IOTA/IOTA-ES occultation update for (76) Freia / UCAC4 345-095342 event on 2023 Sep 28, 00:42 UT Visible from South America Summary ------- On 2023 Sep 28 UT, the 166.8 km diameter asteroid (76) Freia will occult a 12.3 mag star in the constellation Ophiuchus for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.68 mag to 14.92 mag (the magnitude of the asteroid) for at most 7.890 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 Sep 28, 00:37 - 2023 Sep 28, 00:47 * geocentric midpoint of event [JD]: 2460215.52943266 * magnitude of target star: 12.34 * magnitude drop [mag]: 2.68 * estimated maximum duration [s]: 7.890 * Moon: 97 % sunlit, 85° distance * Sun: 76° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 173 * 1 sigma uncertainty interval [path widths]: +/- 0.01 * 1 sigma uncertainty interval [seconds]: +/- 0.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.003, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.003", 0.001", 94°) * approx speed of asteroid's shadow [km/s]: 21.1475 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 345-095342 by 76 Freia on 2023 Sep 28 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 150 0 0 - 9 20 47 0 37 33.0 0 111 70 -10 11 35 .. .. .. -10 12 58 .. .. .. .... 151 0 0 - 9 44 18 0 37 33.1 1 111 71 -10 35 9 - 8 53 41 -10 36 31 - 8 52 19 0.28 152 0 0 -10 7 57 0 37 33.2 2 111 72 -10 58 51 - 9 17 17 -11 0 14 - 9 15 55 0.29 153 0 0 -10 31 44 0 37 33.5 3 111 72 -11 22 41 - 9 41 1 -11 24 4 - 9 39 40 0.29 154 0 0 -10 55 39 0 37 33.9 4 111 73 -11 46 39 -10 4 53 -11 48 1 -10 3 32 0.29 155 0 0 -11 19 41 0 37 34.4 5 111 74 -12 10 43 -10 28 53 -12 12 6 -10 27 31 0.29 156 0 0 -11 43 49 0 37 35.0 6 110 74 -12 34 54 -10 52 58 -12 36 16 -10 51 36 0.29 157 0 0 -12 8 3 0 37 35.7 7 110 75 -12 59 10 -11 17 10 -13 0 33 -11 15 48 0.29 158 0 0 -12 32 22 0 37 36.5 9 110 75 -13 23 31 -11 41 27 -13 24 54 -11 40 5 0.29 159 0 0 -12 56 46 0 37 37.4 10 110 76 -13 47 57 -12 5 49 -13 49 20 -12 4 27 0.29 160 0 0 -13 21 13 0 37 38.5 11 109 76 -14 12 26 -12 30 15 -14 13 49 -12 28 52 0.29 161 0 0 -13 45 44 0 37 39.6 12 109 76 -14 36 59 -12 54 44 -14 38 22 -12 53 22 0.29 162 0 0 -14 10 18 0 37 40.8 13 109 76 -15 1 34 -13 19 16 -15 2 57 -13 17 54 0.29 163 0 0 -14 34 53 0 37 42.1 14 109 76 -15 26 11 -13 43 50 -15 27 34 -13 42 28 0.29 164 0 0 -14 59 31 0 37 43.6 15 108 76 -15 50 49 -14 8 26 -15 52 12 -14 7 4 0.29 165 0 0 -15 24 9 0 37 45.1 16 108 76 -16 15 28 -14 33 3 -16 16 51 -14 31 41 0.29 166 0 0 -15 48 47 0 37 46.8 17 108 76 -16 40 7 -14 57 41 -16 41 30 -14 56 19 0.29 167 0 0 -16 13 25 0 37 48.5 18 108 76 -17 4 46 -15 22 18 -17 6 9 -15 20 56 0.29 168 0 0 -16 38 1 0 37 50.3 19 107 75 -17 29 23 -15 46 54 -17 30 46 -15 45 32 0.29 169 0 0 -17 2 36 0 37 52.3 20 107 75 -17 53 58 -16 11 29 -17 55 21 -16 10 7 0.29 170 0 0 -17 27 9 0 37 54.3 21 107 74 -18 18 31 -16 36 2 -18 19 54 -16 34 39 0.29 171 0 0 -17 51 39 0 37 56.4 22 106 74 -18 43 0 -17 0 32 -18 44 24 -16 59 9 0.29 172 0 0 -18 16 5 0 37 58.6 23 106 73 -19 7 26 -17 24 58 -19 8 50 -17 23 36 0.29 173 0 0 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-32 20 32 -30 39 18 0.30 - 52 0 0 -31 13 34 0 46 30.1 30 262 -41 -32 3 2 -30 24 19 -32 4 23 -30 23 0 0.30 - 51 0 0 -30 57 2 0 46 32.5 29 262 -42 -31 46 34 -30 7 42 -31 47 55 -30 6 22 0.30 - 50 0 0 -30 40 11 0 46 35.0 28 261 -43 -31 29 48 -29 50 47 -31 31 8 -29 49 27 0.30 - 49 0 0 -30 23 2 0 46 37.3 27 260 -44 -31 12 44 -29 33 34 -31 14 4 -29 32 14 0.30 - 48 0 0 -30 5 36 0 46 39.6 27 260 -45 -30 55 22 -29 16 3 -30 56 42 -29 14 43 0.30 - 47 0 0 -29 47 52 0 46 41.8 26 259 -45 -30 37 42 -28 58 14 -30 39 3 -28 56 54 0.30 - 46 0 0 -29 29 50 0 46 44.0 25 259 -46 -30 19 45 -28 40 8 -30 21 5 -28 38 48 0.30 - 45 0 0 -29 11 31 0 46 46.1 24 258 -47 -30 1 30 -28 21 45 -30 2 51 -28 20 25 0.30 - 44 0 0 -28 52 55 0 46 48.1 23 258 -48 -29 42 59 -28 3 5 -29 44 20 -28 1 45 0.30 - 43 0 0 -28 34 3 0 46 50.1 22 257 -49 -29 24 10 -27 44 9 -29 25 32 -27 42 48 0.30 - 42 0 0 -28 14 54 0 46 52.0 21 257 -50 -29 5 6 -27 24 56 -29 6 27 -27 23 35 0.30 - 41 0 0 -27 55 29 0 46 53.8 20 256 -51 -28 45 45 -27 5 27 -28 47 6 -27 4 6 0.30 - 40 0 0 -27 35 49 0 46 55.5 19 255 -51 -28 26 8 -26 45 42 -28 27 29 -26 44 22 0.31 - 39 0 0 -27 15 52 0 46 57.2 18 255 -52 -28 6 15 -26 25 42 -28 7 37 -26 24 21 0.31 - 38 0 0 -26 55 41 0 46 58.8 17 255 -53 -27 46 8 -26 5 27 -27 47 29 -26 4 6 0.31 - 37 0 0 -26 35 14 0 47 0.3 16 254 -54 -27 25 45 -25 44 57 -27 27 7 -25 43 36 0.31 - 36 0 0 -26 14 33 0 47 1.7 15 254 -55 -27 5 7 -25 24 12 -27 6 29 -25 22 51 0.31 - 35 0 0 -25 53 38 0 47 3.1 14 253 -56 -26 44 15 -25 3 14 -26 45 38 -25 1 52 0.31 - 34 0 0 -25 32 29 0 47 4.4 13 253 -57 -26 23 10 -24 42 1 -26 24 32 -24 40 40 0.31 - 33 0 0 -25 11 6 0 47 5.6 12 252 -57 -26 1 50 -24 20 36 -26 3 13 -24 19 14 0.32 - 32 0 0 -24 49 31 0 47 6.7 11 252 -58 -25 40 18 -23 58 57 -25 41 40 -23 57 36 0.32 - 31 0 0 -24 27 42 0 47 7.7 10 251 -59 -25 18 33 -23 37 6 -25 19 55 -23 35 45 0.32 - 30 0 0 -24 5 42 0 47 8.6 9 251 -60 -24 56 35 -23 15 3 -24 57 58 -23 13 41 0.32 - 29 0 0 -23 43 30 0 47 9.5 8 251 -61 -24 34 26 -22 52 48 -24 35 48 -22 51 26 0.33 - 28 0 0 -23 21 6 0 47 10.2 7 250 -61 -24 12 5 -22 30 22 -24 13 27 -22 29 0 0.33 - 27 0 0 -22 58 32 0 47 10.9 6 250 -62 -23 49 33 -22 7 45 -23 50 55 -22 6 24 0.34 - 26 0 0 -22 35 47 0 47 11.5 5 249 -63 -23 26 50 -21 44 59 -23 28 13 -21 43 37 0.35 - 25 0 0 -22 12 53 0 47 11.9 4 249 -64 -23 3 57 -21 22 2 -23 5 20 -21 20 40 0.36 - 24 0 0 -21 49 48 0 47 12.3 3 249 -64 -22 40 55 -20 58 56 -22 42 18 -20 57 34 0.38 - 23 0 0 -21 26 35 0 47 12.6 2 248 -65 -22 17 44 -20 35 41 -22 19 7 -20 34 19 0.41 - 22 0 0 -21 3 14 0 47 12.8 1 248 -66 -21 54 24 -20 12 18 -21 55 47 -20 10 56 0.50 - 21 0 0 -20 39 45 0 47 12.9 0 248 -67 -21 30 56 -19 48 47 -21 32 19 -19 47 25 1.03 Uncertainty in time = +/- 0 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: UCAC4 345-095342 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 16 29.9703 DE: -21 07 44.425 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 16 29.9702 DE: -21 07 44.425 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (76) Freia asteroid class: approx. diameter [km]: 167 approx. diameter ["]: 0.056 distance from Earth [AU]: 4.11100 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", 93.574° remarks: * orbital elements for (76)Freia : Mean anomaly = 176.8431413120 deg Arg. of pericenter = 251.9886013810 deg Long. of node = 204.2890188737 deg Inclination = 2.1228758154 deg Eccentricity = 0.1670305817 Semimajor axis = 3.4116962586 AU Perihelion dist = 2.8418386480 AU Mag: H = 8.09, G = 0.15 Epoch of elements : MJD 60215.02944444 TDT (2023 Sep 28.0294) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#762023Aug24,7.89,2023,9,28,0.706384,-0.028749,-0.272911,11.870987,-1.246613,0.005666,-0.000361,0.000000,0.000000 -117.6637,-21.1555,167.13,-1.85,False UCAC4 345-095342,17.27499177,-21.1290070,0.00,12.34,0.00,0.0,0,,17.29834824,-21.1555178,2.68,0.00,0,0,0 76,Freia,14.92,166.800,4.1110,0,0,1.815,-2.67,,8.4,0 0,176.6821,2023,9,27,251.9886,204.2890,2.1229,0.16703,3.41170,2.84184,8.05,5.0,0.15 1.013,0.0030,0.0007,94,0.0031,Known errors,-1.00,0,-1,-1 20230928_095342,60182.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:51 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org