IOTA/IOTA-ES occultation update for (370) Modestia / UCAC4 354-165902 event on 2024 Oct 03, 20:57 UT Visible from Summary ------- On 2024 Oct 03 UT, the 41.127 km diameter asteroid (370) Modestia will occult a 12.0 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 3.07 mag to 14.96 mag (the magnitude of the asteroid) for at most 2.540 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: 100 * date and approx. time of event: 2024 Oct 03, 20:52 - 2024 Oct 03, 21:03 * geocentric midpoint of event [JD]: 2460587.37336867 * magnitude of target star: 11.96 * magnitude drop [mag]: 3.07 * estimated maximum duration [s]: 2.540 * Moon: 1 % sunlit, 83° distance * Sun: 94° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 51 * 1 sigma uncertainty interval [path widths]: +/- 0.10 * 1 sigma uncertainty interval [seconds]: +/- 1.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.021, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.003", 75°) * approx speed of asteroid's shadow [km/s]: 16.2000 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 354-165902 by 370 Modestia on 2024 Oct 3 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 -149 0 0 -44 14 45 20 52 19.5 1 117 49 -44 30 15 -43 59 19 -44 33 19 -43 56 16 .... -148 0 0 -44 36 47 20 52 19.6 1 116 48 -44 52 16 -44 21 21 -44 55 20 -44 18 19 0.65 -147 0 0 -44 58 33 20 52 19.9 2 115 48 -45 14 1 -44 43 9 -45 17 5 -44 40 6 0.68 -146 0 0 -45 20 4 20 52 20.2 3 115 48 -45 35 31 -45 4 41 -45 38 35 -45 1 39 0.69 -145 0 0 -45 41 20 20 52 20.6 4 114 48 -45 56 46 -45 25 58 -45 59 49 -45 22 56 0.70 -144 0 0 -46 2 20 20 52 21.1 5 113 48 -46 17 44 -45 46 59 -46 20 47 -45 43 57 0.70 -143 0 0 -46 23 3 20 52 21.6 5 112 48 -46 38 26 -46 7 44 -46 41 29 -46 4 42 0.71 -142 0 0 -46 43 30 20 52 22.3 6 112 47 -46 58 51 -46 28 12 -47 1 54 -46 25 11 0.71 -141 0 0 -47 3 40 20 52 23.0 7 111 47 -47 19 0 -46 48 23 -47 22 2 -46 45 23 0.71 -140 0 0 -47 23 33 20 52 23.9 8 110 47 -47 38 51 -47 8 18 -47 41 53 -47 5 17 0.71 -139 0 0 -47 43 8 20 52 24.8 8 109 47 -47 58 25 -47 27 55 -48 1 27 -47 24 55 0.71 -138 0 0 -48 2 26 20 52 25.7 9 109 46 -48 17 41 -47 47 15 -48 20 43 -47 44 15 0.72 -137 0 0 -48 21 27 20 52 26.8 10 108 46 -48 36 40 -48 6 17 -48 39 41 -48 3 17 0.72 -136 0 0 -48 40 9 20 52 27.9 11 107 46 -48 55 21 -48 25 1 -48 58 21 -48 22 2 0.72 -135 0 0 -48 58 34 20 52 29.1 11 106 46 -49 13 43 -48 43 27 -49 16 43 -48 40 28 0.72 -134 0 0 -49 16 40 20 52 30.3 12 106 45 -49 31 48 -49 1 35 -49 34 47 -48 58 36 0.72 -133 0 0 -49 34 27 20 52 31.6 13 105 45 -49 49 34 -49 19 24 -49 52 33 -49 16 26 0.72 -132 0 0 -49 51 57 20 52 33.0 13 104 44 -50 7 1 -49 36 55 -50 10 0 -49 33 58 0.72 -131 0 0 -50 9 7 20 52 34.4 14 103 44 -50 24 10 -49 54 8 -50 27 8 -49 51 11 0.72 -130 0 0 -50 25 59 20 52 35.9 15 102 44 -50 41 0 -50 11 2 -50 43 58 -50 8 5 0.72 -129 0 0 -50 42 33 20 52 37.5 15 102 43 -50 57 31 -50 27 37 -51 0 29 -50 24 41 0.72 -128 0 0 -50 58 47 20 52 39.1 16 101 43 -51 13 44 -50 43 54 -51 16 41 -50 40 58 0.72 -127 0 0 -51 14 43 20 52 40.7 17 100 43 -51 29 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0.77 44 0 0 -27 10 59 21 2 49.5 11 254 -58 -27 26 10 -26 55 52 -27 29 11 -26 52 53 0.77 45 0 0 -26 46 43 21 2 51.1 10 254 -59 -27 1 52 -26 31 37 -27 4 52 -26 28 39 0.78 46 0 0 -26 22 39 21 2 52.5 9 253 -59 -26 37 46 -26 7 35 -26 40 46 -26 4 37 0.78 47 0 0 -25 58 49 21 2 53.8 8 253 -59 -26 13 55 -25 43 47 -26 16 54 -25 40 50 0.79 48 0 0 -25 35 14 21 2 55.0 7 252 -59 -25 50 17 -25 20 14 -25 53 16 -25 17 16 0.80 49 0 0 -25 11 53 21 2 56.0 6 252 -60 -25 26 54 -24 56 55 -25 29 53 -24 53 58 0.81 50 0 0 -24 48 48 21 2 56.8 5 251 -60 -25 3 47 -24 33 51 -25 6 45 -24 30 55 0.82 51 0 0 -24 25 58 21 2 57.6 4 251 -60 -24 40 56 -24 11 4 -24 43 53 -24 8 8 0.84 52 0 0 -24 3 26 21 2 58.2 3 250 -60 -24 18 21 -23 48 33 -24 21 18 -23 45 38 0.88 53 0 0 -23 41 10 21 2 58.6 3 250 -60 -23 56 3 -23 26 20 -23 59 0 -23 23 24 0.93 54 0 0 -23 19 12 21 2 58.9 2 250 -60 -23 34 3 -23 4 24 -23 37 0 -23 1 29 1.07 55 0 0 -22 57 33 21 2 59.1 1 249 -60 -23 12 22 -22 42 47 -23 15 18 -22 39 52 1.70 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 354-165902 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 02 24.1878 DE: -19 17 57.609 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 02 24.1877 DE: -19 17 57.609 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 12.0 * B mag [mag]: 12.2 * Diameter [mas]: 0.00 * 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]: 1.86040 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", 74.751° remarks: * orbital elements for (370)Modestia : Mean anomaly = 320.0998061672 deg Arg. of pericenter = 68.5942332508 deg Long. of node = 290.8795566562 deg Inclination = 7.8621437787 deg Eccentricity = 0.0905035755 Semimajor axis = 2.3244644146 AU Perihelion dist = 2.1140920740 AU Mag: H = 10.71, G = 0.15 Epoch of elements : MJD 60586.87336850 TDT (2024 Oct 03.8734) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,2.54,2024,10,3,20.960848,0.116138,-0.569702,8.959622,1.825737,0.005418,0.000576,0.000000,0.000000 -41.5001,-19.2641,-137.22,-4.41,False UCAC4 354-165902,19.04005220,-19.2993358,12.24,11.96,11.81,0.0,0,,19.06427498,-19.2641478,3.06,2.78,0,0,0 370,Modestia,14.96,41.127,1.8604,0,0,2.991,8.63,,2.4,0 0,319.8569,2024,10,3,68.5942,290.8796,7.8621,0.09050,2.32446,2.11409,10.70,5.0,0.15 1.099,0.0213,0.0027,75,0.0030,Known errors,0.87,0,-1,-1 20241003_165902,60140.61 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:35 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org