948 Jucunda

948 Jucunda (provisional designation: A921 EL or 1921 JE) is a background asteroid, approximately 17 kilometers (11 miles) 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.[1] 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.[2]

948 Jucunda
Discovery [1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date3 March 1921
Designations
(948) Jucunda
Named after
Name picked from the almanac
Lahrer Hinkender Bote [2]
A921 EL · 1921 JE
main-belt [1][3] · (outer)
background [4][5]
Orbital characteristics [3]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc98.85 yr (36,104 d)
Aphelion3.5276 AU
Perihelion2.5362 AU
3.0319 AU
Eccentricity0.1635
5.28 yr (1,928 d)
277.84°
0° 11m 12.12s / day
Inclination8.6536°
357.10°
163.29°
Physical characteristics
Mean diameter
26.24±0.01 h[8][9]
  • 0.170±0.022[7]
  • 0.196±0.037[6]
C (assumed)[8]
11.5[1][3]

    Orbit and classification

    Jucunda 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 2.5–3.5 AU once every 5 years and 3 months (1,928 days; semi-major axis of 3.03 AU). Its orbit has an eccentricity of 0.16 and an inclination of 9° with respect to the ecliptic.[3] The body's observation arc begins at Heidelberg/Vienna Observatory on 10 March 1921, one week after its official discovery observation.[1]

    Naming

    This minor planet was named "Jucunda", after a female name picked from the Lahrer Hinkender Bote, published in Lahr, southern Germany. 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 days, the dates of important fairs and astronomical ephemerides. The calendar contains a German name day analogue for the respective catholic and protestant feast-days (entry not found).[10] The name derives from iucundus, Latin for "pleasant" or "agreeable".

    Reinmuth's calendar names

    As with 913 Otila, 994 Otthild, 997 Priska and 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

    Jucunda is an assumed carbonaceous C-type asteroid.[8] However, most published albedos are between 0.13 and 0.19, too high to agree with a carbonaceous spectral type (see below).

    Rotation period

    In April 2011, a rotational lightcurve of Jucunda was obtained from photometric observations by Robert Stephens at the Santana Observatory (646) and Goat Mountain Astronomical Research Station (G79) in California. Lightcurve analysis gave a rotation period of 26.24±0.01 hours with a brightness amplitude of 0.30±0.03 magnitude (U=3).[9] Observations in March 2011, by Luca Strabla, Ulisse Quadri and Roberto Girelli at Bassano Bresciano Observatory (565) gave a period of 28.639±0.012 hours with an amplitude of 0.35±0.05 magnitude (U=2+).[11] Additional period determinations of 27.6 h (1.150 d) and 27.9 h (1.16220 d) were made by Eric Barbotin and Raoul Behrend in November 2019, and by Pierre Antonini in March 2011 (U=n.a.).[12]

    Diameter and albedo

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE) and the Japanese Akari satellite, Jucunda measures 17.331±0.194 and 17.77±1.08 kilometers in diameter and its surface has an albedo of 0.196±0.037 and 0.170±0.022, respectively.[6][7] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 27.90 kilometers based on an absolute magnitude of 11.5.[8] Additional measurements were published by the WISE team (all of them have larger diameters with lower albedos). They are: 18.116±0.134 km (2011), 19.38±0.23 km (2012) and 20.00±5.78 km (2016) with the corresponding albedos of 0.1635±0.0282, 0.130±0.015 and 0.09±0.07, respectively.[5][8]

    References
    1. "948 Jucunda (A921 EL)". Minor Planet Center. Retrieved 14 February 2020.
    2. Schmadel, Lutz D. (2007). "(948) Jucunda". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 83. doi:10.1007/978-3-540-29925-7_949. ISBN 978-3-540-00238-3.
    3. "JPL Small-Body Database Browser: 948 Jucunda (A921 EL)" (2020-01-07 last obs.). Jet Propulsion Laboratory. Retrieved 14 February 2020.
    4. "Asteroid 948 Jucunda – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 14 February 2020.
    5. "Asteroid 948 Jucunda". Small Bodies Data Ferret. Retrieved 14 February 2020.
    6. 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.
    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 14 February 2020. (online, AcuA catalog p. 153)
    8. "LCDB Data for (948) Jucunda". Asteroid Lightcurve Database (LCDB). Retrieved 14 February 2020.
    9. Stephens, Robert D. (October 2011). "Asteroids Observed from GMARS and Sanana Observatories: 2011 April - June" (PDF). The Minor Planet Bulletin. 38 (4): 211–212. Bibcode:2011MPBu...38..211S.
    10. "Lahrer hinkender Bote – Kalender 1925". Badischen Landesbibliothek. 1925. Retrieved 14 February 2020. Lahrer Bote archive
    11. Strabla, Luca; Quadri, Ulisse; Girelli, Roberto (July 2011). "Minor Planet Lightcurve Analysis at Bassano Bresciano Observatory: 2010 October - 2011 March" (PDF). The Minor Planet Bulletin. 38 (3): 169–172. Bibcode:2011MPBu...38..169S.
    12. Behrend, Raoul. "Asteroids and comets rotation curves – (948) Jucunda". Geneva Observatory. Retrieved 14 February 2020.
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