IOTA/IOTA-ES occultation update for (1197) Rhodesia / UCAC4 522-038493 event on 2022 Dec 14, 17:45 UT Visible from Australia Summary ------- On 2022 Dec 14 UT, the 48.4 km diameter asteroid (1197) Rhodesia will occult a 12.5 mag star in the constellation Gemini for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.76 mag to 14.02 mag (the magnitude of the asteroid) for at most 4.990 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: 78 * date and approx. time of event: 2022 Dec 14, 17:36 - 2022 Dec 14, 17:54 * geocentric midpoint of event [JD]: 2459928.24002125 * magnitude of target star: 12.50 * magnitude drop [mag]: 1.76 * estimated maximum duration [s]: 4.990 * Moon: 65 % sunlit, 48° distance * Sun: 153° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 62 * 1 sigma uncertainty interval [path widths]: +/- 0.70 * 1 sigma uncertainty interval [seconds]: +/- 3.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.036, +/- 0.014) * 1 sigma uncertainty ellipse (major, minor, PA): (0.038", 0.004", 111°) * approx speed of asteroid's shadow [km/s]: 9.7080 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 522-038493 by 1197 Rhodesia on 2022 Dec 14 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 56 0 0 -62 27 3 17 54 9.8 0 58 0 -62 7 17 .. .. .. -61 39 48 .. .. .. .... 57 0 0 -62 9 32 17 54 9.8 1 57 -1 -61 49 40 -62 29 31 -61 22 3 -62 57 39 0.12 58 0 0 -61 51 33 17 54 9.7 1 56 -1 -61 31 35 -62 11 37 -61 3 49 -62 39 54 0.46 59 0 0 -61 33 5 17 54 9.5 2 56 -2 -61 13 1 -61 53 15 -60 45 7 -62 21 40 0.57 60 0 0 -61 14 8 17 54 9.2 2 55 -2 -60 53 58 -61 34 24 -60 25 56 -62 2 58 0.63 61 0 0 -60 54 41 17 54 8.8 3 54 -3 -60 34 26 -61 15 4 -60 6 16 -61 43 46 0.67 62 0 0 -60 34 46 17 54 8.4 3 53 -3 -60 14 24 -60 55 14 -59 46 7 -61 24 5 0.69 63 0 0 -60 14 20 17 54 7.8 4 52 -4 -59 53 53 -60 34 54 -59 25 27 -61 3 53 0.71 64 0 0 -59 53 24 17 54 7.2 5 51 -4 -59 32 51 -60 14 4 -59 4 18 -60 43 11 0.72 65 0 0 -59 31 57 17 54 6.4 5 50 -5 -59 11 19 -59 52 43 -58 42 38 -60 21 59 0.73 66 0 0 -59 10 0 17 54 5.5 6 50 -5 -58 49 17 -59 30 51 -58 20 28 -60 0 15 0.74 67 0 0 -58 47 32 17 54 4.5 7 49 -6 -58 26 43 -59 8 29 -57 57 47 -59 38 0 0.75 68 0 0 -58 24 33 17 54 3.4 7 48 -6 -58 3 39 -58 45 35 -57 34 35 -59 15 14 0.75 69 0 0 -58 1 2 17 54 2.1 8 47 -7 -57 40 3 -58 22 10 -57 10 52 -58 51 57 0.76 70 0 0 -57 37 1 17 54 0.8 8 46 -8 -57 15 56 -57 58 13 -56 46 39 -58 28 7 0.76 71 0 0 -57 12 27 17 53 59.3 9 45 -8 -56 51 18 -57 33 45 -56 21 54 -58 3 46 0.77 72 0 0 -56 47 22 17 53 57.6 10 44 -9 -56 26 8 -57 8 45 -55 56 38 -57 38 53 0.77 73 0 0 -56 21 46 17 53 55.8 11 44 -9 -56 0 27 -56 43 13 -55 30 50 -57 13 28 0.77 74 0 0 -55 55 38 17 53 53.9 11 43 -10 -55 34 15 -56 17 10 -55 4 32 -56 47 32 0.78 75 0 0 -55 28 59 17 53 51.8 12 42 -10 -55 7 31 -55 50 35 -54 37 43 -56 21 3 0.78 76 0 0 -55 1 49 17 53 49.6 13 41 -11 -54 40 17 -55 23 29 -54 10 23 -55 54 2 0.78 77 0 0 -54 34 7 17 53 47.2 13 40 -12 -54 12 32 -54 55 51 -53 42 32 -55 26 30 0.78 78 0 0 -54 5 55 17 53 44.6 14 39 -12 -53 44 16 -54 27 42 -53 14 12 -54 58 27 0.79 79 0 0 -53 37 12 17 53 41.8 15 39 -13 -53 15 30 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0.80 92 0 0 -46 41 33 17 52 48.3 25 28 -20 -46 19 32 -47 3 43 -45 48 57 -47 35 1 0.80 93 0 0 -46 6 45 17 52 42.7 26 27 -21 -45 44 45 -46 28 55 -45 14 11 -47 0 12 0.80 94 0 0 -45 31 38 17 52 36.9 27 26 -21 -45 9 38 -45 53 47 -44 39 6 -46 25 3 0.80 95 0 0 -44 56 13 17 52 30.9 28 25 -22 -44 34 14 -45 18 21 -44 3 43 -45 49 35 0.80 96 0 0 -44 20 30 17 52 24.6 28 24 -22 -43 58 33 -44 42 37 -43 28 4 -45 13 49 0.80 97 0 0 -43 44 32 17 52 18.1 29 23 -23 -43 22 36 -44 6 37 -42 52 10 -44 37 46 0.80 98 0 0 -43 8 19 17 52 11.4 30 22 -23 -42 46 26 -43 30 22 -42 16 2 -44 1 29 0.80 99 0 0 -42 31 53 17 52 4.4 31 21 -24 -42 10 2 -42 53 54 -41 39 41 -43 24 57 0.80 100 0 0 -41 55 15 17 51 57.3 32 20 -24 -41 33 27 -42 17 13 -41 3 9 -42 48 13 0.80 101 0 0 -41 18 27 17 51 49.9 33 19 -25 -40 56 41 -41 40 22 -40 26 27 -42 11 18 0.81 102 0 0 -40 41 29 17 51 42.3 33 18 -25 -40 19 46 -41 3 21 -39 49 36 -41 34 13 0.81 103 0 0 -40 4 24 17 51 34.5 34 17 -26 -39 42 44 -40 26 12 -39 12 38 -40 56 59 0.81 104 0 0 -39 27 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0 0 - 8 3 18 17 37 51.5 19 288 8 - 7 46 32 - 8 20 9 - 7 23 9 - 8 43 51 0.82 -170 0 0 - 8 5 40 17 37 47.0 18 288 8 - 7 48 52 - 8 22 32 - 7 25 29 - 8 46 14 0.82 -169 0 0 - 8 8 41 17 37 42.6 17 288 9 - 7 51 53 - 8 25 33 - 7 28 28 - 8 49 17 0.82 -168 0 0 - 8 12 21 17 37 38.4 16 287 10 - 7 55 32 - 8 29 15 - 7 32 6 - 8 53 0 0.82 -167 0 0 - 8 16 41 17 37 34.5 15 287 11 - 7 59 51 - 8 33 36 - 7 36 23 - 8 57 23 0.82 -166 0 0 - 8 21 41 17 37 30.8 15 287 12 - 8 4 49 - 8 38 37 - 7 41 20 - 9 2 26 0.82 -165 0 0 - 8 27 21 17 37 27.3 14 287 13 - 8 10 27 - 8 44 18 - 7 46 56 - 9 8 9 0.83 -164 0 0 - 8 33 40 17 37 24.1 13 287 14 - 8 16 45 - 8 50 39 - 7 53 12 - 9 14 32 0.83 -163 0 0 - 8 40 39 17 37 21.0 12 287 15 - 8 23 43 - 8 57 40 - 8 0 7 - 9 21 35 0.83 -162 0 0 - 8 48 19 17 37 18.2 11 286 16 - 8 31 21 - 9 5 21 - 8 7 42 - 9 29 19 0.83 -161 0 0 - 8 56 39 17 37 15.7 10 286 17 - 8 39 39 - 9 13 43 - 8 15 58 - 9 37 44 0.84 -160 0 0 - 9 5 39 17 37 13.4 9 286 18 - 8 48 37 - 9 22 45 - 8 24 53 - 9 46 49 0.84 -159 0 0 - 9 15 20 17 37 11.3 8 286 19 - 8 58 15 - 9 32 28 - 8 34 28 - 9 56 35 0.85 -158 0 0 - 9 25 41 17 37 9.5 7 286 20 - 9 8 34 - 9 42 52 - 8 44 44 -10 7 2 0.85 -157 0 0 - 9 36 43 17 37 7.9 6 285 21 - 9 19 34 - 9 53 56 - 8 55 40 -10 18 10 0.86 -156 0 0 - 9 48 26 17 37 6.5 5 285 22 - 9 31 14 -10 5 42 - 9 7 17 -10 29 59 0.87 -155 0 0 -10 0 49 17 37 5.5 4 285 23 - 9 43 35 -10 18 8 - 9 19 34 -10 42 29 0.89 -154 0 0 -10 13 54 17 37 4.6 3 285 24 - 9 56 37 -10 31 16 - 9 32 32 -10 55 41 0.92 -153 0 0 -10 27 40 17 37 4.1 2 285 25 -10 10 19 -10 45 4 - 9 46 10 -11 9 34 0.99 -152 0 0 -10 42 7 17 37 3.7 1 285 26 -10 24 43 -10 59 34 -10 0 30 -11 24 9 1.24 Uncertainty in time = +/- 5 secs Prediction of 2022 Dec 1.1 Data for the target star ------------------------ * name: UCAC4 522-038493 * constellation : Gemini * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 07 15 08.5313 DE: +14 12 50.397 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 07 15 08.5314 DE: +14 12 50.397 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1197) Rhodesia asteroid class: approx. diameter [km]: 48 approx. diameter ["]: 0.041 distance from Earth [AU]: 1.63840 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#54 date of fit: 2022 Nov 22 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): 0.038", 0.004", 110.977° remarks: * orbital elements for (1197)Rhodesia : Mean anomaly = 310.7789742667 deg Arg. of pericenter = 277.0709881209 deg Long. of node = 255.6161754153 deg Inclination = 12.9778582774 deg Eccentricity = 0.2342444134 Semimajor axis = 2.8820286207 AU Perihelion dist = 2.2069295171 AU Mag: H = 10.24, G = 0.15 Epoch of elements : MJD 59927.73993056 TDT (2022 Dec 14.7399) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542022Nov22,4.99,2022,12,14,17.760510,0.285923,-0.552907,-4.867154,-2.517000,-0.002472,0.001065,0.000001,0.000000 119.3287,14.1743,-87.72,-23.24,False UCAC4 522-038493,7.25236981,14.2139993,0.00,12.50,0.00,0.0,0,,7.27416749,14.1742663,1.76,0.00,0,0,0 1197,Rhodesia,14.02,48.4,1.6384,0,0,-1.797,-13.51,,2.4,0 0,310.6299,2022,12,14,277.0710,255.6162,12.9779,0.23424,2.88203,2.20693,10.26,5.0,0.15 1.700,0.0380,0.0040,111,0.0285,Known errors,-1.00,-1,-1,-1 20221214_038493,59914.08 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Dec 01, 02:01 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org