IOTA/IOTA-ES occultation update for (2417) McVittie / UCAC4 380-166434 event on 2024 Dec 21, 06:09 UT Visible from Summary ------- On 2024 Dec 21 UT, the 18.481 km diameter asteroid (2417) McVittie will occult a 11.8 mag star in the constellation Aquarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.89 mag to 18.71 mag (the magnitude of the asteroid) for at most 0.640 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 Dec 21, 06:06 - 2024 Dec 21, 06:13 * geocentric midpoint of event [JD]: 2460665.75679359 * magnitude of target star: 11.82 * magnitude drop [mag]: 6.89 * estimated maximum duration [s]: 0.640 * Moon: 66 % sunlit, 169° distance * Sun: 61° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 18 * 1 sigma uncertainty interval [path widths]: +/- 0.20 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.001", 70°) * approx speed of asteroid's shadow [km/s]: 28.9213 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 380-166434 by 2417 McVittie on 2024 Dec 21 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 57 0 0 -20 37 51 6 6 6.7 1 105 61 -20 43 2 -20 32 40 -20 45 5 -20 30 37 .... 58 0 0 -20 52 22 6 6 6.8 2 104 62 -20 57 33 -20 47 12 -20 59 36 -20 45 9 0.03 59 0 0 -21 6 28 6 6 6.9 3 104 63 -21 11 38 -21 1 19 -21 13 41 -20 59 16 0.01 60 0 0 -21 20 9 6 6 7.1 4 104 64 -21 25 18 -21 15 0 -21 27 21 -21 12 57 0.00 61 0 0 -21 33 24 6 6 7.4 4 103 65 -21 38 33 -21 28 16 -21 40 35 -21 26 13 -0.01 62 0 0 -21 46 14 6 6 7.7 5 103 66 -21 51 22 -21 41 6 -21 53 24 -21 39 3 -0.01 63 0 0 -21 58 38 6 6 8.1 6 102 67 -22 3 45 -21 53 30 -22 5 48 -21 51 28 -0.01 64 0 0 -22 10 36 6 6 8.5 7 102 68 -22 15 43 -22 5 29 -22 17 45 -22 3 27 -0.02 65 0 0 -22 22 9 6 6 9.0 8 102 69 -22 27 16 -22 17 2 -22 29 17 -22 15 0 -0.02 66 0 0 -22 33 16 6 6 9.5 9 101 70 -22 38 22 -22 28 10 -22 40 24 -22 26 8 -0.02 67 0 0 -22 43 57 6 6 10.2 10 101 71 -22 49 3 -22 38 51 -22 51 5 -22 36 50 -0.02 68 0 0 -22 54 13 6 6 10.8 11 101 72 -22 59 18 -22 49 8 -23 1 20 -22 47 6 -0.02 69 0 0 -23 4 3 6 6 11.6 12 100 72 -23 9 8 -22 58 58 -23 11 9 -22 56 57 -0.02 70 0 0 -23 13 27 6 6 12.3 13 100 73 -23 18 31 -23 8 22 -23 20 32 -23 6 21 -0.02 71 0 0 -23 22 25 6 6 13.2 14 99 74 -23 27 29 -23 17 21 -23 29 30 -23 15 20 -0.02 72 0 0 -23 30 57 6 6 14.1 15 99 75 -23 36 1 -23 25 54 -23 38 2 -23 23 53 -0.02 73 0 0 -23 39 4 6 6 15.0 16 99 76 -23 44 7 -23 34 0 -23 46 8 -23 32 0 -0.03 74 0 0 -23 46 45 6 6 16.0 17 98 77 -23 51 48 -23 41 41 -23 53 48 -23 39 41 -0.03 75 0 0 -23 54 0 6 6 17.1 18 98 78 -23 59 2 -23 48 57 -24 1 3 -23 46 56 -0.03 76 0 0 -24 0 49 6 6 18.2 19 97 79 -24 5 51 -23 55 46 -24 7 51 -23 53 46 -0.03 77 0 0 -24 7 12 6 6 19.3 19 97 80 -24 12 14 -24 2 9 -24 14 14 -24 0 9 -0.03 78 0 0 -24 13 9 6 6 20.6 20 97 81 -24 18 11 -24 8 7 -24 20 11 -24 6 7 -0.03 79 0 0 -24 18 40 6 6 21.8 21 96 82 -24 23 42 -24 13 39 -24 25 42 -24 11 39 -0.03 80 0 0 -24 23 46 6 6 23.1 22 96 82 -24 28 48 -24 18 44 -24 30 47 -24 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249 -46 19 29 21 19 40 2 19 27 13 19 42 9 -0.02 -140 0 0 19 55 29 6 13 21.5 13 250 -47 19 50 9 20 0 48 19 48 2 20 2 55 -0.02 -139 0 0 20 15 52 6 13 22.4 12 250 -48 20 10 33 20 21 11 20 8 26 20 23 18 -0.02 -138 0 0 20 35 51 6 13 23.2 11 250 -49 20 30 33 20 41 10 20 28 26 20 43 17 -0.02 -137 0 0 20 55 27 6 13 23.9 10 251 -50 20 50 9 21 0 44 20 48 2 21 2 51 -0.02 -136 0 0 21 14 37 6 13 24.5 9 251 -51 21 9 20 21 19 55 21 7 14 21 22 1 -0.02 -135 0 0 21 33 24 6 13 25.1 8 251 -52 21 28 7 21 38 40 21 26 1 21 40 46 -0.01 -134 0 0 21 51 45 6 13 25.6 7 252 -53 21 46 29 21 57 1 21 44 24 21 59 7 -0.01 -133 0 0 22 9 42 6 13 26.0 6 252 -54 22 4 27 22 14 58 22 2 22 22 17 3 -0.01 -132 0 0 22 27 14 6 13 26.4 5 253 -55 22 22 0 22 32 29 22 19 55 22 34 34 -0.01 -131 0 0 22 44 21 6 13 26.7 4 253 -56 22 39 7 22 49 36 22 37 3 22 51 40 -0.01 -130 0 0 23 1 4 6 13 26.9 3 253 -57 22 55 50 23 6 17 22 53 46 23 8 22 0.00 -129 0 0 23 17 21 6 13 27.1 2 254 -58 23 12 8 23 22 34 23 10 4 23 24 38 0.01 -128 0 0 23 33 13 6 13 27.2 1 254 -59 23 28 1 23 38 25 23 25 56 23 40 29 0.03 -127 0 0 23 48 40 6 13 27.3 0 255 -60 23 43 28 23 53 52 23 41 24 23 55 55 0.14 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 380-166434 * constellation : Aquarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 22 12 29.4808 DE: -14 02 21.982 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 22 12 29.4808 DE: -14 02 21.983 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.8 * B mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2417) McVittie asteroid class: approx. diameter [km]: 18 approx. diameter ["]: 0.007 distance from Earth [AU]: 3.76050 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#46 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): 0.014", 0.001", 70.258° remarks: * orbital elements for (2417)McVittie : Mean anomaly = 265.3238430375 deg Arg. of pericenter = 19.2808814158 deg Long. of node = 84.5394976401 deg Inclination = 3.1089347268 deg Eccentricity = 0.2255615054 Semimajor axis = 3.1769937632 AU Perihelion dist = 2.4603862674 AU Mag: H = 12.36, G = 0.15 Epoch of elements : MJD 60665.25679338 TDT (2024 Dec 21.2568) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#462023Apr24,0.64,2024,12,21,6.163046,-0.012263,0.028668,15.051223,6.319224,0.004996,0.001751,-0.000001,0.000000 150.6999,-13.9176,87.10,-23.44,False UCAC4 380-166434,22.20818915,-14.0394394,12.30,11.82,11.56,0.0,0,,22.23040553,-13.9176172,6.89,6.70,0,0,0 2417,McVittie,18.71,18.481,3.7605,0,0,2.418,14.78,,1.8,0 0,265.2791,2024,12,21,19.2809,84.5395,3.1089,0.22556,3.17699,2.46039,12.36,5.0,0.15 1.199,0.0143,0.0011,70,0.0014,Known errors,1.18,0,-1,-1 20241221_166434,60140.75 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:58 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org