IOTA/IOTA-ES occultation update for (34) Circe / UCAC4 373-141518 event on 2023 May 16, 16:35 UT Visible from New Zealand, Australia Summary ------- On 2023 May 16 UT, the 118.5 km diameter asteroid (34) Circe will occult a 12.3 mag star in the constellation Scutum for observers along a path across New Zealand, Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.27 mag to 13.18 mag (the magnitude of the asteroid) for at most 24.440 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 16, 16:14 - 2023 May 16, 16:57 * geocentric midpoint of event [JD]: 2460081.19165400 * magnitude of target star: 12.32 * magnitude drop [mag]: 1.27 * estimated maximum duration [s]: 24.440 * Moon: 10 % sunlit, 98° distance * Sun: 135° distance * rough path description: New Zealand, Australia The occultation path -------------------- * approximate projected width [km]: 125 * 1 sigma uncertainty interval [path widths]: +/- 0.17 * 1 sigma uncertainty interval [seconds]: +/- 5.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.021, +/- 0.012) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.012", 88°) * approx speed of asteroid's shadow [km/s]: 4.8494 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 373-141518 by 34 Circe on 2023 May 16 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 6 30 3 16 56 43.1 0 106 -42 7 4 58 5 55 2 .. .. .. 5 42 59 .... 65 0 0 6 13 5 16 56 42.8 1 106 -43 6 48 4 5 38 0 7 0 2 5 25 55 0.26 66 0 0 5 55 38 16 56 42.0 2 106 -44 6 30 40 5 20 28 6 42 41 5 8 22 0.29 67 0 0 5 37 41 16 56 40.8 3 106 -45 6 12 48 5 2 27 6 24 49 4 50 19 0.29 68 0 0 5 19 14 16 56 39.2 4 106 -46 5 54 26 4 43 56 6 6 29 4 31 47 0.30 69 0 0 5 0 19 16 56 37.1 5 106 -47 5 35 35 4 24 56 5 47 39 4 12 46 0.30 70 0 0 4 40 55 16 56 34.6 6 106 -48 5 16 15 4 5 28 5 28 21 3 53 16 0.30 71 0 0 4 21 3 16 56 31.5 7 106 -49 4 56 28 3 45 31 5 8 35 3 33 18 0.30 72 0 0 4 0 43 16 56 28.1 8 106 -50 4 36 12 3 25 7 4 48 21 3 12 52 0.30 73 0 0 3 39 56 16 56 24.2 9 106 -51 4 15 29 3 4 15 4 27 40 2 51 58 0.30 74 0 0 3 18 41 16 56 19.8 11 106 -52 3 54 19 2 42 55 4 6 32 2 30 37 0.30 75 0 0 2 56 59 16 56 15.0 12 106 -53 3 32 42 2 21 9 3 44 56 2 8 49 0.30 76 0 0 2 34 51 16 56 9.7 13 106 -54 3 10 39 1 58 56 3 22 55 1 46 35 0.30 77 0 0 2 12 17 16 56 3.9 14 106 -55 2 48 10 1 36 17 3 0 27 1 23 54 0.30 78 0 0 1 49 18 16 55 57.7 15 106 -56 2 25 15 1 13 13 2 37 34 1 0 48 0.30 79 0 0 1 25 53 16 55 51.1 16 106 -57 2 1 55 0 49 44 2 14 15 0 37 17 0.30 80 0 0 1 2 4 16 55 44.0 17 106 -58 1 38 10 0 25 49 1 50 32 0 13 21 0.30 81 0 0 0 37 50 16 55 36.5 18 106 -59 1 14 2 0 1 31 1 26 25 - 0 10 59 0.30 82 0 0 0 13 13 16 55 28.5 19 106 -60 0 49 29 - 0 23 11 1 1 54 - 0 35 43 0.30 83 0 0 - 0 11 48 16 55 20.0 20 106 -61 0 24 33 - 0 48 17 0 37 0 - 1 0 50 0.30 84 0 0 - 0 37 12 16 55 11.2 21 106 -62 - 0 0 46 - 1 13 45 0 11 43 - 1 26 20 0.30 85 0 0 - 1 2 57 16 55 1.8 22 106 -63 - 0 26 27 - 1 39 36 - 0 13 56 - 1 52 12 0.30 86 0 0 - 1 29 5 16 54 52.1 23 106 -64 - 0 52 29 - 2 5 48 - 0 39 58 - 2 18 26 0.30 87 0 0 - 1 55 33 16 54 41.9 24 106 -65 - 1 18 53 - 2 32 21 - 1 6 20 - 2 45 1 0.30 88 0 0 - 2 22 22 16 54 31.3 25 106 -66 - 1 45 38 - 2 59 15 - 1 33 3 - 3 11 56 0.30 89 0 0 - 2 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28 16 15 26.1 7 255 18 -44 22 21 -45 32 43 -44 10 19 -45 44 50 0.35 -101 0 0 -44 44 9 16 15 24.1 6 254 18 -44 8 56 -45 19 28 -43 56 53 -45 31 37 0.36 -100 0 0 -44 30 23 16 15 22.2 5 254 19 -43 55 6 -45 5 48 -43 43 1 -45 17 59 0.36 - 99 0 0 -44 16 12 16 15 20.6 5 253 19 -43 40 50 -44 51 42 -43 28 43 -45 3 55 0.37 - 98 0 0 -44 1 35 16 15 19.2 4 252 20 -43 26 7 -44 37 10 -43 13 59 -44 49 25 0.38 - 97 0 0 -43 46 32 16 15 18.1 3 252 21 -43 10 58 -44 22 12 -42 58 48 -44 34 29 0.39 - 96 0 0 -43 31 2 16 15 17.2 2 251 21 -42 55 23 -44 6 48 -42 43 11 -44 19 6 0.42 - 95 0 0 -43 15 5 16 15 16.5 2 250 22 -42 39 20 -43 50 57 -42 27 6 -44 3 17 0.47 - 94 0 0 -42 58 41 16 15 16.1 1 250 22 -42 22 51 -43 34 39 -42 10 35 -43 47 1 0.61 - 93 0 0 -42 41 50 16 15 15.9 0 249 23 .. .. .. -43 17 53 .. .. .. -43 30 18 5.86 Uncertainty in time = +/- 6 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 373-141518 * constellation : Scutum * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 40 10.3257 DE: -15 25 06.811 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 40 10.3258 DE: -15 25 06.811 * 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: (34) Circe asteroid class: approx. diameter [km]: 119 approx. diameter ["]: 0.084 distance from Earth [AU]: 1.95050 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): 0.021", 0.012", 87.529° remarks: * orbital elements for (34)Circe : Mean anomaly = 98.7558752468 deg Arg. of pericenter = 330.0161030435 deg Long. of node = 184.3312769654 deg Inclination = 5.4973893445 deg Eccentricity = 0.1066102807 Semimajor axis = 2.6867188416 AU Perihelion dist = 2.4002869918 AU Mag: H = 8.68, G = 0.15 Epoch of elements : MJD 60080.69138889 TDT (2023 May 16.6914) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1032023Apr24,24.44,2023,5,16,16.599696,-0.139428,-0.291157,-2.468554,1.182427,-0.003915,-0.000819,0.000001,0.000000 157.2508,-15.3980,-69.90,19.15,False UCAC4 373-141518,18.66953491,-15.4185587,0.00,12.32,0.00,0.0,0,,18.69193587,-15.3980191,1.26,0.00,0,0,0 34,Circe,13.18,118.5,1.9505,0,0,-0.770,5.33,,5.8,0 0,98.6011,2023,5,16,330.0161,184.3313,5.4974,0.10661,2.68672,2.40029,8.69,5.0,0.15 1.172,0.0207,0.0120,88,0.0144,Known errors,-1.00,-1,-1,-1 20230516_141518,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:27 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org