IOTA/IOTA-ES occultation update for (571) Dulcinea / UCAC4 314-100266 event on 2024 Oct 10, 18:25 UT Visible from Summary ------- On 2024 Oct 10 UT, the 12.669 km diameter asteroid (571) Dulcinea will occult a 10.7 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 6.31 mag to 16.99 mag (the magnitude of the asteroid) for at most 0.410 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 10, 18:22 - 2024 Oct 10, 18:29 * geocentric midpoint of event [JD]: 2460594.26793200 * magnitude of target star: 10.68 * magnitude drop [mag]: 6.31 * estimated maximum duration [s]: 0.410 * Moon: 50 % sunlit, 30° distance * Sun: 60° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 13 * 1 sigma uncertainty interval [path widths]: +/- 0.23 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.009, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.009", 0.001", 98°) * approx speed of asteroid's shadow [km/s]: 30.8158 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 314-100266 by 571 Dulcinea on 2024 Oct 10 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 -132 0 0 - 5 39 36 18 22 24.6 0 118 57 - 5 43 32 - 5 35 41 - 5 45 19 - 5 33 53 .... -131 0 0 - 6 11 2 18 22 24.7 1 117 58 - 6 14 58 - 6 7 6 - 6 16 45 - 6 5 19 0.21 -130 0 0 - 6 42 31 18 22 24.8 3 117 59 - 6 46 27 - 6 38 35 - 6 48 15 - 6 36 48 0.19 -129 0 0 - 7 14 3 18 22 25.0 4 117 60 - 7 17 59 - 7 10 7 - 7 19 47 - 7 8 19 0.18 -128 0 0 - 7 45 37 18 22 25.3 5 117 61 - 7 49 33 - 7 41 41 - 7 51 21 - 7 39 53 0.17 -127 0 0 - 8 17 11 18 22 25.7 6 117 62 - 8 21 7 - 8 13 15 - 8 22 55 - 8 11 27 0.17 -126 0 0 - 8 48 46 18 22 26.2 7 117 63 - 8 52 42 - 8 44 50 - 8 54 30 - 8 43 2 0.17 -125 0 0 - 9 20 20 18 22 26.7 8 117 64 - 9 24 16 - 9 16 24 - 9 26 4 - 9 14 36 0.17 -124 0 0 - 9 51 51 18 22 27.3 9 116 65 - 9 55 48 - 9 47 55 - 9 57 36 - 9 46 7 0.16 -123 0 0 -10 23 20 18 22 28.0 10 116 66 -10 27 17 -10 19 24 -10 29 5 -10 17 36 0.16 -122 0 0 -10 54 46 18 22 28.8 11 116 67 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43 50 -18 36 4 -18 45 36 -18 34 17 0.17 37 0 0 -18 11 17 18 29 3.1 19 246 -41 -18 15 10 -18 7 24 -18 16 57 -18 5 37 0.17 38 0 0 -17 42 21 18 29 4.3 17 246 -42 -17 46 15 -17 38 28 -17 48 2 -17 36 41 0.17 39 0 0 -17 13 11 18 29 5.5 16 246 -43 -17 17 5 -17 9 17 -17 18 52 -17 7 30 0.17 40 0 0 -16 43 45 18 29 6.5 15 245 -44 -16 47 40 -16 39 51 -16 49 27 -16 38 4 0.17 41 0 0 -16 14 6 18 29 7.6 14 245 -45 -16 18 1 -16 10 12 -16 19 48 -16 8 25 0.17 42 0 0 -15 44 14 18 29 8.5 13 245 -47 -15 48 9 -15 40 19 -15 49 56 -15 38 32 0.17 43 0 0 -15 14 10 18 29 9.4 12 245 -48 -15 18 5 -15 10 15 -15 19 52 -15 8 27 0.18 44 0 0 -14 43 54 18 29 10.2 11 244 -49 -14 47 49 -14 39 59 -14 49 36 -14 38 11 0.18 45 0 0 -14 13 27 18 29 10.9 10 244 -50 -14 17 22 -14 9 32 -14 19 10 -14 7 44 0.18 46 0 0 -13 42 50 18 29 11.5 9 244 -51 -13 46 46 -13 38 55 -13 48 33 -13 37 7 0.18 47 0 0 -13 12 4 18 29 12.1 8 244 -52 -13 16 0 -13 8 9 -13 17 48 -13 6 21 0.19 48 0 0 -12 41 10 18 29 12.6 7 243 -53 -12 45 6 -12 37 14 -12 46 54 -12 35 27 0.19 49 0 0 -12 10 9 18 29 13.0 5 243 -54 -12 14 4 -12 6 13 -12 15 52 -12 4 25 0.20 50 0 0 -11 39 0 18 29 13.4 4 243 -55 -11 42 56 -11 35 4 -11 44 44 -11 33 17 0.21 51 0 0 -11 7 46 18 29 13.7 3 243 -56 -11 11 42 -11 3 50 -11 13 30 -11 2 3 0.23 52 0 0 -10 36 28 18 29 13.9 2 243 -58 -10 40 24 -10 32 32 -10 42 12 -10 30 44 0.27 53 0 0 -10 5 5 18 29 14.0 1 242 -59 -10 9 1 -10 1 9 -10 10 49 - 9 59 21 0.40 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 314-100266 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 02 44.2451 DE: -27 22 55.388 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 02 44.2449 DE: -27 22 55.387 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.7 * B mag [mag]: 10.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (571) Dulcinea asteroid class: approx. diameter [km]: 13 approx. diameter ["]: 0.006 distance from Earth [AU]: 2.85830 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#59 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): 0.009", 0.001", 97.992° remarks: * orbital elements for (571)Dulcinea : Mean anomaly = 274.0435902413 deg Arg. of pericenter = 27.5793088151 deg Long. of node = 3.1218978889 deg Inclination = 5.2270301612 deg Eccentricity = 0.2429517691 Semimajor axis = 2.4103103789 AU Perihelion dist = 1.8247212082 AU Mag: H = 11.72, G = 0.15 Epoch of elements : MJD 60593.76793187 TDT (2024 Oct 10.7679) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#592023Apr24,0.41,2024,10,10,18.430368,-0.005821,-0.147336,17.379493,-0.693405,0.004827,-0.000695,-0.000001,0.000000 -40.2360,-27.4183,-99.75,-7.04,False UCAC4 314-100266,17.04562368,-27.3820522,10.91,10.68,10.56,0.0,0,,17.07110886,-27.4182777,6.31,5.99,0,0,0 571,Dulcinea,16.99,12.669,2.8583,0,0,4.017,-2.13,,0.8,0 0,273.8413,2024,10,10,27.5793,3.1219,5.2270,0.24295,2.41031,1.82472,11.71,5.0,0.15 1.229,0.0087,0.0011,98,0.0014,Known errors,0.86,0,-1,-1 20241010_100266,60140.62 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:59 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org