IOTA/IOTA-ES occultation update for (376) Geometria / UCAC4 333-135303 event on 2024 Sep 21, 19:46 UT Visible from Summary ------- On 2024 Sep 21 UT, the 35.739 km diameter asteroid (376) Geometria will occult a 11.9 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.79 mag to 13.41 mag (the magnitude of the asteroid) for at most 1.760 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: 2024 Sep 21, 19:41 - 2024 Sep 21, 19:52 * geocentric midpoint of event [JD]: 2460575.32414716 * magnitude of target star: 11.85 * magnitude drop [mag]: 1.79 * estimated maximum duration [s]: 1.760 * Moon: 80 % sunlit, 141° distance * Sun: 91° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 36 * 1 sigma uncertainty interval [path widths]: +/- 0.11 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.028, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.028", 0.003", 85°) * approx speed of asteroid's shadow [km/s]: 20.3230 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 333-135303 by 376 Geometria on 2024 Sep 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 -122 0 0 -16 10 30 19 41 38.2 1 114 73 -16 21 22 -15 59 39 -16 23 51 -15 57 10 .... -121 0 0 -16 36 49 19 41 38.3 2 114 73 -16 47 40 -16 25 58 -16 50 9 -16 23 29 0.22 -120 0 0 -17 2 59 19 41 38.6 3 114 73 -17 13 50 -16 52 9 -17 16 19 -16 49 40 0.21 -119 0 0 -17 28 59 19 41 38.9 4 113 72 -17 39 50 -17 18 9 -17 42 19 -17 15 41 0.21 -118 0 0 -17 54 49 19 41 39.4 5 113 72 -18 5 39 -17 44 0 -18 8 8 -17 41 31 0.21 -117 0 0 -18 20 28 19 41 39.9 6 113 71 -18 31 18 -18 9 40 -18 33 46 -18 7 11 0.21 -116 0 0 -18 45 56 19 41 40.6 7 112 71 -18 56 45 -18 35 8 -18 59 13 -18 32 40 0.20 -115 0 0 -19 11 12 19 41 41.4 8 112 70 -19 22 0 -19 0 24 -19 24 28 -18 57 56 0.20 -114 0 0 -19 36 14 19 41 42.3 9 112 70 -19 47 2 -19 25 28 -19 49 30 -19 23 0 0.20 -113 0 0 -20 1 4 19 41 43.2 10 111 69 -20 11 51 -19 50 18 -20 14 19 -19 47 50 0.20 -112 0 0 -20 25 40 19 41 44.3 11 111 69 -20 36 26 -20 14 55 -20 38 54 -20 12 27 0.20 -111 0 0 -20 50 2 19 41 45.5 12 111 68 -21 0 47 -20 39 17 -21 3 15 -20 36 50 0.20 -110 0 0 -21 14 9 19 41 46.7 13 110 67 -21 24 54 -21 3 25 -21 27 21 -21 0 58 0.20 -109 0 0 -21 38 1 19 41 48.1 14 110 67 -21 48 45 -21 27 18 -21 51 12 -21 24 51 0.20 -108 0 0 -22 1 38 19 41 49.5 15 110 66 -22 12 20 -21 50 55 -22 14 47 -21 48 28 0.20 -107 0 0 -22 24 58 19 41 51.1 16 109 65 -22 35 40 -22 14 16 -22 38 7 -22 11 50 0.20 -106 0 0 -22 48 2 19 41 52.7 17 109 65 -22 58 43 -22 37 21 -23 1 9 -22 34 55 0.20 -105 0 0 -23 10 48 19 41 54.4 18 108 64 -23 21 28 -23 0 9 -23 23 55 -22 57 43 0.20 -104 0 0 -23 33 18 19 41 56.2 19 108 63 -23 43 57 -23 22 39 -23 46 23 -23 20 13 0.20 -103 0 0 -23 55 30 19 41 58.1 20 108 62 -24 6 8 -23 44 52 -24 8 34 -23 42 26 0.20 -102 0 0 -24 17 24 19 42 0.1 21 107 61 -24 28 1 -24 6 47 -24 30 26 -24 4 21 0.20 -101 0 0 -24 38 59 19 42 2.1 22 107 61 -24 49 35 -24 28 23 -24 52 1 -24 25 58 0.20 -100 0 0 -25 0 16 19 42 4.2 23 106 60 -25 10 51 -24 49 41 -25 13 16 -24 47 16 0.20 - 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4 21 11 0.36 63 0 0 - 4 7 59 19 51 54.7 0 246 -85 - 4 18 46 - 3 57 11 - 4 21 15 - 3 54 43 0.77 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 333-135303 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 01 53.2333 DE: -23 32 16.535 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 01 53.2332 DE: -23 32 16.535 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.9 * B mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (376) Geometria asteroid class: approx. diameter [km]: 36 approx. diameter ["]: 0.030 distance from Earth [AU]: 1.66920 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#101 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): 0.028", 0.003", 84.693° remarks: * orbital elements for (376)Geometria : Mean anomaly = 30.3812704523 deg Arg. of pericenter = 316.5553792427 deg Long. of node = 301.9513757331 deg Inclination = 5.4304187944 deg Eccentricity = 0.1726263165 Semimajor axis = 2.2882572116 AU Perihelion dist = 1.8932437979 AU Mag: H = 9.52, G = 0.15 Epoch of elements : MJD 60574.82414696 TDT (2024 Sep 21.8241) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1012023Apr24,1.76,2024,9,21,19.779532,0.020698,-0.185223,11.398130,1.289828,0.005163,0.000028,0.000000,0.000000 -27.0204,-23.5390,-118.50,0.27,False UCAC4 333-135303,18.03145372,-23.5379265,12.38,11.85,11.56,0.0,0,,18.05652649,-23.5390162,1.79,1.66,0,0,0 376,Geometria,13.41,35.739,1.6692,0,0,4.367,6.80,,2.0,0 0,30.1466,2024,9,21,316.5554,301.9514,5.4304,0.17263,2.28826,1.89324,9.51,5.0,0.15 1.114,0.0277,0.0033,85,0.0034,Known errors,0.75,0,-1,-1 20240921_135303,60140.58 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org