IOTA/IOTA-ES occultation update for (2308) Schilt / UCAC4 229-124490 event on 2024 Jul 09, 23:22 UT Visible from Summary ------- On 2024 Jul 09 UT, the 17.6312532188003 km diameter asteroid (2308) Schilt will occult a 11.1 mag star in the constellation Scorpius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.84 mag to 14.94 mag (the magnitude of the asteroid) for at most 4.240 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 Jul 09, 22:57 - 2024 Jul 09, 23:48 * geocentric midpoint of event [JD]: 2460501.47423370 * magnitude of target star: 11.13 * magnitude drop [mag]: 3.84 * estimated maximum duration [s]: 4.240 * Moon: 15 % sunlit, 104° distance * Sun: 144° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 18 * 1 sigma uncertainty interval [path widths]: +/- 0.28 * 1 sigma uncertainty interval [seconds]: +/- 6.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.031, +/- 0.012) * 1 sigma uncertainty ellipse (major, minor, PA): (0.033", 0.005", 110°) * approx speed of asteroid's shadow [km/s]: 4.1984 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 229-124490 by 2308 Schilt on 2024 Jul 9 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 -110 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 10 38 0 .... -109 0 0 9 48 28 23 48 13.0 1 136 25 9 55 22 9 41 33 9 59 15 9 37 41 .... -108 0 0 8 47 52 23 48 11.7 3 136 24 8 54 47 8 40 57 8 58 40 8 37 4 0.01 -107 0 0 7 47 1 23 48 9.5 4 136 23 7 53 56 7 40 6 7 57 50 7 36 13 -0.02 -106 0 0 6 46 0 23 48 6.4 6 136 21 6 52 55 6 39 5 6 56 48 6 35 12 -0.04 -105 0 0 5 44 51 23 48 2.3 7 136 20 5 51 46 5 37 56 5 55 39 5 34 3 -0.05 -104 0 0 4 43 38 23 47 57.4 8 136 19 4 50 32 4 36 43 4 54 26 4 32 50 -0.05 -103 0 0 3 42 24 23 47 51.5 10 136 17 3 49 18 3 35 29 3 53 11 3 31 36 -0.06 -102 0 0 2 41 12 23 47 44.8 11 136 16 2 48 6 2 34 18 2 51 59 2 30 26 -0.06 -101 0 0 1 40 6 23 47 37.2 13 136 15 1 47 0 1 33 13 1 50 52 1 29 21 -0.06 -100 0 0 0 39 10 23 47 28.7 14 136 14 0 46 3 0 32 17 0 49 54 0 28 25 -0.06 - 99 0 0 - 0 21 35 23 47 19.3 15 136 12 - 0 14 43 - 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31 -0.04 81 0 0 -11 40 23 22 57 36.2 2 225 -28 -11 33 32 -11 47 13 -11 29 42 -11 51 3 -0.01 82 0 0 -10 41 0 22 57 35.4 0 225 -27 -10 34 8 -10 47 53 -10 30 16 -10 51 44 0.19 Uncertainty in time = +/- 7 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 229-124490 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 57 42.8269 DE: -44 21 17.433 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 57 42.8269 DE: -44 21 17.433 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.1 * B mag [mag]: 12.7 * Diameter [mas]: 0.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2308) Schilt asteroid class: approx. diameter [km]: 18 approx. diameter ["]: 0.020 distance from Earth [AU]: 1.20470 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): 0.033", 0.005", 109.638° remarks: * orbital elements for (2308)Schilt : Mean anomaly = 3.8648470260 deg Arg. of pericenter = 233.2865170207 deg Long. of node = 34.2028184589 deg Inclination = 14.1743550760 deg Eccentricity = 0.1719192341 Semimajor axis = 2.5491355289 AU Perihelion dist = 2.1108901011 AU Mag: H = 12.03, G = 0.15 Epoch of elements : MJD 60500.97423412 TDT (2024 Jul 09.9742) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#522023Apr24,4.24,2024,7,9,23.381609,0.001142,0.004511,-2.291632,0.603225,0.002772,0.001352,0.000001,0.000000 -24.2329,-44.3948,-169.37,22.20,False UCAC4 229-124490,16.96189638,-44.3548423,12.65,11.13,10.31,0.2,0,,16.99177507,-44.3947731,3.85,4.21,0,0,0 2308,Schilt,14.94,17.806,1.2047,0,0,-1.559,4.41,,1.2,0 0,3.6289,2024,7,9,233.2865,34.2028,14.1744,0.17192,2.54914,2.11089,12.03,5.0,0.15 1.281,0.0333,0.0050,110,0.0057,Known errors,1.00,0,-1,-1 20240709_124490,60140.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org