IOTA/IOTA-ES occultation update for (34) Circe / UCAC4 376-121879 event on 2023 Jun 03, 07:29 UT Visible from South America Summary ------- On 2023 Jun 03 UT, the 118.5 km diameter asteroid (34) Circe will occult a 12.2 mag star in the constellation Scutum for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.13 mag to 12.85 mag (the magnitude of the asteroid) for at most 12.410 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 Jun 03, 07:18 - 2023 Jun 03, 07:40 * geocentric midpoint of event [JD]: 2460098.81239275 * magnitude of target star: 12.19 * magnitude drop [mag]: 1.13 * estimated maximum duration [s]: 12.410 * Moon: 99 % sunlit, 39° distance * Sun: 153° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 124 * 1 sigma uncertainty interval [path widths]: +/- 0.15 * 1 sigma uncertainty interval [seconds]: +/- 3.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.023, +/- 0.013) * 1 sigma uncertainty ellipse (major, minor, PA): (0.023", 0.013", 88°) * approx speed of asteroid's shadow [km/s]: 9.5466 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 376-121879 by 34 Circe on 2023 Jun 3 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 179 0 0 -11 5 9 7 40 28.5 0 105 -27 -10 30 26 -11 39 59 -10 20 23 -11 50 7 .... -180 0 0 -11 21 23 7 40 28.3 1 105 -28 -10 46 38 -11 56 13 -10 36 34 -12 6 21 0.26 -179 0 0 -11 37 42 7 40 27.8 3 105 -29 -11 2 57 -12 12 34 -10 52 53 -12 22 42 0.28 -178 0 0 -11 54 7 7 40 27.2 4 105 -30 -11 19 21 -12 29 0 -11 9 17 -12 39 9 0.28 -177 0 0 -12 10 38 7 40 26.3 5 104 -31 -11 35 51 -12 45 32 -11 25 46 -12 55 41 0.29 -176 0 0 -12 27 14 7 40 25.2 6 104 -32 -11 52 26 -13 2 9 -11 42 21 -13 12 18 0.29 -175 0 0 -12 43 55 7 40 23.9 7 104 -33 -12 9 6 -13 18 50 -11 59 1 -13 29 0 0.29 -174 0 0 -13 0 40 7 40 22.4 8 104 -34 -12 25 50 -13 35 36 -12 15 45 -13 45 46 0.29 -173 0 0 -13 17 29 7 40 20.7 9 103 -35 -12 42 39 -13 52 26 -12 32 33 -14 2 36 0.29 -172 0 0 -13 34 22 7 40 18.7 10 103 -36 -12 59 31 -14 9 19 -12 49 25 -14 19 29 0.29 -171 0 0 -13 51 18 7 40 16.6 11 103 -37 -13 16 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-26 10 50 7 19 31.9 13 260 6 -25 36 16 -26 45 30 -25 26 15 -26 55 35 0.32 0 0 0 -25 56 50 7 19 29.4 12 259 7 -25 22 15 -26 31 32 -25 12 14 -26 41 37 0.32 1 0 0 -25 42 40 7 19 27.1 11 259 8 -25 8 3 -26 17 23 -24 58 2 -26 27 29 0.32 2 0 0 -25 28 19 7 19 24.9 10 258 9 -24 53 41 -26 3 3 -24 43 39 -26 13 9 0.32 3 0 0 -25 13 47 7 19 22.9 10 258 10 -24 39 8 -25 48 33 -24 29 5 -25 58 40 0.32 4 0 0 -24 59 5 7 19 21.1 9 257 11 -24 24 24 -25 33 52 -24 14 22 -25 43 59 0.33 5 0 0 -24 44 13 7 19 19.5 8 257 12 -24 9 31 -25 19 1 -23 59 28 -25 29 9 0.33 6 0 0 -24 29 11 7 19 18.1 7 257 13 -23 54 27 -25 4 0 -23 44 24 -25 14 8 0.34 7 0 0 -24 13 59 7 19 16.8 6 256 13 -23 39 14 -24 48 50 -23 29 10 -24 58 58 0.34 8 0 0 -23 58 37 7 19 15.7 5 256 14 -23 23 52 -24 33 29 -23 13 47 -24 43 38 0.35 9 0 0 -23 43 7 7 19 14.8 4 255 15 -23 8 20 -24 18 0 -22 58 15 -24 28 9 0.36 10 0 0 -23 27 27 7 19 14.1 3 255 16 -22 52 39 -24 2 21 -22 42 34 -24 12 31 0.38 11 0 0 -23 11 38 7 19 13.6 2 255 17 -22 36 49 -23 46 34 -22 26 44 -23 56 43 0.42 12 0 0 -22 55 41 7 19 13.2 1 254 18 -22 20 51 -23 30 38 -22 10 46 -23 40 48 0.53 13 0 0 -22 39 36 7 19 13.1 0 254 19 .. .. .. -23 14 34 .. .. .. -23 24 44 2.39 Uncertainty in time = +/- 3 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 376-121879 * constellation : Scutum * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 31 00.7877 DE: -14 56 06.514 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 31 00.7878 DE: -14 56 06.514 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (34) Circe asteroid class: approx. diameter [km]: 119 approx. diameter ["]: 0.089 distance from Earth [AU]: 1.83350 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", 88.017° remarks: * orbital elements for (34)Circe : Mean anomaly = 102.7074454727 deg Arg. of pericenter = 330.0084628251 deg Long. of node = 184.3312182947 deg Inclination = 5.4973885449 deg Eccentricity = 0.1066132502 Semimajor axis = 2.6866803177 AU Perihelion dist = 2.4002445968 AU Mag: H = 8.68, G = 0.15 Epoch of elements : MJD 60098.31222222 TDT (2023 Jun 03.3122) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1032023Apr24,12.41,2023,6,3,7.497426,-0.031172,-0.295540,-5.358632,0.565189,-0.002324,-0.000854,0.000001,0.000000 -85.8719,-14.9194,67.07,22.29,False UCAC4 376-121879,18.51688548,-14.9351429,0.00,12.19,0.00,0.0,0,,18.53935008,-14.9193874,1.13,0.00,0,0,0 34,Circe,12.85,118.5,1.8335,0,0,-1.773,2.71,,5.8,0 0,102.6376,2023,6,3,330.0085,184.3312,5.4974,0.10661,2.68668,2.40024,8.69,5.0,0.15 1.145,0.0227,0.0127,88,0.0129,Known errors,-1.00,-1,-1,-1 20230603_121879,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org