IOTA/IOTA-ES occultation update for (34) Circe / UCAC4 359-139739 event on 2023 Oct 11, 17:29 UT Visible from S Africa Summary ------- On 2023 Oct 11 UT, the 118.5 km diameter asteroid (34) Circe will occult a 11.6 mag star in the constellation Sagittarius for observers along a path across S Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.80 mag to 14.31 mag (the magnitude of the asteroid) for at most 5.040 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 11, 17:25 - 2023 Oct 11, 17:34 * geocentric midpoint of event [JD]: 2460229.22889588 * magnitude of target star: 11.60 * magnitude drop [mag]: 2.80 * estimated maximum duration [s]: 5.040 * Moon: 9 % sunlit, 111° distance * Sun: 77° distance * rough path description: S Africa The occultation path -------------------- * approximate projected width [km]: 120 * 1 sigma uncertainty interval [path widths]: +/- 0.02 * 1 sigma uncertainty interval [seconds]: +/- 0.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.005, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.005", 0.001", 88°) * approx speed of asteroid's shadow [km/s]: 23.5098 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 359-139739 by 34 Circe on 2023 Oct 11 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 - 97 0 0 - 6 13 4 17 25 9.9 1 108 78 - 6 47 36 - 5 38 36 - 6 48 38 - 5 37 34 .... - 96 0 0 - 6 33 9 17 25 10.0 2 108 79 - 7 7 42 - 5 58 40 - 7 8 44 - 5 57 38 0.20 - 95 0 0 - 6 53 19 17 25 10.2 3 108 80 - 7 27 53 - 6 18 49 - 7 28 56 - 6 17 47 0.20 - 94 0 0 - 7 13 34 17 25 10.5 4 108 81 - 7 48 9 - 6 39 3 - 7 49 12 - 6 38 1 0.19 - 93 0 0 - 7 33 54 17 25 10.9 5 108 82 - 8 8 30 - 6 59 22 - 8 9 32 - 6 58 20 0.19 - 92 0 0 - 7 54 17 17 25 11.4 6 108 83 - 8 28 53 - 7 19 44 - 8 29 56 - 7 18 42 0.19 - 91 0 0 - 8 14 43 17 25 12.0 7 108 84 - 8 49 21 - 7 40 10 - 8 50 23 - 7 39 8 0.19 - 90 0 0 - 8 35 13 17 25 12.7 8 107 84 - 9 9 51 - 8 0 39 - 9 10 53 - 7 59 36 0.19 - 89 0 0 - 8 55 44 17 25 13.5 9 107 85 - 9 30 23 - 8 21 10 - 9 31 26 - 8 20 8 0.19 - 88 0 0 - 9 16 18 17 25 14.3 10 107 86 - 9 50 57 - 8 41 43 - 9 52 0 - 8 40 41 0.19 - 87 0 0 - 9 36 53 17 25 15.3 11 107 87 -10 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-14 30 43 0.25 84 0 0 -14 46 31 17 34 3.2 3 252 -66 -15 21 6 -14 12 1 -15 22 8 -14 10 59 0.27 85 0 0 -14 26 42 17 34 3.4 2 252 -67 -15 1 17 -13 52 11 -15 2 19 -13 51 8 0.32 86 0 0 -14 6 47 17 34 3.5 1 251 -68 -14 41 23 -13 32 15 -14 42 25 -13 31 13 0.55 Uncertainty in time = +/- 0 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: UCAC4 359-139739 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 20 33.6799 DE: -18 17 15.947 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 20 33.6799 DE: -18 17 15.947 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.300) * V mag [mag]: 11.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (34) Circe asteroid class: approx. diameter [km]: 119 approx. diameter ["]: 0.055 distance from Earth [AU]: 2.94680 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#106 date of fit: 2023 Aug 23 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): 0.005", 0.001", 88.372° remarks: * orbital elements for (34)Circe : Mean anomaly = 131.9796002746 deg Arg. of pericenter = 329.9317163461 deg Long. of node = 184.3306836778 deg Inclination = 5.4974043648 deg Eccentricity = 0.1066815474 Semimajor axis = 2.6862675410 AU Perihelion dist = 2.3996923630 AU Mag: H = 8.80, G = 0.15 Epoch of elements : MJD 60228.72895833 TDT (2023 Oct 11.7290) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1062023Aug23,5.04,2023,10,11,17.493501,-0.013539,-0.180021,13.234349,-0.966474,0.005670,0.000328,0.000000,0.000000 -6.9637,-18.2776,-85.71,-7.11,False UCAC4 359-139739,18.34268889,-18.2877631,0.00,11.60,0.00,0.0,4,,18.36565369,-18.2775877,2.80,0.00,0,0,0 34,Circe,14.31,118.500,2.9468,0,0,2.773,-2.88,,5.8,0 0,131.8164,2023,10,11,329.9317,184.3307,5.4974,0.10668,2.68627,2.39969,8.67,5.0,0.15 1.015,0.0053,0.0006,88,0.0054,Known errors,-1.00,0,-1,-1 20231011_139739,60183.00 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:57 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org