IOTA/IOTA-ES occultation update for (76) Freia / UCAC4-344-097974 event on 2023 Oct 13, 12:10 UT Visible from S Australia Summary ------- On 2023 Oct 13 UT, the 166.8 km diameter asteroid (76) Freia will occult a 12.5 mag star in the constellation Ophiuchus for observers along a path across S Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.59 mag to 14.99 mag (the magnitude of the asteroid) for at most 6.140 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 Oct 13, 12:06 - 2023 Oct 13, 12:14 * geocentric midpoint of event [JD]: 2460231.00715263 * magnitude of target star: 12.50 * magnitude drop [mag]: 2.59 * estimated maximum duration [s]: 6.140 * Moon: 2 % sunlit, 77° distance * Sun: 63° distance * rough path description: S Australia Additional comments ------------------- RUWE high The occultation path -------------------- * approximate projected width [km]: 180 * 1 sigma uncertainty interval [path widths]: +/- 0.01 * 1 sigma uncertainty interval [seconds]: +/- 0.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.003, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.003", 0.001", 93°) * approx speed of asteroid's shadow [km/s]: 27.1792 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-344-097974 by 76 Freia on 2023 Oct 13 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 - 37 0 0 -16 32 51 12 6 40.0 0 112 58 -17 25 50 -15 40 13 -17 27 18 -15 38 46 .... - 36 0 0 -16 56 48 12 6 40.0 1 112 58 -17 49 50 -16 4 6 -17 51 18 -16 2 40 0.36 - 35 0 0 -17 20 50 12 6 40.2 3 112 59 -18 13 56 -16 28 6 -18 15 23 -16 26 39 0.38 - 34 0 0 -17 44 59 12 6 40.4 4 111 60 -18 38 7 -16 52 12 -18 39 34 -16 50 45 0.39 - 33 0 0 -18 9 12 12 6 40.8 5 111 61 -19 2 22 -17 16 22 -19 3 50 -17 14 56 0.39 - 32 0 0 -18 33 29 12 6 41.2 6 111 62 -19 26 42 -17 40 37 -19 28 10 -17 39 11 0.39 - 31 0 0 -18 57 50 12 6 41.7 7 110 62 -19 51 6 -18 4 56 -19 52 34 -18 3 30 0.40 - 30 0 0 -19 22 15 12 6 42.2 8 110 63 -20 15 32 -18 29 19 -20 17 0 -18 27 52 0.40 - 29 0 0 -19 46 41 12 6 42.9 9 110 64 -20 40 1 -18 53 43 -20 41 29 -18 52 16 0.40 - 28 0 0 -20 11 10 12 6 43.6 10 109 65 -21 4 31 -19 18 10 -21 5 59 -19 16 43 0.40 - 27 0 0 -20 35 39 12 6 44.4 11 109 65 -21 29 2 -19 42 38 -21 30 30 -19 41 11 0.40 - 26 0 0 -21 0 9 12 6 45.3 12 109 66 -21 53 33 -20 7 7 -21 55 2 -20 5 40 0.40 - 25 0 0 -21 24 39 12 6 46.3 13 108 66 -22 18 4 -20 31 36 -22 19 33 -20 30 9 0.40 - 24 0 0 -21 49 9 12 6 47.3 14 108 67 -22 42 35 -20 56 4 -22 44 3 -20 54 37 0.40 - 23 0 0 -22 13 37 12 6 48.4 15 107 68 -23 7 3 -21 20 31 -23 8 32 -21 19 4 0.40 - 22 0 0 -22 38 2 12 6 49.6 16 107 68 -23 31 30 -21 44 57 -23 32 58 -21 43 30 0.40 - 21 0 0 -23 2 26 12 6 50.9 17 107 68 -23 55 53 -22 9 20 -23 57 22 -22 7 52 0.40 - 20 0 0 -23 26 46 12 6 52.2 18 106 69 -24 20 13 -22 33 40 -24 21 42 -22 32 12 0.40 - 19 0 0 -23 51 2 12 6 53.6 19 106 69 -24 44 30 -22 57 56 -24 45 58 -22 56 29 0.40 - 18 0 0 -24 15 14 12 6 55.0 20 105 69 -25 8 41 -23 22 8 -25 10 10 -23 20 41 0.40 - 17 0 0 -24 39 20 12 6 56.6 21 105 70 -25 32 47 -23 46 15 -25 34 16 -23 44 48 0.40 - 16 0 0 -25 3 21 12 6 58.2 22 104 70 -25 56 48 -24 10 17 -25 58 16 -24 8 49 0.40 - 15 0 0 -25 27 16 12 6 59.8 23 104 70 -26 20 42 -24 34 12 -26 22 10 -24 32 45 0.40 - 14 0 0 -25 51 4 12 7 1.6 24 103 70 -26 44 29 -24 58 1 -26 45 57 -24 56 34 0.40 - 13 0 0 -26 14 45 12 7 3.4 25 103 70 -27 8 8 -25 21 43 -27 9 37 -25 20 16 0.40 - 12 0 0 -26 38 18 12 7 5.2 26 102 70 -27 31 40 -25 45 18 -27 33 8 -25 43 51 0.40 - 11 0 0 -27 1 42 12 7 7.1 27 102 70 -27 55 3 -26 8 44 -27 56 31 -26 7 17 0.40 - 10 0 0 -27 24 58 12 7 9.1 28 101 70 -28 18 16 -26 32 1 -28 19 44 -26 30 34 0.40 - 9 0 0 -27 48 4 12 7 11.1 29 101 70 -28 41 20 -26 55 9 -28 42 48 -26 53 42 0.40 - 8 0 0 -28 11 0 12 7 13.2 29 100 69 -29 4 14 -27 18 7 -29 5 42 -27 16 40 0.40 - 7 0 0 -28 33 45 12 7 15.3 30 99 69 -29 26 57 -27 40 55 -29 28 25 -27 39 28 0.40 - 6 0 0 -28 56 20 12 7 17.5 31 99 69 -29 49 29 -28 3 32 -29 50 57 -28 2 5 0.40 - 5 0 0 -29 18 43 12 7 19.7 32 98 69 -30 11 49 -28 25 57 -30 13 17 -28 24 31 0.40 - 4 0 0 -29 40 54 12 7 22.0 33 98 68 -30 33 57 -28 48 11 -30 35 25 -28 46 45 0.40 - 3 0 0 -30 2 53 12 7 24.3 34 97 68 -30 55 53 -29 10 13 -30 57 21 -29 8 47 0.40 - 2 0 0 -30 24 39 12 7 26.7 35 96 67 -31 17 36 -29 32 2 -31 19 3 -29 30 36 0.40 - 1 0 0 -30 46 12 12 7 29.1 36 95 67 -31 39 5 -29 53 38 -31 40 33 -29 52 12 0.40 - 0 0 0 -31 7 31 12 7 31.6 37 95 66 -32 0 21 -30 15 1 -32 1 49 -30 13 35 0.40 1 0 0 -31 28 36 12 7 34.1 38 94 66 -32 21 23 -30 36 10 -32 22 50 -30 34 44 0.40 2 0 0 -31 49 27 12 7 36.6 39 93 65 -32 42 10 -30 57 5 -32 43 37 -30 55 39 0.40 3 0 0 -32 10 4 12 7 39.2 39 92 64 -33 2 43 -31 17 45 -33 4 10 -31 16 19 0.40 4 0 0 -32 30 25 12 7 41.8 40 92 64 -33 23 0 -31 38 11 -33 24 27 -31 36 45 0.40 5 0 0 -32 50 31 12 7 44.4 41 91 63 -33 43 2 -31 58 21 -33 44 29 -31 56 55 0.40 6 0 0 -33 10 22 12 7 47.1 42 90 63 -34 2 49 -32 18 16 -34 4 15 -32 16 50 0.40 7 0 0 -33 29 57 12 7 49.8 43 89 62 -34 22 19 -32 37 55 -34 23 45 -32 36 29 0.40 8 0 0 -33 49 15 12 7 52.5 44 88 61 -34 41 33 -32 57 17 -34 42 59 -32 55 52 0.40 8 59 59 -34 8 17 12 7 55.3 45 87 61 -35 0 30 -33 16 24 -35 1 57 -33 14 59 0.40 9 59 59 -34 27 3 12 7 58.1 45 86 60 -35 19 11 -33 35 14 -35 20 37 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49 -41 34 46 0.40 47 59 59 -42 32 1 12 9 53.1 67 26 31 -43 21 17 -41 43 3 -43 22 38 -41 41 42 0.40 48 59 59 -42 38 35 12 9 56.2 67 23 31 -43 27 47 -41 49 39 -43 29 9 -41 48 19 0.40 49 59 59 -42 44 50 12 9 59.2 68 21 30 -43 33 59 -41 55 57 -43 35 20 -41 54 36 0.40 50 59 59 -42 50 45 12 10 2.3 68 18 29 -43 39 52 -42 1 55 -43 41 13 -42 0 35 0.40 51 59 59 -42 56 22 12 10 5.4 68 16 29 -43 45 26 -42 7 34 -43 46 47 -42 6 14 0.40 52 59 59 -43 1 40 12 10 8.4 68 13 28 -43 50 41 -42 12 55 -43 52 2 -42 11 34 0.40 53 59 59 -43 6 38 12 10 11.5 68 11 27 -43 55 38 -42 17 56 -43 56 58 -42 16 36 0.40 54 59 59 -43 11 18 12 10 14.5 68 8 26 -44 0 15 -42 22 38 -44 1 36 -42 21 18 0.40 55 59 59 -43 15 39 12 10 17.6 68 6 26 -44 4 34 -42 27 1 -44 5 55 -42 25 41 0.40 56 59 59 -43 19 41 12 10 20.6 68 3 25 -44 8 34 -42 31 5 -44 9 55 -42 29 45 0.40 57 59 59 -43 23 25 12 10 23.6 68 1 24 -44 12 16 -42 34 50 -44 13 36 -42 33 30 0.40 58 59 59 -43 26 49 12 10 26.7 68 358 23 -44 15 38 -42 38 16 -44 16 59 -42 36 56 0.40 59 59 59 -43 29 55 12 10 29.7 68 355 23 -44 18 42 -42 41 23 -44 20 3 -42 40 3 0.40 60 59 59 -43 32 41 12 10 32.7 68 353 22 -44 21 28 -42 44 11 -44 22 49 -42 42 51 0.40 61 59 59 -43 35 9 12 10 35.7 68 351 21 -44 23 55 -42 46 40 -44 25 15 -42 45 21 0.40 62 59 59 -43 37 19 12 10 38.7 67 348 20 -44 26 3 -42 48 51 -44 27 24 -42 47 31 0.40 63 59 59 -43 39 9 12 10 41.7 67 346 20 -44 27 53 -42 50 42 -44 29 13 -42 49 22 0.40 64 59 59 -43 40 41 12 10 44.7 67 343 19 -44 29 24 -42 52 15 -44 30 44 -42 50 55 0.40 65 59 59 -43 41 54 12 10 47.7 67 341 18 -44 30 36 -42 53 28 -44 31 57 -42 52 9 0.40 66 59 59 -43 42 49 12 10 50.6 66 339 18 -44 31 30 -42 54 23 -44 32 51 -42 53 4 0.40 67 59 59 -43 43 24 12 10 53.6 66 336 17 -44 32 6 -42 54 59 -44 33 26 -42 53 40 0.40 68 59 59 -43 43 41 12 10 56.5 66 334 16 -44 32 22 -42 55 16 -44 33 43 -42 53 57 0.40 69 59 59 -43 43 40 12 10 59.5 66 332 15 -44 32 21 -42 55 14 -44 33 41 -42 53 55 0.40 70 59 59 -43 43 19 12 11 2.4 65 330 15 -44 32 1 -42 54 54 -44 33 21 -42 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12 13 33.6 24 259 -33 -34 21 22 -32 36 58 -34 22 49 -32 35 33 0.42 133 0 0 -33 9 30 12 13 35.2 23 259 -34 -34 1 56 -32 17 24 -34 3 23 -32 15 59 0.42 134 0 0 -32 49 44 12 13 36.8 22 258 -35 -33 42 15 -31 57 34 -33 43 42 -31 56 9 0.42 135 0 0 -32 29 43 12 13 38.3 21 258 -36 -33 22 18 -31 37 29 -33 23 45 -31 36 3 0.42 136 0 0 -32 9 27 12 13 39.7 20 257 -37 -33 2 5 -31 17 9 -33 3 32 -31 15 43 0.42 137 0 0 -31 48 56 12 13 41.1 20 256 -38 -32 41 38 -30 56 35 -32 43 6 -30 55 9 0.42 138 0 0 -31 28 11 12 13 42.5 19 256 -38 -32 20 57 -30 35 46 -32 22 24 -30 34 20 0.42 139 0 0 -31 7 12 12 13 43.7 18 255 -39 -32 0 1 -30 14 43 -32 1 28 -30 13 17 0.42 140 0 0 -30 45 59 12 13 45.0 17 255 -40 -31 38 51 -29 53 27 -31 40 19 -29 52 0 0.42 141 0 0 -30 24 32 12 13 46.1 16 254 -41 -31 17 28 -29 31 57 -31 18 56 -29 30 31 0.42 142 0 0 -30 2 53 12 13 47.2 15 254 -42 -30 55 52 -29 10 15 -30 57 20 -29 8 48 0.43 143 0 0 -29 41 1 12 13 48.3 14 253 -43 -30 34 3 -28 48 20 -30 35 31 -28 46 53 0.43 144 0 0 -29 18 57 12 13 49.2 13 253 -44 -30 12 2 -28 26 13 -30 13 30 -28 24 47 0.43 145 0 0 -28 56 42 12 13 50.2 12 252 -44 -29 49 49 -28 3 55 -29 51 17 -28 2 28 0.43 146 0 0 -28 34 15 12 13 51.0 11 252 -45 -29 27 25 -27 41 26 -29 28 53 -27 39 59 0.43 147 0 0 -28 11 37 12 13 51.8 10 251 -46 -29 4 49 -27 18 46 -29 6 17 -27 17 19 0.44 148 0 0 -27 48 49 12 13 52.5 9 251 -47 -28 42 3 -26 55 56 -28 43 31 -26 54 29 0.44 149 0 0 -27 25 51 12 13 53.2 8 250 -48 -28 19 8 -26 32 56 -28 20 36 -26 31 30 0.45 150 0 0 -27 2 44 12 13 53.8 7 250 -49 -27 56 2 -26 9 48 -27 57 30 -26 8 21 0.45 151 0 0 -26 39 28 12 13 54.3 6 249 -50 -27 32 48 -25 46 30 -27 34 16 -25 45 3 0.46 152 0 0 -26 16 4 12 13 54.7 5 249 -50 -27 9 25 -25 23 5 -27 10 53 -25 21 38 0.47 153 0 0 -25 52 32 12 13 55.1 4 248 -51 -26 45 54 -24 59 32 -26 47 23 -24 58 5 0.49 154 0 0 -25 28 53 12 13 55.4 3 248 -52 -26 22 16 -24 35 52 -26 23 45 -24 34 25 0.51 155 0 0 -25 5 7 12 13 55.6 2 247 -53 -25 58 31 -24 12 5 -26 0 0 -24 10 38 0.55 156 0 0 -24 41 15 12 13 55.7 1 247 -54 -25 34 40 -23 48 13 -25 36 8 -23 46 45 0.66 157 0 0 -24 17 18 12 13 55.8 0 247 -54 -25 10 43 -23 24 15 -25 12 11 -23 22 48 1.34 Uncertainty in time = +/- 0 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: UCAC4-344-097974 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 29 02.5760 DE: -21 23 41.169 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 29 02.5759 DE: -21 23 41.169 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (76) Freia asteroid class: approx. diameter [km]: 167 approx. diameter ["]: 0.053 distance from Earth [AU]: 4.32990 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#76 date of fit: 2023 Aug 24 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): 0.003", 0.001", 92.532° remarks: * orbital elements for (76)Freia : Mean anomaly = 179.2617590979 deg Arg. of pericenter = 251.9899714534 deg Long. of node = 204.2891552145 deg Inclination = 2.1228776048 deg Eccentricity = 0.1670583049 Semimajor axis = 3.4116156925 AU Perihelion dist = 2.8416769580 AU Mag: H = 8.09, G = 0.15 Epoch of elements : MJD 60230.50701389 TDT (2023 Oct 13.5070) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#762023Aug24,6.14,2023,10,13,12.171663,-0.026710,-0.368769,15.299781,-1.119890,0.005344,-0.000188,-0.000001,0.000000 58.2379,-21.4142,-6.00,-7.78,False UCAC4-344-097974,17.48404893,-21.3947692,0.00,12.50,0.00,0.0,0,,17.50743077,-21.4142017,2.60,0.00,0,0,0 76,Freia,14.99,166.800,4.3299,0,0,2.225,-2.27,,8.4,0 0,179.1825,2023,10,13,251.9900,204.2892,2.1229,0.16706,3.41162,2.84168,8.05,5.0,0.15 1.014,0.0029,0.0007,93,0.0030,Known errors,-1.00,0,-1,-1 20231013_097974,60183.00 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:58 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org