IOTA/IOTA-ES occultation update for (34) Circe / UCAC4 375-131159 event on 2023 May 29, 15:54 UT Visible from Australia Summary ------- On 2023 May 29 UT, the 118.5 km diameter asteroid (34) Circe will occult a 10.8 mag star in the constellation Scutum 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 2.30 mag to 12.94 mag (the magnitude of the asteroid) for at most 13.980 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 May 29, 15:41 - 2023 May 29, 16:06 * geocentric midpoint of event [JD]: 2460094.16273308 * magnitude of target star: 10.78 * magnitude drop [mag]: 2.30 * estimated maximum duration [s]: 13.980 * Moon: 70 % sunlit, 97° distance * Sun: 148° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 123 * 1 sigma uncertainty interval [path widths]: +/- 0.15 * 1 sigma uncertainty interval [seconds]: +/- 3.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.022, +/- 0.013) * 1 sigma uncertainty ellipse (major, minor, PA): (0.022", 0.013", 88°) * approx speed of asteroid's shadow [km/s]: 8.4736 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 375-131159 by 34 Circe on 2023 May 29 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 59 0 0 - 6 54 56 16 6 24.4 0 105 -32 - 6 20 30 - 7 29 28 - 6 10 13 - 7 39 49 .... 60 0 0 - 7 11 18 16 6 24.2 2 105 -33 - 6 36 51 - 7 45 52 - 6 26 34 - 7 56 13 0.24 61 0 0 - 7 27 50 16 6 23.7 3 105 -34 - 6 53 21 - 8 2 25 - 6 43 4 - 8 12 47 0.25 62 0 0 - 7 44 31 16 6 22.9 4 105 -35 - 7 10 1 - 8 19 8 - 6 59 43 - 8 29 29 0.26 63 0 0 - 8 1 21 16 6 21.9 5 105 -36 - 7 26 49 - 8 35 59 - 7 16 31 - 8 46 21 0.26 64 0 0 - 8 18 20 16 6 20.7 6 104 -37 - 7 43 46 - 8 52 59 - 7 33 28 - 9 3 21 0.26 65 0 0 - 8 35 26 16 6 19.2 7 104 -38 - 8 0 51 - 9 10 6 - 7 50 32 - 9 20 29 0.26 66 0 0 - 8 52 40 16 6 17.4 8 104 -39 - 8 18 4 - 9 27 21 - 8 7 45 - 9 37 45 0.26 67 0 0 - 9 10 1 16 6 15.5 9 104 -40 - 8 35 24 - 9 44 44 - 8 25 5 - 9 55 7 0.26 68 0 0 - 9 27 29 16 6 13.2 10 104 -41 - 8 52 51 -10 2 13 - 8 42 31 -10 12 37 0.26 69 0 0 - 9 45 4 16 6 10.8 11 104 -42 - 9 10 25 -10 19 49 - 9 0 4 -10 30 13 0.26 70 0 0 -10 2 45 16 6 8.1 12 103 -43 - 9 28 4 -10 37 31 - 9 17 44 -10 47 55 0.26 71 0 0 -10 20 31 16 6 5.1 13 103 -44 - 9 45 50 -10 55 18 - 9 35 29 -11 5 43 0.26 72 0 0 -10 38 23 16 6 1.9 14 103 -45 -10 3 41 -11 13 11 - 9 53 19 -11 23 36 0.26 73 0 0 -10 56 20 16 5 58.5 15 103 -46 -10 21 36 -11 31 9 -10 11 15 -11 41 34 0.26 74 0 0 -11 14 21 16 5 54.9 16 103 -47 -10 39 37 -11 49 11 -10 29 15 -11 59 36 0.26 75 0 0 -11 32 26 16 5 51.0 17 102 -48 -10 57 41 -12 7 17 -10 47 19 -12 17 43 0.27 76 0 0 -11 50 35 16 5 46.9 18 102 -49 -11 15 50 -12 25 27 -11 5 27 -12 35 53 0.27 77 0 0 -12 8 48 16 5 42.6 19 102 -50 -11 34 1 -12 43 40 -11 23 39 -12 54 7 0.27 78 0 0 -12 27 3 16 5 38.0 20 102 -51 -11 52 16 -13 1 56 -11 41 54 -13 12 23 0.27 79 0 0 -12 45 21 16 5 33.3 21 101 -52 -12 10 34 -13 20 15 -12 0 11 -13 30 42 0.27 80 0 0 -13 3 41 16 5 28.3 22 101 -53 -12 28 53 -13 38 36 -12 18 30 -13 49 3 0.27 81 0 0 -13 22 3 16 5 23.1 23 101 -54 -12 47 15 -13 56 58 -12 36 52 -14 7 25 0.27 82 0 0 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21 -23 47 21 -24 56 34 -23 37 2 -25 6 57 0.38 -108 0 0 -24 5 56 15 42 16.2 1 254 22 -23 31 21 -24 40 37 -23 21 1 -24 51 0 0.48 -107 0 0 -23 49 46 15 42 16.1 0 254 23 .. .. .. -24 24 28 .. .. .. -24 34 52 2.13 Uncertainty in time = +/- 4 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 375-131159 * constellation : Scutum * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 34 06.1463 DE: -15 01 57.123 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 34 06.1463 DE: -15 01 57.123 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.500,0.400) * V mag [mag]: 10.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (34) Circe asteroid class: approx. diameter [km]: 119 approx. diameter ["]: 0.088 distance from Earth [AU]: 1.85800 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#103 date of fit: 2023 Apr 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): 0.022", 0.013", 87.868° remarks: * orbital elements for (34)Circe : Mean anomaly = 101.6645775103 deg Arg. of pericenter = 330.0106026516 deg Long. of node = 184.3312251572 deg Inclination = 5.4973886179 deg Eccentricity = 0.1066124585 Semimajor axis = 2.6866910180 AU Perihelion dist = 2.4002562834 AU Mag: H = 8.68, G = 0.15 Epoch of elements : MJD 60093.66250000 TDT (2023 May 29.6625) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1032023Apr24,13.98,2023,5,29,15.905594,-0.041390,-0.268312,-4.726718,0.729817,-0.002761,-0.000856,0.000001,0.000000 153.3606,-15.0152,-59.22,21.65,False UCAC4 375-131159,18.56837396,-15.0325343,0.00,10.78,0.00,0.0,4,,18.59082257,-15.0151635,2.30,0.00,0,0,0 34,Circe,12.94,118.5,1.8580,0,0,-1.545,3.45,,5.8,0 0,101.5163,2023,5,29,330.0106,184.3312,5.4974,0.10661,2.68669,2.40026,8.69,5.0,0.15 1.149,0.0223,0.0127,88,0.0131,Known errors,-1.00,-1,-1,-1 20230529_131159,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:32 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org