256 Normannia is a dark Hilda asteroid and slow rotator from the outermost regions of the asteroid belt, approximately 69 kilometers in diameter. It was discovered on 8 August 1932, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in Germany. The asteroid was likely named after the Normans who gave their name to the region of Normandy in France.

    <span class="mw-page-title-main">1249 Rutherfordia</span> Asteroid

    1249 Rutherfordia, provisional designation 1932 VB, is an elongated, stony Florian asteroid from the inner regions of the asteroid belt, approximately 13 kilometers in diameter. Discovered by Karl Reinmuth at Heidelberg Observatory in 1932, the asteroid was named after Rutherford, New Jersey a suburb of New York City, United States.

    2443 Tomeileen, provisional designation A906 BJ, is a stony Eoan asteroid from the outer regions of the asteroid belt, approximately 32 kilometers in diameter. It was discovered on 24 January 1906, by German astronomer Max Wolf at the Heidelberg-Königstuhl State Observatory in Heidelberg, Germany. The S-type asteroid was named after the parents of British astronomer Brian G. Marsden. It has a rotation period of 3.97 hours.

    1481 Tübingia, provisional designation 1938 DR, is a dark asteroid from the outer region of the asteroid belt, approximately 34 kilometers in diameter. It was discovered on 7 February 1938, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany, and named for the German city of Tübingen.

    References

    1. 1 2 3 "909 Ulla (1919 FA)". Minor Planet Center. Retrieved 7 July 2018.
    2. ↑ (German Names)
    3. ↑ Noah Webster (1884) A Practical Dictionary of the English Language
    4. 1 2 3 4 Schmadel, Lutz D. (2007). "(909) Ulla". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 81. doi:10.1007/978-3-540-29925-7_910. ISBN   978-3-540-00238-3.
    5. 1 2 3 "LCDB Data for (909) Ulla". Asteroid Lightcurve Database (LCDB). Retrieved 7 July 2018.
    6. 1 2 3 4 5 6 7 "JPL Small-Body Database Browser: 909 Ulla (A919 CA)" (2020-02-04 last obs.). Jet Propulsion Laboratory. Archived from the original on 19 September 2020. Retrieved 24 February 2020.
    7. 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)
    8. 1 2 3 4 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 23 February 2020.
    9. 1 2 Lagerkvist, Claes-Ingvar; Erikson, Anders; Lahulla, Felix; De Martino, Mario; Nathues, Andreas; Dahlgren, Mats (January 2001). "A Study of Cybele Asteroids. I. Spin Properties of Ten Asteroids". Icarus. 149 (1): 190–197. Bibcode:2001Icar..149..190L. doi:10.1006/icar.2000.6507.
    10. 1 2 De Prá, M. N.; Pinilla-Alonso, N.; Carvano, J. M.; Licandro, J.; Campins, H.; Mothé-Diniz, T.; et al. (September 2018). "PRIMASS visits Hilda and Cybele groups". Icarus. 311: 35–51. arXiv: 1711.02071 . Bibcode:2018Icar..311...35D. doi:10.1016/j.icarus.2017.11.012. S2CID   119383924.
    11. ↑ "Asteroid 909 Ulla". Small Bodies Data Ferret. Retrieved 7 July 2018.
    12. ↑ Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". Asteroids IV. pp. 297–321. arXiv: 1502.01628 . Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN   9780816532131. S2CID   119280014.
    13. ↑ Gonano, M.; di Martino, M.; Mottola, S.; Neukum, G. (December 1990). "Physical study of outer belt asteroids". Space Dust and Debris; Proceedings of the Topical Meeting of the Interdisciplinary Scientific Commission B /Meetings B2. 11 (12): 197–200. Bibcode:1991AdSpR..11l.197G. doi:10.1016/0273-1177(91)90563-Y. ISSN   0273-1177.
    14. ↑ Behrend, Raoul. "Asteroids and comets rotation curves – (909) Ulla". Geneva Observatory . Retrieved 7 July 2018.
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