IOTA/IOTA-ES occultation update for (13) Egeria / UCAC4 628-016995 event on 2024 Dec 10, 08:16 UT Visible from Summary ------- On 2024 Dec 10 UT, the 207.853 km diameter asteroid (13) Egeria will occult a 11.8 mag star in the constellation Perseus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 0.22 mag to 10.19 mag (the magnitude of the asteroid) for at most 17.890 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: 99 * date and approx. time of event: 2024 Dec 10, 08:08 - 2024 Dec 10, 08:25 * geocentric midpoint of event [JD]: 2460654.84492971 * magnitude of target star: 11.83 * magnitude drop [mag]: 0.22 * estimated maximum duration [s]: 17.890 * Moon: 69 % sunlit, 59° distance * Sun: 163° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 230 * 1 sigma uncertainty interval [path widths]: +/- 0.14 * 1 sigma uncertainty interval [seconds]: +/- 2.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.034, +/- 0.025) * 1 sigma uncertainty ellipse (major, minor, PA): (0.036", 0.021", 65°) * approx speed of asteroid's shadow [km/s]: 11.6168 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 628-016995 by 13 Egeria on 2024 Dec 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 106 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. 29 25 40 .. .. .. .... 107 0 0 28 26 44 8 24 58.7 0 49 16 29 49 23 .. .. .. 30 12 33 .. .. .. .... 108 0 0 29 13 15 8 24 58.5 1 49 15 30 35 56 27 51 43 30 59 7 27 29 17 -0.41 109 0 0 29 59 27 8 24 58.0 3 50 14 31 22 11 28 37 54 31 45 22 28 15 28 -0.43 110 0 0 30 45 20 8 24 57.3 4 50 13 32 8 4 29 23 46 32 31 16 29 1 20 -0.43 111 0 0 31 30 51 8 24 56.4 5 51 12 32 53 35 30 9 18 33 16 47 29 46 51 -0.44 112 0 0 32 15 59 8 24 55.3 6 51 11 33 38 42 30 54 27 34 1 53 30 32 1 -0.44 113 0 0 33 0 42 8 24 53.9 7 52 9 34 23 22 31 39 13 34 46 32 31 16 47 -0.44 114 0 0 33 44 58 8 24 52.3 8 52 8 35 7 35 32 23 33 35 30 44 32 1 8 -0.44 115 0 0 34 28 47 8 24 50.5 9 53 7 35 51 19 33 7 26 36 14 27 32 45 2 -0.44 116 0 0 35 12 6 8 24 48.5 10 54 6 36 34 32 33 50 50 36 57 39 33 28 28 -0.44 117 0 0 35 54 54 8 24 46.3 11 54 5 37 17 14 34 33 45 37 40 18 34 11 25 -0.44 118 0 0 36 37 11 8 24 44.0 13 55 4 37 59 23 35 16 9 38 22 25 34 53 51 -0.44 119 0 0 37 18 54 8 24 41.4 14 55 3 38 40 58 35 58 1 39 3 58 35 35 46 -0.45 120 0 0 38 0 4 8 24 38.7 15 56 2 39 21 58 36 39 20 39 44 55 36 17 7 -0.45 121 0 0 38 40 39 8 24 35.8 16 57 1 40 2 22 37 20 5 40 25 16 36 57 55 -0.45 122 0 0 39 20 38 8 24 32.8 17 57 0 40 42 9 38 0 15 41 5 0 37 38 8 -0.45 123 0 0 40 0 0 8 24 29.7 18 58 -1 41 21 19 38 39 49 41 44 7 38 17 45 -0.45 124 0 0 40 38 45 8 24 26.4 19 59 -2 41 59 51 39 18 47 42 22 35 38 56 46 -0.45 125 0 0 41 16 52 8 24 23.0 20 59 -3 42 37 44 39 57 7 43 0 24 39 35 10 -0.45 126 0 0 41 54 20 8 24 19.5 21 60 -4 43 14 58 40 34 50 43 37 33 40 12 57 -0.45 127 0 0 42 31 10 8 24 15.8 21 61 -5 43 51 32 41 11 54 44 14 3 40 50 5 -0.45 128 0 0 43 7 20 8 24 12.1 22 62 -6 44 27 26 41 48 20 44 49 53 41 26 35 -0.45 129 0 0 43 42 50 8 24 8.2 23 62 -7 45 2 39 42 24 6 45 25 2 42 2 26 -0.45 130 0 0 44 17 41 8 24 4.3 24 63 -8 45 37 13 42 59 14 45 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52 26 9 49 15 13 -0.46 144 0 0 51 15 32 8 23 3.4 35 75 -19 52 30 21 50 1 38 52 51 18 49 41 16 -0.46 145 0 0 51 40 31 8 22 58.8 36 76 -19 52 54 59 50 26 58 53 15 49 50 6 41 -0.46 146 0 0 52 4 53 8 22 54.2 37 77 -20 53 18 59 50 51 40 53 39 43 50 31 30 -0.46 147 0 0 52 28 38 8 22 49.6 37 78 -21 53 42 22 51 15 46 54 3 0 50 55 41 -0.46 148 0 0 52 51 46 8 22 45.0 38 79 -21 54 5 9 51 39 16 54 25 42 51 19 16 -0.46 149 0 0 53 14 19 8 22 40.4 39 80 -22 54 27 21 52 2 9 54 47 47 51 42 16 -0.46 150 0 0 53 36 17 8 22 35.8 39 81 -23 54 48 58 52 24 28 55 9 18 52 4 40 -0.46 151 0 0 53 57 40 8 22 31.2 40 82 -23 55 9 59 52 46 11 55 30 13 52 26 29 -0.46 152 0 0 54 18 29 8 22 26.6 40 83 -24 55 30 27 53 7 20 55 50 35 52 47 43 -0.46 153 0 0 54 38 44 8 22 22.0 41 84 -24 55 50 21 53 27 55 56 10 23 53 8 24 -0.46 154 0 0 54 58 26 8 22 17.4 42 85 -25 56 9 42 53 47 57 56 29 39 53 28 31 -0.46 155 0 0 55 17 35 8 22 12.8 42 86 -26 56 28 31 54 7 26 56 48 21 53 48 5 -0.46 156 0 0 55 36 11 8 22 8.2 43 87 -26 56 46 47 54 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89 0 0 47 40 17 8 12 41.6 52 270 -52 48 57 44 46 23 52 49 19 25 46 2 50 -0.47 - 88 0 0 47 9 59 8 12 34.7 52 271 -52 48 27 44 45 53 15 48 49 31 45 32 8 -0.47 - 87 0 0 46 39 2 8 12 27.7 51 272 -51 47 57 6 45 22 0 48 18 58 45 0 48 -0.47 - 86 0 0 46 7 26 8 12 20.7 50 274 -51 47 25 48 44 50 7 47 47 46 44 28 50 -0.47 - 85 0 0 45 35 11 8 12 13.7 49 275 -51 46 53 52 44 17 35 47 15 54 43 56 13 -0.47 - 84 0 0 45 2 18 8 12 6.7 49 276 -50 46 21 16 43 44 26 46 43 23 43 22 59 -0.47 - 83 0 0 44 28 47 8 11 59.6 48 277 -50 45 48 1 43 10 38 46 10 13 42 49 7 -0.46 - 82 0 0 43 54 37 8 11 52.6 47 279 -49 45 14 7 42 36 12 45 36 24 42 14 37 -0.46 - 81 0 0 43 19 48 8 11 45.5 46 280 -49 44 39 35 42 1 9 45 1 56 41 39 30 -0.46 - 80 0 0 42 44 22 8 11 38.5 46 281 -48 44 4 24 41 25 29 44 26 49 41 3 46 -0.46 - 79 0 0 42 8 19 8 11 31.4 45 282 -48 43 28 34 40 49 11 43 51 4 40 27 25 -0.46 - 78 0 0 41 31 38 8 11 24.4 44 283 -47 42 52 7 40 12 18 43 14 41 39 50 27 -0.46 - 77 0 0 40 54 21 8 11 17.4 43 284 -46 42 15 2 39 34 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22 4 0 8 8 48.3 16 303 -23 23 24 50 20 44 16 23 47 28 20 22 18 -0.47 - 50 0 0 21 17 23 8 8 45.0 15 303 -22 22 38 0 19 57 51 23 0 36 19 35 57 -0.48 - 49 0 0 20 30 49 8 8 41.8 14 303 -21 21 51 13 19 11 29 22 13 45 18 49 39 -0.48 - 48 0 0 19 44 20 8 8 39.0 12 304 -20 21 4 30 18 25 13 21 26 58 18 3 26 -0.48 - 47 0 0 18 57 57 8 8 36.3 11 304 -19 20 17 53 17 39 5 20 40 17 17 17 22 -0.49 - 46 0 0 18 11 43 8 8 34.0 10 304 -18 19 31 24 16 53 6 19 53 43 16 31 26 -0.49 - 45 0 0 17 25 40 8 8 31.9 9 305 -17 18 45 4 16 7 17 19 7 19 15 45 42 -0.50 - 44 0 0 16 39 49 8 8 30.1 7 305 -15 17 58 57 15 21 42 18 21 6 15 0 11 -0.51 - 43 0 0 15 54 12 8 8 28.5 6 305 -14 17 13 3 14 36 22 17 35 7 14 14 55 -0.52 - 42 0 0 15 8 51 8 8 27.2 5 306 -13 16 27 24 13 51 18 16 49 24 13 29 56 -0.54 - 41 0 0 14 23 48 8 8 26.2 4 306 -12 15 42 2 13 6 32 16 3 57 12 45 15 -0.57 - 40 0 0 13 39 4 8 8 25.5 3 306 -11 14 57 0 12 22 7 15 18 49 12 0 54 -0.62 - 39 0 0 12 54 42 8 8 25.0 1 306 -10 14 12 18 11 38 3 14 34 2 11 16 55 -0.78 - 38 0 0 12 10 42 8 8 24.8 0 306 -8 13 27 59 .. .. .. 13 49 37 .. .. .. -2.95 Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 628-016995 * constellation : Perseus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 04 18 37.0062 DE: +35 31 15.449 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 04 18 37.0062 DE: +35 31 15.449 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.8 * B mag [mag]: 12.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (13) Egeria asteroid class: approx. diameter [km]: 208 approx. diameter ["]: 0.196 distance from Earth [AU]: 1.46240 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#113 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): 0.036", 0.021", 64.581° remarks: * orbital elements for (13)Egeria : Mean anomaly = 318.5623718951 deg Arg. of pericenter = 79.1383818077 deg Long. of node = 43.2042701859 deg Inclination = 16.5294280945 deg Eccentricity = 0.0853490476 Semimajor axis = 2.5779033281 AU Perihelion dist = 2.3578817343 AU Mag: H = 6.95, G = 0.15 Epoch of elements : MJD 60654.34492966 TDT (2024 Dec 10.3449) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1132023Apr24,17.89,2024,12,10,8.278313,0.075841,0.417286,-6.451158,1.172591,0.001205,-0.001180,0.000001,0.000000 -138.6604,35.5833,54.06,-22.96,False UCAC4 628-016995,4.31027950,35.5209581,12.62,11.83,11.40,0.0,0,,4.33794749,35.5832826,0.22,0.21,0,0,0 13,Egeria,10.19,207.853,1.4624,0,0,-3.179,7.04,,13.8,0 0,318.4802,2024,12,10,79.1384,43.2043,16.5294,0.08535,2.57790,2.35788,6.94,5.0,0.15 1.139,0.0363,0.0210,65,0.0272,Known errors,1.77,0,-1,-1 20241210_016995,60140.73 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org