942 Romilda

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942 Romilda
Discovery  [1]
Discovered by K. Reinmuth
Discovery site Heidelberg Obs.
Discovery date11 October 1920
Designations
(942) Romilda
Named after
Name picked from the almanac
Lahrer Hinkender Bote   [2]
A920 TG ·1920 HW
main-belt   [1] [3]  ·(outer)
background   [4] [5]
Orbital characteristics   [3]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc 98.58 yr (36,006 d)
Aphelion 3.6988 AU
Perihelion 2.6321 AU
3.1655 AU
Eccentricity 0.1685
5.63 yr (2,057 d)
258.14°
0° 10m 30s / day
Inclination 10.560°
71.342°
319.36°
Physical characteristics
Mean diameter
  • 35.97±1.75  km [6]
  • 36.772±0.196 km [7]
6.965±0.003  h [8] [9]
  • 0.108±0.012 [6]
  • 0.121±0.026 [7]
C (assumed) [8]
11.0 [1] [3]

    942 Romilda ( prov. designation:A920 TGor1920 HW) is a background asteroid, approximately 36 kilometers (22 miles) in diameter, located in the outer region of the asteroid belt. It was discovered by German astronomer Karl Reinmuth at the Heidelberg Observatory on 11 October 1920. [1] The assumed C-type asteroid has a rotation period of 6.97 hours. It was named "Romilda", a common German female name unrelated to the discoverer's contemporaries, that was taken from the almanac Lahrer Hinkender Bote . [2]

    Contents

    Orbit and classification

    Romilda is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements. [4] [5] It orbits the Sun in the outer asteroid belt at a distance of 2.6–3.7  AU once every 5 years and 8 months (2,057 days; semi-major axis of 3.17 AU). Its orbit has an eccentricity of 0.17 and an inclination of 11° with respect to the ecliptic. [3]

    Discovery

    On 11 October 1920, Romilda was discovered by Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany. [1] On the same night, German astronomer Arnold Schwassmann independently discovered the asteroid at the Bergedorf Observatory in Hamburg. [2] However, the Minor Planet Center only credits Reinmuth as official discoverer. The body's observation arc begins at Heidelberg Observatory on 21 October 1920, the night after its official discovery observation. [1]

    Naming

    This minor planet was named "Romilda", after a female name picked from the Lahrer Hinkender Bote , [10] published in Lahr, southern Germany. [2] A Hinkender Bote (lit. "limping messenger") was a very popular almanac, especially in the alemannic-speaking region from the late 17th throughout the early 20th century. The calendar section contains feast and name days, the dates of important fairs and astronomical ephemerides. For 25 March, the calendar gives "Romilda" as the German analogue next to the catholic and protestant feast days ( The Annunciation to the Blessed Virgin Mary ; German: Mariä Verkündigung). [11]

    Reinmuth's calendar names

    As with 22 other asteroids – starting with 913 Otila, and ending with 1144 Oda – Reinmuth selected names from this calendar due to his many asteroid discoveries that he had trouble thinking of proper names. These names are not related to the discoverer's contemporaries. Lutz Schmadel, the author of the Dictionary of Minor Planet Names learned about Reinmuth's source of inspiration from private communications with Dutch astronomer Ingrid van Houten-Groeneveld, who worked as a young astronomer at Heidelberg. [2]

    Physical characteristics

    Romilda is an assumed carbonaceous C-type asteroid. [8]

    Rotation period

    In December 2005, a rotational lightcurve of Romilda was obtained from photometric observations over seven nights by Walter Cooney at the Blackberry Observatory ( 929 ) in Louisiana. Lightcurve analysis gave a rotation period of 6.965±0.003 hours with a brightness variation of 0.35±0.05 magnitude ( U=3 ). [9] In January 2006, Italian astronomers Roberto Crippa and Federico Manzini at the Sozzago Astronomical Station ( A12 ) determined a nearly identical period of 6.9659±0.0004 hours with an amplitude of 0.26±0.01 magnitude ( U=2 ). [12]

    Diameter and albedo

    According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), Romilda measures (35.97±1.75) and (36.772±0.196) kilometers in diameter, and its surface has an albedo of (0.108±0.012) and (0.121±0.026), respectively. [6] [7] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 35.12 km based on an absolute magnitude of 11. [8] Further published mean-diameters and albedos by the WISE team include (29.756±8.321 km), (33.86±7.45 km), (37.12±0.27 km), and (40.832±0.392 km) with corresponding albedos of (0.0521±0.0541), (0.06±0.03), (0.056±0.006), and (0.0804±0.0074). [5] [8]

    Related Research Articles

    913 Otila is a bright Flora asteroid from the inner regions of the asteroid belt. It was discovered by German astronomer Karl Reinmuth at the Heidelberg Observatory on 19 May 1919. The stony S-type asteroid has a short rotation period of 4.9 hours and measures approximately 12 kilometers in diameter. It was named after 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">918 Itha</span> Main-belt asteroid

    918 Itha is a stony asteroid and the namesake as well as the principal body of the Itha family, located in the outer region of the asteroid belt. It was discovered by German astronomer Karl Reinmuth at the Heidelberg Observatory on 22 August 1919. The S-type asteroid has a notably short rotation period of only 3.5 hours and measures approximately 21 kilometers in diameter. It was named "Itha", a female name taken from the almanac Lahrer Hinkender Bote, unrelated to the discoverer's contemporaries.

    <span class="mw-page-title-main">920 Rogeria</span>

    920 Rogeria is a dark background asteroid from the central region of the asteroid belt, discovered by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory on 1 September 1919. The D-type asteroid (DT) has a rotation period of 12.2 hours and measures approximately 26 kilometers in diameter. It was named "Rogeria", a name unrelated to the discoverer's contemporaries, that was taken from the almanac Lahrer Hinkender Bote.

    921 Jovita is a dark background asteroid, approximately 58 kilometers in diameter, located in the outer regions of the asteroid belt. It was discovered on 4 September 1919, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany. The carbonaceous C-type asteroid (Ch) has a rotation period of 15.6 hours and is likely spherical in shape. It was named "Jovita", a common German female name unrelated to the discoverer's contemporaries, that was taken from the almanac Lahrer Hinkender Bote.

    923 Herluga is a three-body resonant background asteroid, approximately 34 kilometers in diameter, located in the central region of the asteroid belt. It was discovered on 30 September 1919, by astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany. The carbonaceous C-type asteroid has a rotation period of 19.7 hours. It was named "Herluga", a common German female name unrelated to the discoverer's contemporaries, that was taken from the almanac Lahrer Hinkender Bote.

    924 Toni is a large background asteroid, approximately 80 kilometers in diameter, from the outer regions of the asteroid belt. It was discovered on 20 October 1919, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory. The X-type asteroid has a rotation period of 19.4 hours. It was named "Toni", a common German female name unrelated to the discoverer's contemporaries, that was taken from the almanac Lahrer Hinkender Bote.

    926 Imhilde is a dark asteroid and the principal body and namesake of the Imhilde family, located in the outer regions of the asteroid belt. It was discovered by astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany on 15 February 1920. The carbonaceous C-type asteroid has a rotation period of 26.8 hours and measures approximately 48 kilometers in diameter. It was named "Imhilde", 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">928 Hildrun</span>

    928 Hildrun, is a dark background asteroid, approximately 64 kilometers in diameter, located in the outer region of the asteroid belt. It was discovered on 23 February 1920, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany. The X-type asteroid has a rotation period of 14.1 hours. It was named "Hildrun", a common German female name unrelated to the discoverer's contemporaries, that was taken from the almanac Lahrer Hinkender Bote.

    929 Algunde, is a stony Flora asteroid from the inner regions of the asteroid belt, that measures approximately 11 kilometers in diameter. It was discovered by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory on 10 March 1920. The S-type asteroid has a short rotation period of 3.3 hours and is likely spherical in shape. It was named "Algunde", a common German female name unrelated to the discoverer's contemporaries, that was taken from the almanac Lahrer Hinkender Bote.

    931 Whittemora is a metallic background asteroid, approximately 46 kilometers in diameter, located in the outer region of the asteroid belt. It was discovered by French astronomer François Gonnessiat at the Algiers Observatory in North Africa on 19 March 1920. The M-type asteroid has a rotation period of 19.2 hours. It was named after American archaeologist Thomas Whittemore (1871–1950).

    <span class="mw-page-title-main">936 Kunigunde</span>

    936 Kunigunde is a dark Themistian asteroid from the outer regions of the asteroid belt, approximately 40 kilometers in diameter. It was discovered on 8 September 1920, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory. The carbonaceous B-type asteroid has a rotation period of 9.4 hours. It was named "Kunigunde", a common German female name unrelated to the discoverer's contemporaries, that was taken from the almanac Lahrer Hinkender Bote.

    938 Chlosinde is a carbonaceous Themistian asteroid, approximately 33 kilometers in diameter, from the outer regions of the asteroid belt. It was discovered by astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany on 9 September 1920. The C-type asteroid has an ambiguous rotation period of 13.7 or 19.2 hours. It was named "Chlosinde", a common German female name unrelated to the discoverer's contemporaries, that was taken from the almanac Lahrer Hinkender Bote.

    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.

    948 Jucunda is a background asteroid, approximately 17 kilometers in diameter, located in the outer region of the asteroid belt. It was discovered on 3 March 1921, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany. The asteroid has a longer-than average rotation period of 26.2 hours. It was named after a common German female name, unrelated to the discoverer's contemporaries, that was taken from the almanac Lahrer Hinkender Bote.

    959 Arne is a background asteroid and slow rotator, approximately 52 kilometers in diameter, located in the outer region of the asteroid belt. It was discovered by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory on 30 September 1921. The X-type asteroid has an exceptionally long rotation period of 123.7 hours. It was named after Arne Asplind, son of Swedish astronomer Bror Asplind (1890–1954).

    <span class="mw-page-title-main">983 Gunila</span> Main-belt asteroid

    983 Gunila, is a dark background asteroid from the outer regions of the asteroid belt, approximately 74 kilometers in diameter. It was discovered on 30 July 1922, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in Germany. The X-type asteroid has an ambiguous rotation period of 8.3 or 16.6 hours. It was named "Gunila", a common German female name unrelated to the discoverer's contemporaries, that was taken from the almanac Lahrer Hinkender Bote.

    987 Wallia is a large background asteroid from the outer regions of the asteroid belt, approximately 52 kilometers in diameter. It was discovered on 23 October 1922, by astronomer Karl Reinmuth at the Heidelberg Observatory in southern Germany. The D/T-type asteroid has a rotation period of 10.1 hours and shows an unusual trinomial lightcurve. It was named after a common German female name, unrelated to the discoverer's contemporaries, and taken from the almanac Lahrer Hinkender Bote.

    <span class="mw-page-title-main">994 Otthild</span>

    994 Otthild is a stony background asteroid from the central regions of the asteroid belt, approximately 24 kilometers in diameter. It was discovered on 18 March 1923, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory. The S-type asteroid has a rotation period of 5.95 hours and is rather regular in shape. It was named after a common German female name, unrelated to the discoverer's contemporaries, and taken from the almanac Lahrer Hinkender Bote.

    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.

    <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.

    References

    1. 1 2 3 4 5 6 "942 Romilda (A920 TG)". Minor Planet Center. Retrieved 16 February 2020.
    2. 1 2 3 4 5 Schmadel, Lutz D. (2007). "(942) Romilda". Dictionary of Minor Planet Names . Springer Berlin Heidelberg. p.  83. doi:10.1007/978-3-540-29925-7_943. ISBN   978-3-540-00238-3.
    3. 1 2 3 4 "JPL Small-Body Database Browser: 942 Romilda (A920 TG)" (2019-05-11 last obs.). Jet Propulsion Laboratory . Retrieved 16 February 2020.
    4. 1 2 "Asteroid 942 Romilda – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 16 February 2020.
    5. 1 2 3 "Asteroid 942 Romilda". Small Bodies Data Ferret. Retrieved 16 February 2020.
    6. 1 2 3 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)
    7. 1 2 3 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.
    8. 1 2 3 4 5 "LCDB Data for (942) Romilda". Asteroid Lightcurve Database (LCDB). Retrieved 16 February 2020.
    9. 1 2 Cooney, Walter R. Jr.; Gross, John; Terrell, Dirk; Reddy, Vishnu; Dyvig, Ron (June 2007). "Lightcurve Results for 486 Cremona, 855 Newcombia 942 Romilda, 3908 Nyx, 5139 Rumoi, 5653 Camarillo, (102866) 1999 WA5" (PDF). The Minor Planet Bulletin. 34 (2): 47–49. Bibcode:2007MPBu...34...47C.
    10. ↑ "Lahrer hinkender Bote – Kalender 1925". Badischen Landesbibliothek. 1925. p. 1. Retrieved 10 February 2020. Lahrer Bote archive
    11. ↑ "Lahrer hinkender Bote – Kalender 1925". Badischen Landesbibliothek. 1925. p. 6. Retrieved 10 February 2020.
    12. ↑ Behrend, Raoul. "Asteroids and comets rotation curves – (942) Romilda". Geneva Observatory. Retrieved 16 February 2020.
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