IOTA/IOTA-ES occultation update for (34) Circe / UCAC4-366-106469 event on 2023 Aug 30, 00:24 UT Visible from South America Summary ------- On 2023 Aug 30 UT, the 118.5 km diameter asteroid (34) Circe will occult a 12.5 mag star in the constellation Sagittarius 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 1.59 mag to 13.78 mag (the magnitude of the asteroid) for at most 16.960 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 Aug 30, 00:08 - 2023 Aug 30, 00:39 * geocentric midpoint of event [JD]: 2460186.51641575 * magnitude of target star: 12.48 * magnitude drop [mag]: 1.59 * estimated maximum duration [s]: 16.960 * Moon: 98 % sunlit, 55° distance * Sun: 111° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 120 * 1 sigma uncertainty interval [path widths]: +/- 0.17 * 1 sigma uncertainty interval [seconds]: +/- 3.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.011) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.011", 90°) * approx speed of asteroid's shadow [km/s]: 6.9883 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-366-106469 by 34 Circe on 2023 Aug 30 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 -152 0 0 .. .. .... .. .. .. .. .. .. 31 57 1 .. .. .. 31 45 7 .. .. .. .... -151 0 0 32 12 40 0 8 36.3 1 110 53 31 38 11 32 47 12 31 26 15 32 59 10 .... -150 0 0 31 53 26 0 8 36.6 2 111 53 31 18 52 32 28 3 31 6 54 32 40 4 -0.02 -149 0 0 31 33 43 0 8 37.2 3 112 52 30 59 3 32 8 26 30 47 3 32 20 28 -0.06 -148 0 0 31 13 31 0 8 37.9 4 112 52 30 38 45 31 48 19 30 26 43 32 0 24 -0.08 -147 0 0 30 52 49 0 8 38.9 4 113 51 30 17 57 31 27 43 30 5 53 31 39 49 -0.09 -146 0 0 30 31 37 0 8 40.2 5 113 50 29 56 39 31 6 37 29 44 33 31 18 46 -0.09 -145 0 0 30 9 55 0 8 41.8 6 114 50 29 34 52 30 45 2 29 22 44 30 57 12 -0.10 -144 0 0 29 47 44 0 8 43.5 7 114 49 29 12 35 30 22 56 29 0 24 30 35 9 -0.10 -143 0 0 29 25 3 0 8 45.6 8 115 48 28 49 47 30 0 21 28 37 35 30 12 36 -0.10 -142 0 0 29 1 52 0 8 47.9 9 115 48 28 26 30 29 37 16 28 14 16 29 49 33 -0.10 -141 0 0 28 38 11 0 8 50.5 10 116 47 28 2 43 29 13 42 27 50 27 29 26 1 -0.11 -140 0 0 28 14 0 0 8 53.4 11 116 46 27 38 26 28 49 37 27 26 8 29 1 58 -0.11 -139 0 0 27 49 20 0 8 56.6 12 117 45 27 13 39 28 25 3 27 1 19 28 37 26 -0.11 -138 0 0 27 24 9 0 9 0.1 13 117 45 26 48 23 27 59 58 26 36 0 28 12 24 -0.11 -137 0 0 26 58 29 0 9 3.9 14 117 44 26 22 36 27 34 24 26 10 11 27 46 52 -0.11 -136 0 0 26 32 19 0 9 7.9 15 118 43 25 56 20 27 8 21 25 43 53 27 20 50 -0.11 -135 0 0 26 5 40 0 9 12.3 16 118 42 25 29 35 26 41 47 25 17 5 26 54 19 -0.11 -134 0 0 25 38 31 0 9 17.0 17 119 42 25 2 20 26 14 45 24 49 48 26 27 19 -0.11 -133 0 0 25 10 53 0 9 22.0 18 119 41 24 34 35 25 47 13 24 22 2 25 59 49 -0.11 -132 0 0 24 42 46 0 9 27.4 19 120 40 24 6 22 25 19 12 23 53 46 25 31 51 -0.11 -131 0 0 24 14 10 0 9 33.1 20 120 39 23 37 41 24 50 42 23 25 3 25 3 23 -0.11 -130 0 0 23 45 6 0 9 39.1 21 121 38 23 8 30 24 21 44 22 55 50 24 34 27 -0.11 -129 0 0 23 15 33 0 9 45.4 22 121 37 22 38 52 23 52 18 22 26 10 24 5 3 -0.11 -128 0 0 22 45 33 0 9 52.1 23 122 36 22 8 46 23 22 24 21 56 2 23 35 10 -0.11 -127 0 0 22 15 6 0 9 59.2 25 122 36 21 38 13 22 52 2 21 25 27 23 4 51 -0.11 -126 0 0 21 44 11 0 10 6.6 26 122 35 21 7 13 22 21 13 20 54 24 22 34 4 -0.11 -125 0 0 21 12 50 0 10 14.3 27 123 34 20 35 46 21 49 58 20 22 56 22 2 50 -0.11 -124 0 0 20 41 3 0 10 22.4 28 123 33 20 3 54 21 18 16 19 51 2 21 31 11 -0.11 -123 0 0 20 8 51 0 10 30.9 29 124 32 19 31 36 20 46 9 19 18 42 20 59 5 -0.11 -122 0 0 19 36 14 0 10 39.7 30 124 31 18 58 53 20 13 37 18 45 58 20 26 35 -0.11 -121 0 0 19 3 12 0 10 48.9 31 124 30 18 25 47 19 40 40 18 12 50 19 53 40 -0.11 -120 0 0 18 29 47 0 10 58.4 32 125 29 17 52 17 19 7 20 17 39 18 19 20 22 -0.12 -119 0 0 17 56 0 0 11 8.3 33 125 28 17 18 25 18 33 37 17 5 24 18 46 41 -0.12 -118 0 0 17 21 50 0 11 18.6 35 126 27 16 44 11 17 59 32 16 31 9 18 12 37 -0.12 -117 0 0 16 47 19 0 11 29.3 36 126 26 16 9 36 17 25 6 15 56 32 17 38 12 -0.12 -116 0 0 16 12 28 0 11 40.3 37 126 25 15 34 41 16 50 19 15 21 36 17 3 27 -0.12 -115 0 0 15 37 18 0 11 51.7 38 127 24 14 59 27 16 15 13 14 46 21 16 28 21 -0.12 -114 0 0 15 1 50 0 12 3.4 39 127 23 14 23 55 15 39 48 14 10 47 15 52 58 -0.12 -113 0 0 14 26 4 0 12 15.5 40 128 22 13 48 6 15 4 5 13 34 57 15 17 16 -0.12 -112 0 0 13 50 2 0 12 28.0 41 128 21 13 12 1 14 28 6 12 58 51 14 41 18 -0.12 -111 0 0 13 13 44 0 12 40.8 43 128 20 12 35 41 13 51 52 12 22 30 14 5 5 -0.12 -110 0 0 12 37 13 0 12 53.9 44 129 18 11 59 7 13 15 23 11 45 56 13 28 37 -0.12 -109 0 0 12 0 29 0 13 7.4 45 129 17 11 22 21 12 38 41 11 9 9 12 51 56 -0.12 -108 0 0 11 23 34 0 13 21.3 46 129 16 10 45 23 12 1 48 10 32 11 12 15 3 -0.12 -107 0 0 10 46 28 0 13 35.5 47 130 15 10 8 16 11 24 44 9 55 3 11 38 0 -0.12 -106 0 0 10 9 13 0 13 50.0 49 130 14 9 31 0 10 47 30 9 17 46 11 0 47 -0.12 -105 0 0 9 31 51 0 14 4.8 50 131 13 8 53 37 10 10 9 8 40 23 10 23 26 -0.12 -104 0 0 8 54 22 0 14 19.9 51 131 12 8 16 7 9 32 41 8 2 53 9 45 58 -0.12 -103 0 0 8 16 49 0 14 35.3 52 132 11 7 38 33 8 55 8 7 25 19 9 8 25 -0.12 -102 0 0 7 39 12 0 14 51.1 53 132 10 7 0 56 8 17 31 6 47 42 8 30 48 -0.12 -101 0 0 7 1 32 0 15 7.1 55 133 8 6 23 18 7 39 51 6 10 3 7 53 9 -0.13 -100 0 0 6 23 53 0 15 23.3 56 133 7 5 45 38 7 2 11 5 32 24 7 15 28 -0.13 - 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0 0 0 -19 56 33 0 38 11.3 14 257 -76 -20 29 32 -19 23 31 -20 40 57 -19 12 3 -0.14 1 0 0 -19 45 17 0 38 15.1 13 257 -75 -20 18 19 -19 12 12 -20 29 45 -19 0 43 -0.14 2 0 0 -19 33 30 0 38 18.6 13 256 -75 -20 6 36 -19 0 22 -20 18 3 -18 48 52 -0.14 3 0 0 -19 21 13 0 38 21.9 12 256 -74 -19 54 22 -18 48 1 -20 5 51 -18 36 30 -0.14 4 0 0 -19 8 25 0 38 24.9 11 256 -74 -19 41 38 -18 35 10 -19 53 8 -18 23 38 -0.13 5 0 0 -18 55 7 0 38 27.7 10 255 -73 -19 28 24 -18 21 48 -19 39 55 -18 10 15 -0.13 6 0 0 -18 41 19 0 38 30.2 9 255 -72 -19 14 39 -18 7 56 -19 26 12 -17 56 21 -0.13 7 0 0 -18 27 0 0 38 32.4 8 255 -72 -19 0 24 -17 53 34 -19 11 58 -17 41 58 -0.13 8 0 0 -18 12 12 0 38 34.4 7 254 -71 -18 45 40 -17 38 41 -18 57 15 -17 27 3 -0.13 9 0 0 -17 56 53 0 38 36.1 6 254 -70 -18 30 25 -17 23 18 -18 42 2 -17 11 39 -0.13 10 0 0 -17 41 4 0 38 37.6 5 254 -69 -18 14 40 -17 7 25 -18 26 19 -16 55 45 -0.13 11 0 0 -17 24 46 0 38 38.7 4 253 -68 -17 58 26 -16 51 2 -18 10 6 -16 39 21 -0.12 12 0 0 -17 7 57 0 38 39.6 3 253 -68 -17 41 42 -16 34 10 -17 53 23 -16 22 26 -0.12 13 0 0 -16 50 40 0 38 40.2 2 253 -67 -17 24 29 -16 16 48 -17 36 12 -16 5 3 -0.11 14 0 0 -16 32 53 0 38 40.5 1 253 -66 -17 6 47 -15 58 56 -17 18 31 -15 47 10 -0.07 Uncertainty in time = +/- 4 secs Prediction of 2023 Aug 6.7 Data for the target star ------------------------ * name: UCAC4-366-106469 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 47 23.5695 DE: -16 50 02.303 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 47 23.5694 DE: -16 50 02.303 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (34) Circe asteroid class: approx. diameter [km]: 119 approx. diameter ["]: 0.070 distance from Earth [AU]: 2.34180 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#105 date of fit: 2023 Jul 30 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): 0.017", 0.011", 90.013° remarks: * orbital elements for (34)Circe : Mean anomaly = 122.3912592423 deg Arg. of pericenter = 329.9574658370 deg Long. of node = 184.3312532322 deg Inclination = 5.4973875432 deg Eccentricity = 0.1066449732 Semimajor axis = 2.6864223947 AU Perihelion dist = 2.3999289505 AU Mag: H = 8.80, G = 0.15 Epoch of elements : MJD 60186.01666667 TDT (2023 Aug 30.0167) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1052023Jul30,16.96,2023,8,30,0.393978,0.063199,0.132818,3.561001,-1.696339,0.005240,-0.000327,0.000000,0.000000 -76.6653,-16.8426,174.31,9.16,False UCAC4-366-106469,17.78988043,-16.8339730,0.00,12.48,0.00,0.0,0,,17.81274827,-16.8425793,1.58,0.00,0,0,0 34,Circe,13.78,118.500,2.3418,0,0,0.932,-6.37,,5.8,0 0,122.1637,2023,8,29,329.9575,184.3313,5.4974,0.10664,2.68642,2.39993,8.67,5.0,0.15 1.173,0.0170,0.0107,90,0.0201,Known errors,-1.00,0,-1,-1 20230830_106469,60162.67 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 06, 16:08 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org