IOTA/IOTA-ES occultation update for (9984) Gregbryant / UCAC4 349-172650 event on 2024 Oct 03, 01:27 UT Visible from Summary ------- On 2024 Oct 03 UT, the 11.957 km diameter asteroid (9984) Gregbryant will occult a 11.7 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 6.50 mag to 18.24 mag (the magnitude of the asteroid) for at most 0.890 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: 96 * date and approx. time of event: 2024 Oct 03, 01:19 - 2024 Oct 03, 01:35 * geocentric midpoint of event [JD]: 2460586.56073617 * magnitude of target star: 11.74 * magnitude drop [mag]: 6.50 * estimated maximum duration [s]: 0.890 * Moon: 0 % sunlit, 96° distance * Sun: 99° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 0.42 * 1 sigma uncertainty interval [seconds]: +/- 1.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.003", 78°) * approx speed of asteroid's shadow [km/s]: 13.4133 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 349-172650 by 9984 Gregbryant 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 170 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. 4 5 34 .. .. .. .... 171 0 0 3 49 57 1 19 47.1 1 110 74 3 46 24 3 53 30 3 43 25 3 56 29 .... 172 0 0 3 28 1 1 19 47.3 2 110 73 3 24 28 3 31 34 3 21 30 3 34 33 -0.12 173 0 0 3 6 19 1 19 47.7 3 110 73 3 2 46 3 9 52 2 59 48 3 12 50 -0.16 174 0 0 2 44 51 1 19 48.3 4 111 72 2 41 19 2 48 24 2 38 21 2 51 22 -0.18 175 0 0 2 23 38 1 19 49.1 5 111 71 2 20 6 2 27 10 2 17 8 2 30 8 -0.20 176 0 0 2 2 40 1 19 50.0 6 111 70 1 59 8 2 6 12 1 56 11 2 9 10 -0.21 177 0 0 1 41 58 1 19 51.1 7 111 69 1 38 26 1 45 30 1 35 29 1 48 27 -0.21 178 0 0 1 21 32 1 19 52.3 8 111 69 1 18 0 1 25 3 1 15 3 1 28 0 -0.22 179 0 0 1 1 22 1 19 53.8 10 111 68 0 57 51 1 4 53 0 54 54 1 7 50 -0.22 -180 0 0 0 41 29 1 19 55.3 11 111 67 0 37 58 0 45 0 0 35 2 0 47 56 -0.22 -179 0 0 0 21 54 1 19 57.1 12 111 66 0 18 23 0 25 24 0 15 27 0 28 20 -0.22 -178 0 0 0 2 36 1 19 59.0 13 111 65 - 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39 0 0 16 57 24 1 34 51.1 15 243 -72 16 53 46 17 1 2 16 50 43 17 4 4 -0.24 - 38 0 0 17 22 18 1 34 53.4 14 243 -73 17 18 40 17 25 56 17 15 37 17 28 58 -0.24 - 37 0 0 17 47 5 1 34 55.5 13 244 -73 17 43 27 17 50 43 17 40 25 17 53 45 -0.24 - 36 0 0 18 11 45 1 34 57.4 12 244 -73 18 8 7 18 15 22 18 5 5 18 18 25 -0.24 - 35 0 0 18 36 17 1 34 59.2 11 244 -73 18 32 39 18 39 54 18 29 37 18 42 57 -0.24 - 34 0 0 19 0 40 1 35 0.8 10 244 -73 18 57 3 19 4 18 18 54 1 19 7 20 -0.24 - 33 0 0 19 24 55 1 35 2.2 9 245 -73 19 21 18 19 28 33 19 18 16 19 31 35 -0.24 - 32 0 0 19 49 0 1 35 3.5 8 245 -73 19 45 23 19 52 38 19 42 21 19 55 40 -0.24 - 31 0 0 20 12 56 1 35 4.6 7 246 -73 20 9 19 20 16 33 20 6 17 20 19 35 -0.24 - 30 0 0 20 36 41 1 35 5.6 6 246 -73 20 33 4 20 40 18 20 30 2 20 43 20 -0.24 - 29 0 0 21 0 15 1 35 6.4 5 246 -73 20 56 38 21 3 52 20 53 37 21 6 53 -0.24 - 28 0 0 21 23 38 1 35 7.0 4 247 -73 21 20 1 21 27 14 21 17 0 21 30 16 -0.24 - 27 0 0 21 46 48 1 35 7.5 3 247 -72 21 43 12 21 50 25 21 40 11 21 53 26 -0.24 - 26 0 0 22 9 47 1 35 7.8 2 247 -72 22 6 11 22 13 23 22 3 10 22 16 24 -0.23 - 25 0 0 22 32 32 1 35 8.0 1 248 -72 22 28 56 22 36 9 22 25 56 22 39 9 -0.22 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 349-172650 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 21 15.2656 DE: -20 15 41.161 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 21 15.2656 DE: -20 15 41.161 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.7 * B mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (9984) Gregbryant asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.008 distance from Earth [AU]: 2.13090 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#45 date of fit: 2023 Apr 25 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): 0.013", 0.003", 77.755° remarks: * orbital elements for (9984)Gregbryant : Mean anomaly = 88.7740395271 deg Arg. of pericenter = 290.5461112350 deg Long. of node = 287.9705878868 deg Inclination = 3.8147345521 deg Eccentricity = 0.0449588627 Semimajor axis = 2.4894222265 AU Perihelion dist = 2.3775006345 AU Mag: H = 13.51, G = 0.15 Epoch of elements : MJD 60586.06073633 TDT (2024 Oct 03.0607) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#452023Apr25,0.89,2024,10,3,1.457668,-0.042867,0.244214,7.457708,1.303923,0.005536,0.000757,0.000000,0.000000 -103.4367,-20.2155,155.39,-4.09,False UCAC4 349-172650,19.35424047,-20.2614336,12.32,11.74,11.43,0.0,0,,19.37858521,-20.2155053,6.50,6.37,0,0,0 9984,Gregbryant,18.24,11.957,2.1309,0,0,2.187,5.38,,1.6,0 0,88.5079,2024,10,2,290.5461,287.9706,3.8147,0.04496,2.48942,2.37750,13.51,5.0,0.15 1.418,0.0130,0.0032,78,0.0033,Known errors,0.86,0,-1,-1 20241003_172650,60140.61 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:32 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org