IOTA/IOTA-ES occultation update for (370) Modestia / UCAC4 355-177597 event on 2024 Oct 08, 19:17 UT Visible from Summary ------- On 2024 Oct 08 UT, the 41.0451251196808 km diameter asteroid (370) Modestia will occult a 11.0 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 4.03 mag to 15.02 mag (the magnitude of the asteroid) for at most 2.290 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 Oct 08, 19:12 - 2024 Oct 08, 19:23 * geocentric midpoint of event [JD]: 2460592.30409354 * magnitude of target star: 11.02 * magnitude drop [mag]: 4.03 * estimated maximum duration [s]: 2.290 * Moon: 30 % sunlit, 26° distance * Sun: 91° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 44 * 1 sigma uncertainty interval [path widths]: +/- 0.10 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.020, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.003", 74°) * approx speed of asteroid's shadow [km/s]: 17.9869 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 355-177597 by 370 Modestia on 2024 Oct 8 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 -119 0 0 -29 25 6 19 12 19.9 0 112 66 -29 37 54 -29 12 19 -29 40 32 -29 9 41 .... -118 0 0 -29 45 59 19 12 20.0 1 111 66 -29 58 46 -29 33 13 -30 1 24 -29 30 35 0.34 -117 0 0 -30 6 37 19 12 20.2 2 111 66 -30 19 23 -29 53 52 -30 22 2 -29 51 15 0.35 -116 0 0 -30 27 2 19 12 20.5 3 110 65 -30 39 47 -30 14 18 -30 42 25 -30 11 40 0.35 -115 0 0 -30 47 11 19 12 20.9 4 110 65 -30 59 55 -30 34 28 -31 2 33 -30 31 51 0.36 -114 0 0 -31 7 5 19 12 21.4 5 109 65 -31 19 49 -30 54 23 -31 22 26 -30 51 46 0.36 -113 0 0 -31 26 45 19 12 22.0 6 109 65 -31 39 27 -31 14 3 -31 42 4 -31 11 26 0.36 -112 0 0 -31 46 8 19 12 22.7 7 108 65 -31 58 49 -31 33 28 -32 1 26 -31 30 51 0.36 -111 0 0 -32 5 15 19 12 23.5 8 107 64 -32 17 55 -31 52 36 -32 20 32 -31 49 59 0.36 -110 0 0 -32 24 6 19 12 24.3 9 107 64 -32 36 45 -32 11 28 -32 39 22 -32 8 52 0.36 -109 0 0 -32 42 41 19 12 25.3 10 106 64 -32 55 19 -32 30 4 -32 57 56 -32 27 28 0.36 -108 0 0 -33 0 59 19 12 26.3 11 106 63 -33 13 36 -32 48 23 -33 16 12 -32 45 47 0.36 -107 0 0 -33 19 0 19 12 27.5 11 105 63 -33 31 36 -33 6 25 -33 34 12 -33 3 49 0.36 -106 0 0 -33 36 44 19 12 28.7 12 105 62 -33 49 18 -33 24 10 -33 51 54 -33 21 34 0.36 -105 0 0 -33 54 10 19 12 30.0 13 104 62 -34 6 43 -33 41 37 -34 9 19 -33 39 2 0.36 -104 0 0 -34 11 19 19 12 31.3 14 104 61 -34 23 51 -33 58 47 -34 26 27 -33 56 12 0.36 -103 0 0 -34 28 10 19 12 32.8 15 103 61 -34 40 41 -34 15 40 -34 43 16 -34 13 5 0.36 -102 0 0 -34 44 43 19 12 34.3 16 102 60 -34 57 13 -34 32 14 -34 59 48 -34 29 39 0.36 -101 0 0 -35 0 58 19 12 35.9 17 102 60 -35 13 27 -34 48 30 -35 16 2 -34 45 56 0.36 -100 0 0 -35 16 55 19 12 37.6 18 101 59 -35 29 22 -35 4 28 -35 31 57 -35 1 54 0.36 - 99 0 0 -35 32 33 19 12 39.4 18 101 59 -35 45 0 -35 20 8 -35 47 34 -35 17 34 0.36 - 98 0 0 -35 47 53 19 12 41.2 19 100 58 -36 0 18 -35 35 29 -36 2 52 -35 32 55 0.36 - 97 0 0 -36 2 55 19 12 43.1 20 99 58 -36 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-11 52 26 -11 21 37 0.39 62 0 0 -11 13 54 19 23 22.3 10 252 -72 -11 26 40 -11 1 9 -11 29 19 -10 58 31 0.40 63 0 0 -10 50 59 19 23 23.4 9 252 -73 -11 3 45 -10 38 15 -11 6 23 -10 35 38 0.40 64 0 0 -10 28 17 19 23 24.4 8 252 -73 -10 41 1 -10 15 34 -10 43 39 -10 12 57 0.41 65 0 0 -10 5 48 19 23 25.3 7 252 -74 -10 18 31 - 9 53 6 -10 21 9 - 9 50 29 0.41 66 0 0 - 9 43 32 19 23 26.0 6 252 -74 - 9 56 14 - 9 30 51 - 9 58 51 - 9 28 14 0.42 67 0 0 - 9 21 30 19 23 26.6 5 252 -74 - 9 34 11 - 9 8 50 - 9 36 48 - 9 6 13 0.43 68 0 0 - 8 59 42 19 23 27.1 4 251 -75 - 9 12 22 - 8 47 3 - 9 14 59 - 8 44 27 0.45 69 0 0 - 8 38 9 19 23 27.5 3 251 -75 - 8 50 48 - 8 25 32 - 8 53 25 - 8 22 55 0.49 70 0 0 - 8 16 52 19 23 27.7 1 251 -75 - 8 29 29 - 8 4 15 - 8 32 6 - 8 1 39 0.58 71 0 0 - 7 55 50 19 23 27.9 0 251 -75 - 8 8 26 - 7 43 14 - 8 11 2 - 7 40 39 1.13 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 355-177597 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 08 32.3424 DE: -19 00 38.530 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 08 32.3423 DE: -19 00 38.530 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.0 * B mag [mag]: 11.7 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (370) Modestia asteroid class: approx. diameter [km]: 41 approx. diameter ["]: 0.030 distance from Earth [AU]: 1.91480 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#54 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): 0.021", 0.003", 74.279° remarks: * orbital elements for (370)Modestia : Mean anomaly = 321.4693093844 deg Arg. of pericenter = 68.5960759366 deg Long. of node = 290.8795873113 deg Inclination = 7.8621540420 deg Eccentricity = 0.0905015179 Semimajor axis = 2.3244557505 AU Perihelion dist = 2.1140889768 AU Mag: H = 10.71, G = 0.15 Epoch of elements : MJD 60591.80409329 TDT (2024 Oct 08.8041) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,2.29,2024,10,8,19.298245,0.065696,-0.328057,9.953478,1.999460,0.005420,0.000656,0.000000,0.000000 -19.8882,-18.9719,-112.64,-6.30,False UCAC4 355-177597,19.14231736,-19.0107027,11.70,11.02,10.65,0.1,0,,19.16645441,-18.9719104,4.02,3.94,0,0,0 370,Modestia,15.02,41.184,1.9148,0,0,3.223,9.19,,2.4,0 0,321.2457,2024,10,8,68.5961,290.8796,7.8622,0.09050,2.32446,2.11409,10.70,5.0,0.15 1.103,0.0207,0.0026,74,0.0031,Known errors,0.96,0,-1,-1 20241008_177597,60140.62 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org