IOTA/IOTA-ES occultation update for (194) Prokne / UCAC4-500-058989 event on 2023 Mar 31, 00:54 UT Visible from Africa, SE USA Summary ------- On 2023 Mar 31 UT, the 170.6 km diameter asteroid (194) Prokne will occult a 12.2 mag star in the constellation Virgo for observers along a path across Africa, SE USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.73 mag to 12.12 mag (the magnitude of the asteroid) for at most 11.150 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: 100 * date and approx. time of event: 2023 Mar 31, 00:47 - 2023 Mar 31, 01:01 * geocentric midpoint of event [JD]: 2460034.53800409 * magnitude of target star: 12.16 * magnitude drop [mag]: 0.73 * estimated maximum duration [s]: 11.150 * Moon: 67 % sunlit, 67° distance * Sun: 166° distance * rough path description: Africa, SE USA The occultation path -------------------- * approximate projected width [km]: 175 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 0.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.011, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.011", 0.003", 96°) * approx speed of asteroid's shadow [km/s]: 15.2959 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-500-058989 by 194 Prokne on 2023 Mar 31 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 -106 0 0 27 27 14 1 1 29.4 0 79 3 28 15 27 .. .. .. 28 20 49 .. .. .. .... -105 0 0 27 37 7 1 1 29.3 1 80 2 28 25 14 26 48 51 28 30 35 26 43 27 0.08 -104 0 0 27 46 21 1 1 29.2 2 80 2 28 34 21 26 58 10 28 39 42 26 52 47 0.16 -103 0 0 27 54 55 1 1 28.9 3 81 1 28 42 50 27 6 50 28 48 10 27 1 28 0.18 -102 0 0 28 2 50 1 1 28.5 4 81 0 28 50 39 27 14 50 28 55 58 27 9 29 0.20 -101 0 0 28 10 5 1 1 28.0 5 81 -1 28 57 50 27 22 11 29 3 9 27 16 50 0.21 -100 0 0 28 16 42 1 1 27.4 5 82 -2 29 4 23 27 28 52 29 9 41 27 23 32 0.21 - 99 0 0 28 22 41 1 1 26.8 6 82 -3 29 10 17 27 34 55 29 15 35 27 29 35 0.21 - 98 0 0 28 28 1 1 1 26.0 7 83 -4 29 15 34 27 40 19 29 20 51 27 34 59 0.22 - 97 0 0 28 32 43 1 1 25.1 8 83 -4 29 20 12 27 45 4 29 25 29 27 39 45 0.22 - 96 0 0 28 36 47 1 1 24.1 9 84 -5 29 24 13 27 49 11 29 29 30 27 43 52 0.22 - 95 0 0 28 40 13 1 1 23.0 10 84 -6 29 27 37 27 52 39 29 32 54 27 47 21 0.22 - 94 0 0 28 43 1 1 1 21.9 11 85 -7 29 30 23 27 55 30 29 35 40 27 50 11 0.22 - 93 0 0 28 45 12 1 1 20.6 12 85 -8 29 32 33 27 57 42 29 37 49 27 52 24 0.22 - 92 0 0 28 46 45 1 1 19.2 12 86 -9 29 34 5 27 59 16 29 39 21 27 53 58 0.22 - 91 0 0 28 47 41 1 1 17.8 13 86 -10 29 35 0 28 0 13 29 40 16 27 54 55 0.23 - 90 0 0 28 48 0 1 1 16.2 14 87 -10 29 35 18 28 0 32 29 40 34 27 55 14 0.23 - 89 0 0 28 47 41 1 1 14.6 15 87 -11 29 34 59 28 0 13 29 40 15 27 54 55 0.23 - 88 0 0 28 46 45 1 1 12.8 16 88 -12 29 34 3 27 59 17 29 39 19 27 53 59 0.23 - 87 0 0 28 45 11 1 1 11.0 17 88 -13 29 32 31 27 57 43 29 37 47 27 52 24 0.23 - 86 0 0 28 43 1 1 1 9.1 18 88 -14 29 30 22 27 55 31 29 35 38 27 50 12 0.23 - 85 0 0 28 40 13 1 1 7.0 19 89 -15 29 27 35 27 52 41 29 32 52 27 47 23 0.23 - 84 0 0 28 36 48 1 1 4.9 19 89 -16 29 24 12 27 49 14 29 29 29 27 43 56 0.23 - 83 0 0 28 32 45 1 1 2.7 20 90 -16 29 20 12 27 45 10 29 25 29 27 39 51 0.23 - 82 0 0 28 28 6 1 1 0.4 21 90 -17 29 15 35 27 40 27 29 20 52 27 35 8 0.23 - 81 0 0 28 22 49 1 0 58.0 22 91 -18 29 10 21 27 35 7 29 15 39 27 29 47 0.23 - 80 0 0 28 16 54 1 0 55.4 23 91 -19 29 4 30 27 29 8 29 9 48 27 23 48 0.23 - 79 0 0 28 10 21 1 0 52.8 24 92 -20 28 58 1 27 22 32 29 3 20 27 17 12 0.23 - 78 0 0 28 3 11 1 0 50.1 25 92 -21 28 50 56 27 15 18 28 56 14 27 9 57 0.23 - 77 0 0 27 55 23 1 0 47.3 26 92 -22 28 43 12 27 7 25 28 48 32 27 2 3 0.23 - 76 0 0 27 46 57 1 0 44.4 26 93 -23 28 34 52 26 58 54 28 40 11 26 53 32 0.23 - 75 0 0 27 37 53 1 0 41.4 27 93 -23 28 25 53 26 49 44 28 31 13 26 44 22 0.23 - 74 0 0 27 28 11 1 0 38.3 28 94 -24 28 16 16 26 39 56 28 21 37 26 34 33 0.23 - 73 0 0 27 17 50 1 0 35.1 29 94 -25 28 6 2 26 29 29 28 11 24 26 24 5 0.23 - 72 0 0 27 6 50 1 0 31.8 30 94 -26 27 55 9 26 18 23 28 0 31 26 12 58 0.23 - 71 0 0 26 55 12 1 0 28.4 31 95 -27 27 43 37 26 6 37 27 49 1 26 1 11 0.23 - 70 0 0 26 42 55 1 0 24.9 32 95 -28 27 31 27 25 54 12 27 36 51 25 48 46 0.23 - 69 0 0 26 29 58 1 0 21.3 33 95 -29 27 18 38 25 41 8 27 24 3 25 35 40 0.23 - 68 0 0 26 16 21 1 0 17.6 34 96 -30 27 5 10 25 27 23 27 10 36 25 21 55 0.23 - 67 0 0 26 2 5 1 0 13.8 34 96 -31 26 51 2 25 12 58 26 56 29 25 7 29 0.23 - 66 0 0 25 47 9 1 0 9.9 35 96 -32 26 36 15 24 57 53 26 41 43 24 52 23 0.23 - 65 0 0 25 31 33 1 0 5.8 36 97 -32 26 20 48 24 42 8 26 26 16 24 36 37 0.23 - 64 0 0 25 15 16 1 0 1.7 37 97 -33 26 4 40 24 25 41 26 10 10 24 20 9 0.23 - 63 0 0 24 58 18 0 59 57.4 38 97 -34 25 47 52 24 8 33 25 53 23 24 3 0 0.23 - 62 0 0 24 40 39 0 59 53.0 39 98 -35 25 30 24 23 50 44 25 35 56 23 45 10 0.23 - 61 0 0 24 22 19 0 59 48.6 40 98 -36 25 12 14 23 32 13 25 17 47 23 26 38 0.23 - 60 0 0 24 3 17 0 59 44.0 41 98 -37 24 53 23 23 13 1 24 58 58 23 7 24 0.23 - 59 0 0 23 43 34 0 59 39.2 42 98 -38 24 33 51 22 53 5 24 39 27 22 47 27 0.23 - 58 0 0 23 23 8 0 59 34.4 43 99 -39 24 13 37 22 32 28 24 19 14 22 26 48 0.23 - 57 0 0 23 1 59 0 59 29.5 44 99 -40 23 52 40 22 11 7 23 58 19 22 5 27 0.23 - 56 0 0 22 40 8 0 59 24.4 45 99 -41 23 31 2 21 49 4 23 36 41 21 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49 23 15 49 6 0.23 - 42 0 0 16 17 9 0 58 0.7 58 98 -55 17 11 26 15 22 40 17 17 28 15 16 34 0.23 - 41 0 0 15 44 10 0 57 53.8 59 97 -56 16 38 43 14 49 24 16 44 47 14 43 17 0.23 - 40 0 0 15 10 26 0 57 46.7 60 97 -57 16 5 15 14 15 23 16 11 21 14 9 14 0.23 - 39 0 0 14 35 56 0 57 39.6 61 96 -59 15 31 2 13 40 36 15 37 9 13 34 25 0.23 - 38 0 0 14 0 40 0 57 32.3 62 96 -60 14 56 3 13 5 4 15 2 13 12 58 51 0.23 - 37 0 0 13 24 40 0 57 24.9 63 95 -61 14 20 19 12 28 46 14 26 31 12 22 31 0.23 - 36 0 0 12 47 54 0 57 17.3 64 94 -62 13 43 51 11 51 43 13 50 4 11 45 26 0.23 - 35 0 0 12 10 24 0 57 9.7 65 93 -63 13 6 38 11 13 55 13 12 53 11 7 36 0.23 - 34 0 0 11 32 9 0 57 1.9 66 92 -64 12 28 40 10 35 23 12 34 57 10 29 2 0.23 - 33 0 0 10 53 10 0 56 54.0 67 91 -65 11 49 58 9 56 6 11 56 17 9 49 43 0.23 - 32 0 0 10 13 26 0 56 46.1 68 89 -66 11 10 32 9 16 5 11 16 53 9 9 41 0.23 - 31 0 0 9 33 0 0 56 38.0 69 88 -68 10 30 23 8 35 21 10 36 46 8 28 55 0.23 - 30 0 0 8 51 51 0 56 29.7 70 86 -69 9 49 31 7 53 54 9 55 56 7 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36.3 39 322 -48 -31 38 45 -33 42 47 -31 31 52 -33 49 44 0.24 22 0 0 -33 22 42 0 49 31.3 38 321 -47 -32 21 6 -34 24 40 -32 14 15 -34 31 35 0.24 23 0 0 -34 4 6 0 49 26.4 37 320 -46 -33 2 45 -35 5 49 -32 55 56 -35 12 43 0.24 24 0 0 -34 44 45 0 49 21.7 36 319 -45 -33 43 39 -35 46 12 -33 36 52 -35 53 5 0.24 25 0 0 -35 24 40 0 49 17.1 35 319 -44 -34 23 49 -36 25 51 -34 17 4 -36 32 42 0.24 26 0 0 -36 3 49 0 49 12.7 34 318 -43 -35 3 15 -37 4 44 -34 56 31 -37 11 33 0.24 27 0 0 -36 42 13 0 49 8.5 33 317 -42 -35 41 55 -37 42 51 -35 35 13 -37 49 38 0.24 28 0 0 -37 19 50 0 49 4.5 32 317 -41 -36 19 49 -38 20 11 -36 13 9 -38 26 56 0.24 29 0 0 -37 56 42 0 49 0.6 31 316 -40 -36 56 58 -38 56 46 -36 50 19 -39 3 29 0.24 30 0 0 -38 32 48 0 48 56.8 30 315 -39 -37 33 21 -39 32 33 -37 26 44 -39 39 14 0.24 31 0 0 -39 8 7 0 48 53.2 29 315 -38 -38 8 58 -40 7 35 -38 2 23 -40 14 14 0.24 32 0 0 -39 42 40 0 48 49.8 28 314 -37 -38 43 48 -40 41 50 -38 37 16 -40 48 26 0.24 33 0 0 -40 16 27 0 48 46.5 27 313 -36 -39 17 53 -41 15 18 -39 11 23 -41 21 53 0.24 34 0 0 -40 49 28 0 48 43.4 27 313 -35 -39 51 12 -41 48 1 -39 44 44 -41 54 33 0.24 35 0 0 -41 21 43 0 48 40.4 26 312 -34 -40 23 46 -42 19 57 -40 17 19 -42 26 28 0.24 36 0 0 -41 53 13 0 48 37.5 25 311 -34 -40 55 34 -42 51 8 -40 49 9 -42 57 37 0.24 37 0 0 -42 23 57 0 48 34.7 24 310 -33 -41 26 37 -43 21 34 -41 20 14 -43 28 1 0.24 38 0 0 -42 53 57 0 48 32.1 23 310 -32 -41 56 55 -43 51 15 -41 50 34 -43 57 39 0.24 39 0 0 -43 23 12 0 48 29.6 22 309 -31 -42 26 28 -44 20 11 -42 20 9 -44 26 34 0.24 40 0 0 -43 51 42 0 48 27.3 21 308 -30 -42 55 17 -44 48 24 -42 49 1 -44 54 44 0.24 41 0 0 -44 19 29 0 48 25.0 20 308 -29 -43 23 22 -45 15 52 -43 17 8 -45 22 10 0.24 42 0 0 -44 46 33 0 48 22.9 20 307 -28 -43 50 45 -45 42 38 -43 44 32 -45 48 54 0.24 43 0 0 -45 12 54 0 48 20.9 19 306 -28 -44 17 24 -46 8 40 -44 11 13 -46 14 54 0.24 44 0 0 -45 38 33 0 48 19.0 18 305 -27 -44 43 20 -46 34 1 -44 37 12 -46 40 13 0.24 45 0 0 -46 3 30 0 48 17.2 17 305 -26 -45 8 35 -46 58 40 -45 2 29 -47 4 50 0.24 46 0 0 -46 27 46 0 48 15.4 16 304 -25 -45 33 8 -47 22 38 -45 27 4 -47 28 46 0.24 47 0 0 -46 51 21 0 48 13.8 16 303 -24 -45 57 1 -47 45 55 -45 50 58 -47 52 1 0.24 48 0 0 -47 14 16 0 48 12.3 15 303 -24 -46 20 13 -48 8 33 -46 14 12 -48 14 37 0.24 49 0 0 -47 36 31 0 48 10.9 14 302 -23 -46 42 45 -48 30 31 -46 36 46 -48 36 33 0.24 50 0 0 -47 58 7 0 48 9.6 13 301 -22 -47 4 38 -48 51 50 -46 58 41 -48 57 50 0.24 51 0 0 -48 19 5 0 48 8.3 12 300 -21 -47 25 52 -49 12 31 -47 19 57 -49 18 29 0.24 52 0 0 -48 39 24 0 48 7.2 12 300 -21 -47 46 28 -49 32 34 -47 40 34 -49 38 31 0.24 53 0 0 -48 59 7 0 48 6.1 11 299 -20 -48 6 26 -49 52 1 -48 0 34 -49 57 55 0.24 54 0 0 -49 18 12 0 48 5.1 10 298 -19 -48 25 47 -50 10 50 -48 19 57 -50 16 43 0.24 55 0 0 -49 36 41 0 48 4.2 10 297 -18 -48 44 31 -50 29 4 -48 38 43 -50 34 55 0.24 56 0 0 -49 54 35 0 48 3.3 9 297 -18 -49 2 39 -50 46 42 -48 56 53 -50 52 31 0.24 57 0 0 -50 11 53 0 48 2.6 8 296 -17 -49 20 12 -51 3 45 -49 14 27 -51 9 33 0.24 58 0 0 -50 28 36 0 48 1.9 7 295 -16 -49 37 10 -51 20 14 -49 31 26 -51 26 0 0.24 59 0 0 -50 44 45 0 48 1.2 7 294 -16 -49 53 33 -51 36 10 -49 47 51 -51 41 54 0.24 60 0 0 -51 0 21 0 48 0.7 6 293 -15 -50 9 22 -51 51 31 -50 3 41 -51 57 14 0.24 61 0 0 -51 15 23 0 48 0.2 5 293 -14 -50 24 37 -52 6 20 -50 18 58 -52 12 2 0.24 62 0 0 -51 29 53 0 47 59.7 5 292 -14 -50 39 20 -52 20 37 -50 33 42 -52 26 17 0.24 63 0 0 -51 43 50 0 47 59.4 4 291 -13 -50 53 30 -52 34 22 -50 47 54 -52 40 0 0.23 64 0 0 -51 57 16 0 47 59.1 3 290 -12 -51 7 8 -52 47 35 -51 1 33 -52 53 13 0.23 65 0 0 -52 10 10 0 47 58.8 3 290 -12 -51 20 14 -53 0 18 -51 14 40 -53 5 54 0.23 66 0 0 -52 22 34 0 47 58.6 2 289 -11 -51 32 49 -53 12 30 -51 27 16 -53 18 5 0.23 67 0 0 -52 34 27 0 47 58.5 1 288 -11 -51 44 53 -53 24 12 -51 39 22 -53 29 45 0.23 68 0 0 -52 45 50 0 47 58.4 1 287 -10 -51 56 26 -53 35 24 -51 50 56 -53 40 56 0.23 69 0 0 -52 56 43 0 47 58.3 0 286 -9 -52 7 30 .. .. .. -52 2 1 .. .. .. 0.20 Uncertainty in time = +/- 1 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: UCAC4-500-058989 * constellation : Virgo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 12 48 35.9070 DE: +09 48 20.421 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 12 48 35.9070 DE: +09 48 20.421 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (194) Prokne asteroid class: approx. diameter [km]: 171 approx. diameter ["]: 0.120 distance from Earth [AU]: 1.96770 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#151 date of fit: 2023 Feb 07 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): 0.011", 0.003", 96.134° remarks: * orbital elements for (194)Prokne : Mean anomaly = 249.4932904559 deg Arg. of pericenter = 163.1497017834 deg Long. of node = 159.2614259025 deg Inclination = 18.5096405135 deg Eccentricity = 0.2374312375 Semimajor axis = 2.6169040196 AU Perihelion dist = 1.9955692599 AU Mag: H = 7.87, G = 0.15 Epoch of elements : MJD 60034.03791667 TDT (2023 Mar 31.0379) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1512023Feb07,11.15,2023,3,31,0.912098,-0.147970,-0.171439,-6.535230,5.641513,-0.000297,-0.001381,0.000001,-0.000001 -9.3845,9.6776,167.42,3.98,False UCAC4-500-058989,12.80997416,9.8056725,0.00,12.16,0.00,0.0,0,,12.82972599,9.6775918,0.73,0.00,0,0,0 194,Prokne,12.12,170.6,1.9677,0,0,-1.975,25.21,,8.6,0 0,249.2516,2023,3,30,163.1497,159.2614,18.5096,0.23743,2.61690,1.99557,7.90,5.0,0.15 1.056,0.0107,0.0033,96,0.0067,Known errors,-1.00,-1,-1,-1 20230331_058989,59990.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:55 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org