IOTA/IOTA-ES occultation update for (34) Circe / UCAC4 362-140154 event on 2023 Mar 27, 19:07 UT Visible from Australia Summary ------- On 2023 Mar 27 UT, the 118.5 km diameter asteroid (34) Circe will occult a 11.8 mag star in the constellation Sagittarius 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 2.21 mag to 13.89 mag (the magnitude of the asteroid) for at most 7.270 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: 2023 Mar 27, 19:00 - 2023 Mar 27, 19:13 * geocentric midpoint of event [JD]: 2460031.29660880 * magnitude of target star: 11.83 * magnitude drop [mag]: 2.21 * estimated maximum duration [s]: 7.270 * Moon: 37 % sunlit, 163° distance * Sun: 91° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 129 * 1 sigma uncertainty interval [path widths]: +/- 0.15 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.009) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.009", 88°) * approx speed of asteroid's shadow [km/s]: 16.3067 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 362-140154 by 34 Circe on 2023 Mar 27 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 64 0 0 -34 4 52 19 1 8.0 0 111 -57 -34 42 35 .. .. .. -34 53 44 .. .. .. .... 65 0 0 -34 24 23 19 1 8.1 1 111 -57 -35 2 5 -33 46 54 -35 13 12 -33 35 53 0.39 66 0 0 -34 43 40 19 1 8.3 2 110 -57 -35 21 18 -34 6 13 -35 32 25 -33 55 14 0.41 67 0 0 -35 2 42 19 1 8.5 3 110 -57 -35 40 17 -34 25 18 -35 51 23 -34 14 19 0.42 68 0 0 -35 21 28 19 1 8.9 4 109 -57 -35 59 0 -34 44 7 -36 10 5 -34 33 9 0.42 69 0 0 -35 39 58 19 1 9.4 5 108 -56 -36 17 27 -35 2 40 -36 28 31 -34 51 43 0.42 70 0 0 -35 58 12 19 1 10.0 5 108 -56 -36 35 38 -35 20 57 -36 46 41 -35 10 2 0.43 71 0 0 -36 16 10 19 1 10.7 6 107 -56 -36 53 32 -35 38 58 -37 4 34 -35 28 4 0.43 72 0 0 -36 33 51 19 1 11.4 7 107 -56 -37 11 10 -35 56 43 -37 22 11 -35 45 49 0.43 73 0 0 -36 51 15 19 1 12.3 8 106 -56 -37 28 31 -36 14 11 -37 39 31 -36 3 18 0.43 74 0 0 -37 8 23 19 1 13.2 9 106 -56 -37 45 35 -36 31 22 -37 56 34 -36 20 30 0.43 75 0 0 -37 25 13 19 1 14.2 10 105 -55 -38 2 22 -36 48 15 -38 13 20 -36 37 25 0.43 76 0 0 -37 41 47 19 1 15.3 11 104 -55 -38 18 52 -37 4 52 -38 29 49 -36 54 2 0.43 77 0 0 -37 58 2 19 1 16.5 11 104 -55 -38 35 4 -37 21 11 -38 46 0 -37 10 22 0.43 78 0 0 -38 14 0 19 1 17.8 12 103 -55 -38 50 59 -37 37 13 -39 1 54 -37 26 25 0.43 79 0 0 -38 29 41 19 1 19.2 13 102 -54 -39 6 35 -37 52 57 -39 17 30 -37 42 10 0.43 80 0 0 -38 45 4 19 1 20.6 14 102 -54 -39 21 55 -38 8 23 -39 32 47 -37 57 37 0.43 81 0 0 -39 0 8 19 1 22.2 15 101 -54 -39 36 56 -38 23 31 -39 47 47 -38 12 47 0.43 82 0 0 -39 14 55 19 1 23.8 16 100 -53 -39 51 39 -38 38 22 -40 2 29 -38 27 38 0.43 83 0 0 -39 29 23 19 1 25.4 16 100 -53 -40 6 3 -38 52 54 -40 16 53 -38 42 11 0.43 84 0 0 -39 43 34 19 1 27.2 17 99 -52 -40 20 10 -39 7 7 -40 30 59 -38 56 26 0.43 85 0 0 -39 57 26 19 1 29.0 18 98 -52 -40 33 58 -39 21 3 -40 44 46 -39 10 22 0.43 86 0 0 -40 10 59 19 1 30.9 19 98 -52 -40 47 28 -39 34 40 -40 58 15 -39 24 0 0.43 87 0 0 -40 24 14 19 1 32.8 20 97 -51 -41 0 40 -39 47 59 -41 11 25 -39 37 20 0.43 88 0 0 -40 37 11 19 1 34.9 20 96 -51 -41 13 33 -40 0 59 -41 24 17 -39 50 21 0.43 89 0 0 -40 49 49 19 1 37.0 21 96 -50 -41 26 7 -40 13 40 -41 36 51 -40 3 4 0.43 90 0 0 -41 2 8 19 1 39.1 22 95 -50 -41 38 23 -40 26 3 -41 49 5 -40 15 27 0.43 91 0 0 -41 14 9 19 1 41.3 23 94 -49 -41 50 20 -40 38 7 -42 1 2 -40 27 33 0.43 92 0 0 -41 25 51 19 1 43.6 23 93 -49 -42 1 59 -40 49 53 -42 12 39 -40 39 19 0.43 93 0 0 -41 37 14 19 1 46.0 24 93 -48 -42 13 19 -41 1 19 -42 23 58 -40 50 47 0.43 94 0 0 -41 48 19 19 1 48.4 25 92 -48 -42 24 20 -41 12 27 -42 34 59 -41 1 55 0.43 95 0 0 -41 59 5 19 1 50.9 26 91 -47 -42 35 3 -41 23 16 -42 45 40 -41 12 46 0.43 96 0 0 -42 9 32 19 1 53.4 26 91 -47 -42 45 27 -41 33 47 -42 56 3 -41 23 17 0.43 97 0 0 -42 19 40 19 1 56.0 27 90 -46 -42 55 32 -41 43 58 -43 6 7 -41 33 29 0.43 98 0 0 -42 29 30 19 1 58.6 28 89 -46 -43 5 18 -41 53 51 -43 15 53 -41 43 23 0.43 99 0 0 -42 39 1 19 2 1.3 29 88 -45 -43 14 46 -42 3 25 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-14 17 40 -13 2 40 -14 28 46 -12 51 41 0.47 -113 0 0 -13 18 6 19 13 0.8 10 254 73 -13 55 38 -12 40 45 -14 6 44 -12 29 47 0.47 -112 0 0 -12 56 22 19 13 2.0 9 254 74 -13 33 51 -12 19 4 -13 44 55 -12 8 7 0.48 -111 0 0 -12 34 52 19 13 3.1 8 253 74 -13 12 18 -11 57 38 -13 23 21 -11 46 42 0.48 -110 0 0 -12 13 37 19 13 4.1 7 253 75 -12 50 59 -11 36 26 -13 2 2 -11 25 32 0.49 -109 0 0 -11 52 38 19 13 4.9 6 253 75 -12 29 57 -11 15 31 -12 40 58 -11 4 37 0.50 -108 0 0 -11 31 55 19 13 5.6 5 253 76 -12 9 9 -10 54 51 -12 20 10 -10 43 58 0.52 -107 0 0 -11 11 27 19 13 6.1 3 253 76 -11 48 39 -10 34 27 -11 59 38 -10 23 35 0.54 -106 0 0 -10 51 17 19 13 6.5 2 252 76 -11 28 25 -10 14 20 -11 39 23 -10 3 29 0.58 -105 0 0 -10 31 23 19 13 6.8 1 252 77 -11 8 28 - 9 54 30 -11 19 25 - 9 43 40 0.69 -104 0 0 -10 11 47 19 13 6.9 0 252 77 -10 48 48 - 9 34 58 -10 59 44 - 9 24 9 1.37 Uncertainty in time = +/- 2 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: UCAC4 362-140154 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 24 06.0997 DE: -17 44 19.584 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 24 06.1000 DE: -17 44 19.584 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (34) Circe asteroid class: approx. diameter [km]: 119 approx. diameter ["]: 0.065 distance from Earth [AU]: 2.50110 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#102 date of fit: 2023 Feb 09 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): 0.016", 0.009", 87.975° remarks: * orbital elements for (34)Circe : Mean anomaly = 87.5713286684 deg Arg. of pericenter = 330.0343352826 deg Long. of node = 184.3318909109 deg Inclination = 5.4974057004 deg Eccentricity = 0.1065974619 Semimajor axis = 2.6868135851 AU Perihelion dist = 2.4004060764 AU Mag: H = 8.69, G = 0.15 Epoch of elements : MJD 60030.79666667 TDT (2023 Mar 27.7967) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1022023Feb09,7.27,2023,3,27,19.118611,0.085169,-0.383410,8.981993,2.009241,-0.005748,-0.000267,0.000000,0.000000 164.6282,-17.7277,-105.44,2.72,False UCAC4 362-140154,18.40169434,-17.7387733,0.00,11.83,0.00,0.0,0,,18.42409353,-17.7276746,2.21,0.00,0,0,0 34,Circe,13.89,118.5,2.5011,0,0,2.211,7.07,,5.8,0 0,87.3930,2023,3,27,330.0343,184.3319,5.4974,0.10660,2.68681,2.40041,8.69,5.0,0.15 1.147,0.0157,0.0093,88,0.0096,Known errors,-1.00,-1,-1,-1 20230327_140154,59990.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org