IOTA/IOTA-ES occultation update for (4327) Ries / UCAC4 320-119162 event on 2024 Feb 01, 07:37 UT Visible from Summary ------- On 2024 Feb 01 UT, the 14.309 km diameter asteroid (4327) Ries will occult a 10.3 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 7.00 mag to 17.27 mag (the magnitude of the asteroid) for at most 0.360 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 Feb 01, 07:35 - 2024 Feb 01, 07:40 * geocentric midpoint of event [JD]: 2460341.81793263 * magnitude of target star: 10.27 * magnitude drop [mag]: 7.00 * estimated maximum duration [s]: 0.360 * Moon: 66 % sunlit, 61° distance * Sun: 48° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 14 * 1 sigma uncertainty interval [path widths]: +/- 0.32 * 1 sigma uncertainty interval [seconds]: +/- 0.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.001", 108°) * approx speed of asteroid's shadow [km/s]: 39.3311 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 320-119162 by 4327 Ries on 2024 Feb 1 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 - 64 0 0 12 57 1 7 35 7.8 1 117 -45 12 52 39 13 1 23 12 49 54 13 4 8 .... - 63 0 0 12 26 53 7 35 7.9 2 117 -44 12 22 30 12 31 15 12 19 45 12 34 0 0.03 - 62 0 0 11 56 29 7 35 8.0 3 117 -43 11 52 6 12 0 51 11 49 20 12 3 37 0.00 - 61 0 0 11 25 49 7 35 8.2 4 118 -42 11 21 27 11 30 12 11 18 41 11 32 58 -0.01 - 60 0 0 10 54 56 7 35 8.5 5 118 -41 10 50 33 10 59 19 10 47 47 11 2 6 -0.02 - 59 0 0 10 23 49 7 35 8.8 7 118 -40 10 19 26 10 28 13 10 16 39 10 30 59 -0.02 - 58 0 0 9 52 29 7 35 9.2 8 118 -39 9 48 6 9 56 53 9 45 19 9 59 40 -0.03 - 57 0 0 9 20 58 7 35 9.6 9 118 -38 9 16 34 9 25 22 9 13 47 9 28 9 -0.03 - 56 0 0 8 49 15 7 35 10.2 10 119 -36 8 44 51 8 53 39 8 42 4 8 56 26 -0.03 - 55 0 0 8 17 22 7 35 10.7 11 119 -35 8 12 57 8 21 46 8 10 10 8 24 34 -0.04 - 54 0 0 7 45 19 7 35 11.4 12 119 -34 7 40 55 7 49 44 7 38 8 7 52 31 -0.04 - 53 0 0 7 13 8 7 35 12.1 13 119 -33 7 8 44 7 17 33 7 5 56 7 20 21 -0.04 - 52 0 0 6 40 50 7 35 12.8 14 119 -32 6 36 25 6 45 15 6 33 37 6 48 2 -0.04 - 51 0 0 6 8 24 7 35 13.7 16 119 -31 6 3 59 6 12 49 6 1 12 6 15 37 -0.04 - 50 0 0 5 35 53 7 35 14.6 17 119 -30 5 31 28 5 40 18 5 28 40 5 43 6 -0.04 - 49 0 0 5 3 17 7 35 15.5 18 119 -29 4 58 52 5 7 42 4 56 4 5 10 30 -0.04 - 48 0 0 4 30 37 7 35 16.5 19 120 -28 4 26 11 4 35 2 4 23 24 4 37 50 -0.04 - 47 0 0 3 57 54 7 35 17.6 20 120 -27 3 53 28 4 2 19 3 50 41 4 5 7 -0.04 - 46 0 0 3 25 9 7 35 18.7 21 120 -25 3 20 43 3 29 34 3 17 55 3 32 22 -0.04 - 45 0 0 2 52 22 7 35 19.9 22 120 -24 2 47 57 2 56 48 2 45 9 2 59 36 -0.04 - 44 0 0 2 19 36 7 35 21.2 24 120 -23 2 15 11 2 24 2 2 12 23 2 26 49 -0.05 - 43 0 0 1 46 51 7 35 22.5 25 120 -22 1 42 25 1 51 16 1 39 38 1 54 4 -0.05 - 42 0 0 1 14 7 7 35 23.9 26 120 -21 1 9 42 1 18 32 1 6 54 1 21 20 -0.05 - 41 0 0 0 41 26 7 35 25.3 27 120 -20 0 37 1 0 45 52 0 34 14 0 48 39 -0.05 - 40 0 0 0 8 49 7 35 26.8 28 120 -19 0 4 24 0 13 15 0 1 37 0 16 2 -0.05 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48 3 - 8 39 25 - 8 50 47 - 8 36 42 -0.01 109 0 0 - 8 14 46 7 40 31.4 2 244 49 - 8 19 5 - 8 10 26 - 8 21 49 - 8 7 42 0.01 110 0 0 - 7 45 29 7 40 31.5 1 244 48 - 7 49 49 - 7 41 9 - 7 52 33 - 7 38 25 0.11 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 13.1 Data for the target star ------------------------ * name: UCAC4 320-119162 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 31 20.3244 DE: -26 03 21.921 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 31 20.3249 DE: -26 03 21.921 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.3 * B mag [mag]: 10.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4327) Ries asteroid class: approx. diameter [km]: 14 approx. diameter ["]: 0.006 distance from Earth [AU]: 3.13470 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#60 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): 0.013", 0.001", 107.958° remarks: * orbital elements for (4327)Ries : Mean anomaly = 300.0129049957 deg Arg. of pericenter = 276.8322050684 deg Long. of node = 55.7030124789 deg Inclination = 16.6656984908 deg Eccentricity = 0.2241505928 Semimajor axis = 2.7726773318 AU Perihelion dist = 2.1511800644 AU Mag: H = 11.84, G = 0.15 Epoch of elements : MJD 60341.31793250 TDT (2024 Feb 01.3179) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#602023Apr24,0.36,2024,2,1,7.630383,0.010219,0.057188,21.750465,-4.442843,-0.004336,0.000015,-0.000001,0.000000 17.7269,-26.0743,68.91,-17.21,False UCAC4 320-119162,17.52231228,-26.0560891,10.61,10.27,10.09,0.0,0,,17.54683629,-26.0743118,7.00,6.73,0,0,0 4327,Ries,17.27,14.309,3.1347,0,0,4.530,-12.46,,1.0,0 0,299.9450,2024,2,1,276.8322,55.7030,16.6657,0.22415,2.77268,2.15118,11.84,5.0,0.15 1.316,0.0133,0.0013,108,0.0020,Known errors,0.71,0,-1,-1 20240201_119162,60138.15 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 13, 03:35 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org