IOTA/IOTA-ES occultation update for (34) Circe / TYC 6249-00229-1 event on 2023 Jul 21, 09:12 UT Visible from New Zealand Summary ------- On 2023 Jul 21 UT, the 118.5 km diameter asteroid (34) Circe will occult a 11.8 mag star in the constellation Serpens for observers along a path across New Zealand. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.53 mag to 13.00 mag (the magnitude of the asteroid) for at most 14.260 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 21, 09:00 - 2023 Jul 21, 09:24 * geocentric midpoint of event [JD]: 2460146.88391216 * magnitude of target star: 11.78 * magnitude drop [mag]: 1.53 * estimated maximum duration [s]: 14.260 * Moon: 12 % sunlit, 109° distance * Sun: 149° distance * rough path description: New Zealand The occultation path -------------------- * approximate projected width [km]: 132 * 1 sigma uncertainty interval [path widths]: +/- 0.15 * 1 sigma uncertainty interval [seconds]: +/- 3.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.022, +/- 0.013) * 1 sigma uncertainty ellipse (major, minor, PA): (0.022", 0.013", 90°) * approx speed of asteroid's shadow [km/s]: 8.3114 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6249-00229-1 by 34 Circe on 2023 Jul 21 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 87 0 0 -36 43 25 9 24 19.8 0 109 18 -36 6 2 -37 21 1 -35 54 34 -37 32 37 .... 88 0 0 -37 0 0 9 24 19.7 1 108 17 -36 22 40 -37 37 33 -36 11 12 -37 49 9 0.40 89 0 0 -37 16 21 9 24 19.3 2 108 17 -36 39 3 -37 53 51 -36 27 36 -38 5 26 0.43 90 0 0 -37 32 26 9 24 18.8 3 107 16 -36 55 10 -38 9 54 -36 43 45 -38 21 28 0.44 91 0 0 -37 48 16 9 24 18.0 4 106 15 -37 11 3 -38 25 41 -36 59 38 -38 37 14 0.45 92 0 0 -38 3 51 9 24 17.1 4 106 14 -37 26 40 -38 41 13 -37 15 16 -38 52 46 0.45 93 0 0 -38 19 10 9 24 16.1 5 105 13 -37 42 2 -38 56 29 -37 30 39 -39 8 1 0.46 94 0 0 -38 34 13 9 24 14.8 6 105 13 -37 57 8 -39 11 30 -37 45 46 -39 23 1 0.46 95 0 0 -38 49 1 9 24 13.5 7 104 12 -38 11 59 -39 26 15 -38 0 37 -39 37 45 0.46 96 0 0 -39 3 33 9 24 11.9 8 103 11 -38 26 34 -39 40 45 -38 15 13 -39 52 14 0.46 97 0 0 -39 17 49 9 24 10.2 9 103 10 -38 40 53 -39 54 58 -38 29 33 -40 6 27 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-14 26 57 -16 4 8 0.52 - 78 0 0 -14 57 24 9 1 24.1 6 256 -37 -14 20 23 -15 34 36 -14 9 2 -15 46 6 0.53 - 77 0 0 -14 39 38 9 1 22.7 5 255 -36 -14 2 39 -15 16 48 -13 51 18 -15 28 17 0.54 - 76 0 0 -14 22 4 9 1 21.6 4 255 -35 -13 45 8 -14 59 12 -13 33 48 -15 10 41 0.56 - 75 0 0 -14 4 45 9 1 20.7 3 255 -34 -13 27 51 -14 41 50 -13 16 32 -14 53 18 0.60 - 74 0 0 -13 47 40 9 1 20.1 2 255 -33 -13 10 48 -14 24 43 -12 59 30 -14 36 9 0.67 - 73 0 0 -13 30 49 9 1 19.8 1 254 -32 -12 54 0 -14 7 49 -12 42 42 -14 19 15 0.94 Uncertainty in time = +/- 4 secs Prediction of 2023 May 29.0 Data for the target star ------------------------ * name: TYC 6249-00229-1 * constellation : Serpens * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 51 37.7798 DE: -15 16 50.150 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 51 37.7798 DE: -15 16 50.150 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (34) Circe asteroid class: approx. diameter [km]: 119 approx. diameter ["]: 0.086 distance from Earth [AU]: 1.90530 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", 89.715° remarks: * orbital elements for (34)Circe : Mean anomaly = 113.4933608678 deg Arg. of pericenter = 329.9829617500 deg Long. of node = 184.3311612916 deg Inclination = 5.4973885215 deg Eccentricity = 0.1066254395 Semimajor axis = 2.6865529188 AU Perihelion dist = 2.4000980331 AU Mag: H = 8.68, G = 0.15 Epoch of elements : MJD 60146.38368056 TDT (2023 Jul 21.3837) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1032023Apr24,14.26,2023,7,21,9.213892,0.091738,-0.426113,-4.586497,-0.985563,0.002810,-0.000720,0.000001,0.000000 -168.8435,-15.2868,43.41,20.48,False TYC 6249-00229-1,17.86049441,-15.2805972,0.00,11.78,0.00,0.0,0,,17.88319533,-15.2867759,1.53,0.00,0,0,0 34,Circe,13.00,118.5,1.9053,0,0,-1.462,-4.55,,5.8,0 0,113.4075,2023,7,21,329.9830,184.3312,5.4974,0.10663,2.68655,2.40010,8.67,5.0,0.15 1.154,0.0220,0.0127,90,0.0132,Known errors,-1.00,-1,-1,-1 20230721_0229-1,60092.98 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 28, 23:38 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org