IOTA/IOTA-ES occultation update for (2308) Schilt / UCAC4 312-105413 event on 2024 Mar 10, 05:27 UT Visible from Summary ------- On 2024 Mar 10 UT, the 17.5839229177189 km diameter asteroid (2308) Schilt will occult a 10.7 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.64 mag to 16.33 mag (the magnitude of the asteroid) for at most 0.870 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 Mar 10, 05:22 - 2024 Mar 10, 05:31 * geocentric midpoint of event [JD]: 2460379.72712604 * magnitude of target star: 10.70 * magnitude drop [mag]: 5.64 * estimated maximum duration [s]: 0.870 * Moon: 0 % sunlit, 90° distance * Sun: 92° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 19 * 1 sigma uncertainty interval [path widths]: +/- 0.25 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.019, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.020", 0.002", 107°) * approx speed of asteroid's shadow [km/s]: 20.4285 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 312-105413 by 2308 Schilt on 2024 Mar 10 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 - 80 0 0 1 31 44 5 22 14.6 1 118 -87 1 25 49 1 37 38 1 22 50 1 40 37 .... - 79 0 0 0 59 8 5 22 14.8 2 118 -87 0 53 12 1 5 4 0 50 11 1 8 4 0.38 - 78 0 0 0 25 51 5 22 15.1 3 118 -87 0 19 53 0 31 49 0 16 52 0 34 50 0.39 - 77 0 0 - 0 8 7 5 22 15.5 4 118 -86 - 0 14 7 - 0 2 7 - 0 17 9 0 0 55 0.40 - 76 0 0 - 0 42 45 5 22 16.1 6 118 -85 - 0 48 47 - 0 36 43 - 0 51 50 - 0 33 41 0.41 - 75 0 0 - 1 18 3 5 22 16.9 7 118 -84 - 1 24 6 - 1 12 0 - 1 27 10 - 1 8 56 0.41 - 74 0 0 - 1 54 0 5 22 17.7 8 118 -83 - 2 0 5 - 1 47 55 - 2 3 10 - 1 44 51 0.41 - 73 0 0 - 2 30 36 5 22 18.8 9 118 -82 - 2 36 43 - 2 24 30 - 2 39 49 - 2 21 24 0.41 - 72 0 0 - 3 7 51 5 22 19.9 10 118 -81 - 3 14 0 - 3 1 42 - 3 17 6 - 2 58 36 0.41 - 71 0 0 - 3 45 43 5 22 21.2 11 117 -80 - 3 51 53 - 3 39 32 - 3 55 1 - 3 36 25 0.41 - 70 0 0 - 4 24 11 5 22 22.7 13 117 -78 - 4 30 24 - 4 17 59 - 4 33 32 - 4 14 51 0.41 - 69 0 0 - 5 3 16 5 22 24.3 14 117 -77 - 5 9 30 - 4 57 2 - 5 12 40 - 4 53 53 0.42 - 68 0 0 - 5 42 56 5 22 26.0 15 117 -76 - 5 49 12 - 5 36 41 - 5 52 23 - 5 33 31 0.42 - 67 0 0 - 6 23 10 5 22 27.9 16 117 -75 - 6 29 28 - 6 16 53 - 6 32 39 - 6 13 42 0.42 - 66 0 0 - 7 3 58 5 22 30.0 17 117 -74 - 7 10 18 - 6 57 39 - 7 13 30 - 6 54 27 0.42 - 65 0 0 - 7 45 18 5 22 32.2 19 117 -73 - 7 51 39 - 7 38 57 - 7 54 52 - 7 35 44 0.42 - 64 0 0 - 8 27 8 5 22 34.6 20 116 -71 - 8 33 31 - 8 20 46 - 8 36 45 - 8 17 32 0.42 - 63 0 0 - 9 9 29 5 22 37.1 21 116 -70 - 9 15 54 - 9 3 4 - 9 19 8 - 8 59 50 0.42 - 62 0 0 - 9 52 18 5 22 39.7 22 116 -69 - 9 58 44 - 9 45 52 -10 2 0 - 9 42 36 0.42 - 61 0 0 -10 35 34 5 22 42.5 23 116 -68 -10 42 2 -10 29 6 -10 45 18 -10 25 50 0.42 - 60 0 0 -11 19 16 5 22 45.5 25 115 -66 -11 25 46 -11 12 46 -11 29 3 -11 9 30 0.42 - 59 0 0 -12 3 22 5 22 48.6 26 115 -65 -12 9 53 -11 56 51 -12 13 11 -11 53 33 0.42 - 58 0 0 -12 47 50 5 22 51.8 27 115 -64 -12 54 23 -12 41 18 -12 57 42 -12 38 0 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115 0 0 -44 0 52 5 31 50.2 6 237 48 -44 7 15 -43 54 30 -44 10 29 -43 51 17 0.48 116 0 0 -43 29 43 5 31 50.8 5 237 48 -43 36 7 -43 23 19 -43 39 22 -43 20 5 0.49 117 0 0 -42 57 56 5 31 51.2 5 236 48 -43 4 21 -42 51 30 -43 7 37 -42 48 15 0.50 118 0 0 -42 25 30 5 31 51.6 4 235 48 -42 31 57 -42 19 3 -42 35 13 -42 15 47 0.52 119 0 0 -41 52 26 5 31 51.9 3 235 48 -41 58 55 -41 45 58 -42 2 12 -41 42 42 0.56 120 0 0 -41 18 45 5 31 52.2 2 234 48 -41 25 16 -41 12 15 -41 28 33 -41 8 58 0.64 121 0 0 -40 44 27 5 31 52.3 1 233 48 -40 50 58 -40 37 55 -40 54 17 -40 34 38 0.91 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 14.2 Data for the target star ------------------------ * name: UCAC4 312-105413 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 06 40.0645 DE: -27 37 39.175 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 06 40.0646 DE: -27 37 39.175 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.7 * B mag [mag]: 11.5 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2308) Schilt asteroid class: approx. diameter [km]: 18 approx. diameter ["]: 0.013 distance from Earth [AU]: 1.90380 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#52 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): 0.020", 0.002", 107° remarks: * orbital elements for (2308)Schilt : Mean anomaly = 334.3763670650 deg Arg. of pericenter = 233.2972828252 deg Long. of node = 34.2039982321 deg Inclination = 14.1746870995 deg Eccentricity = 0.1719819997 Semimajor axis = 2.5493045513 AU Perihelion dist = 2.1108700566 AU Mag: H = 12.03, G = 0.15 Epoch of elements : MJD 60379.22712591 TDT (2024 Mar 10.2271) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#522023Apr24,0.87,2024,3,10,5.451025,-0.155863,-0.343695,10.500347,-4.763740,-0.005536,0.000513,0.000000,0.000000 6.8936,-27.6601,100.79,-3.91,False UCAC4 312-105413,17.11112900,-27.6275486,11.52,10.70,10.26,0.1,0,,17.13626838,-27.6601336,5.64,5.63,0,0,0 2308,Schilt,16.33,17.722,1.9038,0,0,3.651,-22.01,,1.2,0 0,334.3214,2024,3,10,233.2973,34.2040,14.1747,0.17198,2.54930,2.11087,12.03,5.0,0.15 1.253,0.0197,0.0020,107,0.0032,Known errors,0.77,0,-1,-1 20240310_105413,60139.22 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 05:21 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org