IOTA/IOTA-ES occultation update for (879) Ricarda / UCAC4 338-069631 event on 2024 Dec 11, 01:40 UT Visible from Summary ------- On 2024 Dec 11 UT, the 17.924 km diameter asteroid (879) Ricarda will occult a 11.4 mag star in the constellation Virgo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.52 mag to 16.87 mag (the magnitude of the asteroid) for at most 0.490 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 99 * date and approx. time of event: 2024 Dec 11, 01:37 - 2024 Dec 11, 01:43 * geocentric midpoint of event [JD]: 2460655.57006159 * magnitude of target star: 11.36 * magnitude drop [mag]: 5.52 * estimated maximum duration [s]: 0.490 * Moon: 76 % sunlit, 165° distance * Sun: 47° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 18 * 1 sigma uncertainty interval [path widths]: +/- 0.27 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.010", 0.001", 106°) * approx speed of asteroid's shadow [km/s]: 36.3091 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 338-069631 by 879 Ricarda on 2024 Dec 11 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude 20 0 0 18 11 32 1 37 58.2 0 114 -47 18 6 11 18 16 52 18 3 18 18 19 46 .... 21 0 0 17 45 46 1 37 58.3 1 114 -46 17 40 25 17 51 7 17 37 30 17 54 2 0.17 22 0 0 17 19 28 1 37 58.3 2 115 -45 17 14 5 17 24 50 17 11 10 17 27 45 0.13 23 0 0 16 52 37 1 37 58.5 3 115 -44 16 47 13 16 58 0 16 44 18 17 0 55 0.12 24 0 0 16 25 13 1 37 58.7 4 115 -42 16 19 49 16 30 37 16 16 53 16 33 33 0.11 25 0 0 15 57 17 1 37 59.0 5 115 -41 15 51 52 16 2 43 15 48 55 16 5 39 0.11 26 0 0 15 28 50 1 37 59.3 6 116 -40 15 23 23 15 34 16 15 20 26 15 37 13 0.11 27 0 0 14 59 50 1 37 59.7 8 116 -39 14 54 23 15 5 18 14 51 25 15 8 15 0.10 28 0 0 14 30 19 1 38 0.2 9 116 -38 14 24 51 14 35 48 14 21 52 14 38 46 0.10 29 0 0 14 0 18 1 38 0.7 10 116 -37 13 54 48 14 5 47 13 51 49 14 8 46 0.10 30 0 0 13 29 45 1 38 1.3 11 117 -36 13 24 14 13 35 16 13 21 15 13 38 15 0.10 31 0 0 12 58 42 1 38 2.0 12 117 -35 12 53 11 13 4 14 12 50 10 13 7 14 0.10 32 0 0 12 27 10 1 38 2.7 13 117 -34 12 21 37 12 32 42 12 18 36 12 35 43 0.10 33 0 0 11 55 8 1 38 3.5 14 117 -33 11 49 34 12 0 41 11 46 33 12 3 42 0.10 34 0 0 11 22 37 1 38 4.4 15 118 -32 11 17 2 11 28 12 11 14 1 11 31 13 0.10 35 0 0 10 49 38 1 38 5.3 16 118 -31 10 44 2 10 55 14 10 41 0 10 58 16 0.10 36 0 0 10 16 12 1 38 6.4 18 118 -29 10 10 35 10 21 48 10 7 32 10 24 51 0.10 37 0 0 9 42 18 1 38 7.4 19 118 -28 9 36 40 9 47 56 9 33 37 9 50 59 0.10 38 0 0 9 7 58 1 38 8.6 20 118 -27 9 2 20 9 13 37 8 59 16 9 16 40 0.10 39 0 0 8 33 13 1 38 9.8 21 118 -26 8 27 33 8 38 52 8 24 29 8 41 57 0.10 40 0 0 7 58 3 1 38 11.1 22 118 -25 7 52 23 8 3 43 7 49 18 8 6 48 0.10 41 0 0 7 22 29 1 38 12.5 23 119 -24 7 16 48 7 28 10 7 13 42 7 31 15 0.10 42 0 0 6 46 32 1 38 13.9 24 119 -23 6 40 50 6 52 14 6 37 44 6 55 19 0.10 43 0 0 6 10 13 1 38 15.5 26 119 -21 6 4 30 6 15 55 6 1 24 6 19 1 0.10 44 0 0 5 33 32 1 38 17.0 27 119 -20 5 27 48 5 39 16 5 24 42 5 42 22 0.10 45 0 0 4 56 32 1 38 18.7 28 119 -19 4 50 47 5 2 16 4 47 40 5 5 23 0.10 46 0 0 4 19 12 1 38 20.4 29 119 -18 4 13 27 4 24 57 4 10 19 4 28 4 0.10 47 0 0 3 41 34 1 38 22.2 30 119 -17 3 35 48 3 47 20 3 32 40 3 50 27 0.10 48 0 0 3 3 39 1 38 24.1 31 119 -16 2 57 52 3 9 25 2 54 44 3 12 33 0.10 49 0 0 2 25 28 1 38 26.1 33 119 -14 2 19 41 2 31 15 2 16 33 2 34 23 0.10 50 0 0 1 47 3 1 38 28.1 34 119 -13 1 41 15 1 52 50 1 38 6 1 55 59 0.10 51 0 0 1 8 24 1 38 30.1 35 119 -12 1 2 35 1 14 12 0 59 26 1 17 21 0.09 52 0 0 0 29 32 1 38 32.3 36 119 -11 0 23 44 0 35 21 0 20 35 0 38 30 0.09 53 0 0 - 0 9 30 1 38 34.5 37 119 -10 - 0 15 19 - 0 3 41 - 0 18 28 - 0 0 31 0.09 54 0 0 - 0 48 41 1 38 36.8 39 119 -9 - 0 54 31 - 0 42 52 - 0 57 41 - 0 39 42 0.09 55 0 0 - 1 28 1 1 38 39.1 40 119 -7 - 1 33 51 - 1 22 12 - 1 37 1 - 1 19 2 0.09 56 0 0 - 2 7 28 1 38 41.5 41 119 -6 - 2 13 19 - 2 1 38 - 2 16 29 - 1 58 28 0.09 57 0 0 - 2 47 1 1 38 44.0 42 119 -5 - 2 52 52 - 2 41 11 - 2 56 2 - 2 38 0 0.09 58 0 0 - 3 26 38 1 38 46.5 43 118 -4 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-30 51 24 -30 35 11 0.11 -165 0 0 -30 21 57 1 43 46.5 8 248 51 -30 27 14 -30 16 41 -30 30 6 -30 13 49 0.11 -164 0 0 -30 0 5 1 43 46.8 7 248 51 -30 5 23 -29 54 48 -30 8 15 -29 51 56 0.12 -163 0 0 -29 37 42 1 43 47.2 6 247 50 -29 43 0 -29 32 24 -29 45 53 -29 29 31 0.12 -162 0 0 -29 14 47 1 43 47.4 5 247 49 -29 20 6 -29 9 27 -29 23 0 -29 6 34 0.13 -161 0 0 -28 51 20 1 43 47.7 4 246 48 -28 56 41 -28 46 0 -28 59 35 -28 43 6 0.14 -160 0 0 -28 27 22 1 43 47.8 3 246 47 -28 32 43 -28 22 0 -28 35 38 -28 19 6 0.15 -159 0 0 -28 2 52 1 43 48.0 2 245 46 -28 8 14 -27 57 29 -28 11 10 -27 54 34 0.19 -158 0 0 -27 37 51 1 43 48.0 1 245 45 -27 43 14 -27 32 27 -27 46 10 -27 29 32 0.30 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 338-069631 * constellation : Virgo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 13 45 50.3308 DE: -22 32 47.479 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 13 45 50.3308 DE: -22 32 47.479 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.4 * B mag [mag]: 12.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (879) Ricarda asteroid class: approx. diameter [km]: 18 approx. diameter ["]: 0.007 distance from Earth [AU]: 3.48720 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#56 date of fit: 2023 Apr 27 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.010", 0.001", 105.693° remarks: * orbital elements for (879)Ricarda : Mean anomaly = 195.0124313896 deg Arg. of pericenter = 96.6770172430 deg Long. of node = 269.7862729438 deg Inclination = 13.6816266350 deg Eccentricity = 0.1549257303 Semimajor axis = 2.5312116656 AU Perihelion dist = 2.1390618498 AU Mag: H = 11.02, G = 0.15 Epoch of elements : MJD 60655.07006150 TDT (2024 Dec 11.0701) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#562023Apr27,0.49,2024,12,11,1.681478,-0.035062,-0.078497,18.628888,-8.541781,-0.004324,0.000854,-0.000001,0.000001 101.3084,-22.6694,153.10,-23.02,False UCAC4 338-069631,13.76398071,-22.5465217,12.01,11.36,11.01,0.0,0,,13.78668228,-22.6694162,5.51,5.42,0,0,0 879,Ricarda,16.87,17.924,3.4872,0,0,3.395,-21.54,,1.0,0 0,194.7505,2024,12,10,96.6770,269.7863,13.6816,0.15493,2.53121,2.13906,11.02,5.0,0.15 1.271,0.0103,0.0011,106,0.0019,Known errors,1.32,0,-1,-1 20241211_069631,60140.73 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:38 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org