IOTA/IOTA-ES occultation update for (3993) Sorm / TYC 6286-00905-1 event on 2024 Jul 18, 03:28 UT Visible from Summary ------- On 2024 Jul 18 UT, the 8.35586506129173 km diameter asteroid (3993) Sorm will occult a 8.3 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 8.42 mag to 16.70 mag (the magnitude of the asteroid) for at most 0.750 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: 75 * date and approx. time of event: 2024 Jul 18, 03:20 - 2024 Jul 18, 03:36 * geocentric midpoint of event [JD]: 2460509.64506287 * magnitude of target star: 8.28 * magnitude drop [mag]: 8.42 * estimated maximum duration [s]: 0.750 * Moon: 86 % sunlit, 33° distance * Sun: 167° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 10 * 1 sigma uncertainty interval [path widths]: +/- 0.75 * 1 sigma uncertainty interval [seconds]: +/- 1.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.005", 86°) * approx speed of asteroid's shadow [km/s]: 11.4441 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6286-00905-1 by 3993 Sorm on 2024 Jul 18 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 -170 0 0 -39 2 30 3 36 36.2 0 113 6 -38 59 29 -39 5 32 -38 54 56 -39 10 6 .... -169 0 0 -39 22 29 3 36 36.1 1 112 6 -39 19 27 -39 25 31 -39 14 55 -39 30 4 0.56 -168 0 0 -39 42 17 3 36 35.7 2 112 5 -39 39 16 -39 45 19 -39 34 43 -39 49 52 0.60 -167 0 0 -40 1 55 3 36 35.3 3 111 4 -39 58 53 -40 4 56 -39 54 21 -40 9 29 0.62 -166 0 0 -40 21 21 3 36 34.7 4 110 3 -40 18 20 -40 24 23 -40 13 48 -40 28 55 0.62 -165 0 0 -40 40 36 3 36 34.0 5 110 2 -40 37 35 -40 43 38 -40 33 3 -40 48 10 0.63 -164 0 0 -40 59 40 3 36 33.2 5 109 1 -40 56 39 -41 2 41 -40 52 7 -41 7 13 0.63 -163 0 0 -41 18 31 3 36 32.2 6 108 1 -41 15 31 -41 21 32 -41 10 59 -41 26 5 0.64 -162 0 0 -41 37 11 3 36 31.1 7 108 0 -41 34 10 -41 40 12 -41 29 39 -41 44 44 0.64 -161 0 0 -41 55 38 3 36 29.8 8 107 -1 -41 52 37 -41 58 38 -41 48 6 -42 3 10 0.64 -160 0 0 -42 13 52 3 36 28.5 9 106 -2 -42 10 51 -42 16 52 -42 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46 7 -26 1 0 0.89 36 0 0 -25 33 35 3 21 10.4 1 251 -13 -25 30 37 -25 36 33 -25 26 9 -25 41 1 1.11 37 0 0 -25 13 46 3 21 10.3 0 250 -12 -25 10 48 -25 16 44 .. .. .. -25 21 11 13.65 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: TYC 6286-00905-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 58 49.8325 DE: -17 56 22.269 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 58 49.8325 DE: -17 56 22.268 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 8.3 * B mag [mag]: 8.8 * Diameter [mas]: 0.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3993) Sorm asteroid class: approx. diameter [km]: 8 approx. diameter ["]: 0.007 distance from Earth [AU]: 1.75200 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): 0.016", 0.005", 85.654° remarks: * orbital elements for (3993)Sorm : Mean anomaly = 195.2535082243 deg Arg. of pericenter = 249.4358426702 deg Long. of node = 205.6638745685 deg Inclination = 3.0699994866 deg Eccentricity = 0.0733980013 Semimajor axis = 2.5699096502 AU Perihelion dist = 2.3812834184 AU Mag: H = 12.88, G = 0.15 Epoch of elements : MJD 60509.14506317 TDT (2024 Jul 18.1451) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#522023Apr24,0.75,2024,7,18,3.481509,0.070582,-0.550504,-6.407113,-0.820046,0.001176,-0.000327,0.000001,0.000000 -63.5914,-17.9061,129.35,20.94,False TYC 6286-00905-1,18.98050904,-17.9395191,8.81,8.28,7.99,0.2,0,,19.00467175,-17.9061020,8.42,8.25,0,0,0 3993,Sorm,16.70,8.610,1.7520,0,0,-2.252,-4.11,,0.8,0 0,195.2188,2024,7,18,249.4358,205.6639,3.0700,0.07340,2.56991,2.38128,12.88,5.0,0.15 1.751,0.0160,0.0050,86,0.0051,Known errors,0.98,0,-1,-1 20240718_0905-1,60140.21 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:57 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org