IOTA/IOTA-ES occultation update for (34) Circe / UCAC4 375-107225 event on 2023 Jul 12, 16:52 UT Visible from Australia, Africa Summary ------- On 2023 Jul 12 UT, the 118.5 km diameter asteroid (34) Circe will occult a 11.4 mag star in the constellation Serpens for observers along a path across Australia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.65 mag to 12.82 mag (the magnitude of the asteroid) for at most 11.580 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 Jul 12, 16:42 - 2023 Jul 12, 17:02 * geocentric midpoint of event [JD]: 2460138.20298120 * magnitude of target star: 11.44 * magnitude drop [mag]: 1.65 * estimated maximum duration [s]: 11.580 * Moon: 24 % sunlit, 141° distance * Sun: 158° distance * rough path description: Australia, Africa The occultation path -------------------- * approximate projected width [km]: 123 * 1 sigma uncertainty interval [path widths]: +/- 0.15 * 1 sigma uncertainty interval [seconds]: +/- 3.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.023, +/- 0.013) * 1 sigma uncertainty ellipse (major, minor, PA): (0.023", 0.013", 89°) * approx speed of asteroid's shadow [km/s]: 10.2300 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 375-107225 by 34 Circe on 2023 Jul 12 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 - 12 0 0 -23 7 16 17 2 15.6 1 106 15 -22 32 33 -23 42 5 -22 22 13 -23 52 29 .... - 11 0 0 -23 23 24 17 2 15.3 2 106 14 -22 48 43 -23 58 12 -22 38 23 -24 8 36 0.26 - 10 0 0 -23 39 23 17 2 14.9 3 105 13 -23 4 43 -24 14 9 -22 54 23 -24 24 33 0.27 - 9 0 0 -23 55 11 17 2 14.4 4 105 12 -23 20 33 -24 29 56 -23 10 13 -24 40 19 0.27 - 8 0 0 -24 10 49 17 2 13.6 4 104 11 -23 36 12 -24 45 32 -23 25 53 -24 55 55 0.27 - 7 0 0 -24 26 17 17 2 12.7 5 104 10 -23 51 41 -25 0 59 -23 41 23 -25 11 21 0.28 - 6 0 0 -24 41 33 17 2 11.6 6 104 9 -24 6 59 -25 16 14 -23 56 41 -25 26 36 0.28 - 5 0 0 -24 56 39 17 2 10.3 7 103 8 -24 22 6 -25 31 18 -24 11 49 -25 41 40 0.28 - 4 0 0 -25 11 33 17 2 8.9 8 103 7 -24 37 2 -25 46 11 -24 26 45 -25 56 32 0.28 - 3 0 0 -25 26 16 17 2 7.3 9 102 6 -24 51 47 -26 0 52 -24 41 30 -26 11 13 0.28 - 2 0 0 -25 40 48 17 2 5.5 10 102 6 -25 6 19 -26 15 22 -24 56 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in time = +/- 3 secs Prediction of 2023 May 14.2 Data for the target star ------------------------ * name: UCAC4 375-107225 * constellation : Serpens * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 57 28.3171 DE: -15 03 00.962 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 57 28.3171 DE: -15 03 00.962 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.4 * 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]: 1.84800 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): 0.023", 0.013", 89.455° remarks: * orbital elements for (34)Circe : Mean anomaly = 111.5451851988 deg Arg. of pericenter = 329.9878946186 deg Long. of node = 184.3311549836 deg Inclination = 5.4973885610 deg Eccentricity = 0.1066228416 Semimajor axis = 2.6865773599 AU Perihelion dist = 2.4001268475 AU Mag: H = 8.68, G = 0.15 Epoch of elements : MJD 60137.70284722 TDT (2023 Jul 12.7028) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1032023Apr24,11.58,2023,7,12,16.871549,0.035823,-0.278817,-5.727043,-0.735727,0.001914,-0.000768,0.000001,0.000000 86.3081,-15.0531,-71.65,21.93,False UCAC4 375-107225,17.95786588,-15.0502672,0.00,11.44,0.00,0.0,0,,17.98052393,-15.0531258,1.65,0.00,0,0,0 34,Circe,12.82,118.5,1.8480,0,0,-1.880,-3.50,,5.8,0 0,111.3879,2023,7,12,329.9879,184.3312,5.4974,0.10662,2.68658,2.40013,8.69,5.0,0.15 1.149,0.0230,0.0130,89,0.0132,Known errors,-1.00,-1,-1,-1 20230712_107225,60078.17 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 14, 04:01 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org