IOTA/IOTA-ES occultation update for (335) Roberta / TYC 5815-00428-1 event on 2024 Dec 28, 17:33 UT Visible from Summary ------- On 2024 Dec 28 UT, the 95.691 km diameter asteroid (335) Roberta will occult a 9.9 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 4.14 mag to 14.01 mag (the magnitude of the asteroid) for at most 2.730 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: 100 * date and approx. time of event: 2024 Dec 28, 17:30 - 2024 Dec 28, 17:35 * geocentric midpoint of event [JD]: 2460673.23128963 * magnitude of target star: 9.89 * magnitude drop [mag]: 4.14 * estimated maximum duration [s]: 2.730 * Moon: 6 % sunlit, 87° distance * Sun: 60° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 123 * 1 sigma uncertainty interval [path widths]: +/- 0.04 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.002", 73°) * approx speed of asteroid's shadow [km/s]: 35.0690 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5815-00428-1 by 335 Roberta on 2024 Dec 28 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 -128 0 0 -58 5 26 17 30 42.3 0 111 42 -58 41 12 .. .. .. -58 44 18 .. .. .. .... -127 0 0 -58 17 21 17 30 42.3 1 110 43 -58 53 1 -57 41 59 -58 56 7 -57 38 58 0.65 -126 0 0 -58 28 57 17 30 42.4 1 109 43 -59 4 32 -57 53 41 -59 7 36 -57 50 40 0.73 -125 0 0 -58 40 14 17 30 42.4 2 108 43 -59 15 44 -58 5 4 -59 18 48 -58 2 3 0.75 -124 0 0 -58 51 13 17 30 42.5 2 107 44 -59 26 37 -58 16 8 -59 29 41 -58 13 8 0.77 -123 0 0 -59 1 54 17 30 42.6 3 106 44 -59 37 13 -58 26 54 -59 40 16 -58 23 54 0.78 -122 0 0 -59 12 17 17 30 42.7 3 106 44 -59 47 30 -58 37 22 -59 50 32 -58 34 22 0.78 -121 0 0 -59 22 21 17 30 42.9 4 105 45 -59 57 29 -58 47 31 -60 0 31 -58 44 32 0.79 -120 0 0 -59 32 8 17 30 43.0 4 104 45 -60 7 10 -58 57 23 -60 10 12 -58 54 24 0.79 -119 0 0 -59 41 36 17 30 43.2 5 103 45 -60 16 34 -59 6 57 -60 19 35 -59 3 59 0.79 -118 0 0 -59 50 48 17 30 43.4 5 102 46 -60 25 40 -59 16 13 -60 28 41 -59 13 15 0.79 -117 0 0 -59 59 41 17 30 43.6 6 101 46 -60 34 29 -59 25 11 -60 37 29 -59 22 14 0.79 -116 0 0 -60 8 17 17 30 43.9 7 100 46 -60 43 0 -59 33 52 -60 46 0 -59 30 55 0.80 -115 0 0 -60 16 36 17 30 44.1 7 99 46 -60 51 14 -59 42 15 -60 54 14 -59 39 19 0.80 -114 0 0 -60 24 38 17 30 44.4 8 99 47 -60 59 12 -59 50 22 -61 2 11 -59 47 25 0.80 -113 0 0 -60 32 23 17 30 44.7 8 98 47 -61 6 52 -59 58 11 -61 9 51 -59 55 15 0.80 -112 0 0 -60 39 51 17 30 45.0 9 97 47 -61 14 16 -60 5 43 -61 17 14 -60 2 47 0.80 -111 0 0 -60 47 2 17 30 45.3 9 96 47 -61 21 22 -60 12 58 -61 24 20 -60 10 3 0.80 -110 0 0 -60 53 56 17 30 45.6 10 95 48 -61 28 13 -60 19 56 -61 31 10 -60 17 2 0.80 -109 0 0 -61 0 34 17 30 46.0 10 94 48 -61 34 47 -60 26 38 -61 37 44 -60 23 44 0.80 -108 0 0 -61 6 56 17 30 46.3 11 93 48 -61 41 4 -60 33 4 -61 44 2 -60 30 9 0.80 -107 0 0 -61 13 1 17 30 46.7 11 92 48 -61 47 6 -60 39 12 -61 50 3 -60 36 19 0.80 -106 0 0 -61 18 50 17 30 47.1 12 92 49 -61 52 51 -60 45 5 -61 55 48 -60 42 11 0.80 -105 0 0 -61 24 23 17 30 47.5 12 91 49 -61 58 21 -60 50 41 -62 1 17 -60 47 48 0.80 -104 0 0 -61 29 40 17 30 48.0 12 90 49 -62 3 35 -60 56 1 -62 6 30 -60 53 8 0.80 -103 0 0 -61 34 41 17 30 48.4 13 89 49 -62 8 33 -61 1 5 -62 11 28 -60 58 13 0.80 -102 0 0 -61 39 26 17 30 48.9 13 88 49 -62 13 15 -61 5 54 -62 16 10 -61 3 1 0.80 -101 0 0 -61 43 56 17 30 49.3 14 87 49 -62 17 42 -61 10 26 -62 20 37 -61 7 34 0.80 -100 0 0 -61 48 10 17 30 49.8 14 86 50 -62 21 53 -61 14 43 -62 24 48 -61 11 51 0.80 - 99 0 0 -61 52 8 17 30 50.3 15 85 50 -62 25 49 -61 18 43 -62 28 43 -61 15 52 0.80 - 98 0 0 -61 55 51 17 30 50.8 15 84 50 -62 29 29 -61 22 29 -62 32 23 -61 19 37 0.80 - 97 0 0 -61 59 18 17 30 51.3 16 83 50 -62 32 54 -61 25 58 -62 35 49 -61 23 7 0.80 - 96 0 0 -62 2 31 17 30 51.9 16 83 50 -62 36 4 -61 29 13 -62 38 58 -61 26 21 0.80 - 95 0 0 -62 5 27 17 30 52.4 17 82 50 -62 38 59 -61 32 11 -62 41 53 -61 29 20 0.80 - 94 0 0 -62 8 9 17 30 53.0 17 81 50 -62 41 39 -61 34 55 -62 44 33 -61 32 4 0.80 - 93 0 0 -62 10 36 17 30 53.6 18 80 50 -62 44 4 -61 37 23 -62 46 58 -61 34 32 0.80 - 92 0 0 -62 12 47 17 30 54.2 18 79 50 -62 46 14 -61 39 36 -62 49 7 -61 36 45 0.80 - 91 0 0 -62 14 43 17 30 54.8 19 78 51 -62 48 9 -61 41 33 -62 51 2 -61 38 43 0.80 - 90 0 0 -62 16 25 17 30 55.4 19 77 51 -62 49 49 -61 43 16 -62 52 42 -61 40 25 0.80 - 89 0 0 -62 17 51 17 30 56.0 19 76 51 -62 51 14 -61 44 43 -62 54 8 -61 41 53 0.80 - 88 0 0 -62 19 2 17 30 56.6 20 75 51 -62 52 25 -61 45 55 -62 55 18 -61 43 5 0.80 - 87 0 0 -62 19 59 17 30 57.3 20 74 51 -62 53 21 -61 46 52 -62 56 14 -61 44 2 0.80 - 86 0 0 -62 20 40 17 30 58.0 21 73 51 -62 54 1 -61 47 34 -62 56 54 -61 44 44 0.80 - 85 0 0 -62 21 6 17 30 58.7 21 72 51 -62 54 28 -61 48 1 -62 57 20 -61 45 11 0.80 - 84 0 0 -62 21 18 17 30 59.4 22 71 51 -62 54 39 -61 48 13 -62 57 32 -61 45 23 0.80 - 83 0 0 -62 21 15 17 31 0.1 22 70 51 -62 54 36 -61 48 9 -62 57 28 -61 45 19 0.80 - 82 0 0 -62 20 56 17 31 0.8 23 69 51 -62 54 17 -61 47 51 -62 57 10 -61 45 1 0.80 - 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28 -22 31 8 0.84 54 0 0 -22 49 36 17 35 13.8 18 265 -28 -23 25 16 -22 14 14 -23 28 21 -22 11 13 0.84 55 0 0 -22 29 59 17 35 15.0 17 265 -29 -23 5 33 -21 54 43 -23 8 38 -21 51 42 0.84 56 0 0 -22 10 47 17 35 16.1 16 264 -30 -22 46 16 -21 35 36 -22 49 20 -21 32 36 0.84 57 0 0 -21 52 0 17 35 17.1 15 264 -31 -22 27 24 -21 16 55 -22 30 27 -21 13 54 0.85 58 0 0 -21 33 38 17 35 18.1 14 264 -32 -22 8 57 -20 58 38 -22 12 0 -20 55 38 0.85 59 0 0 -21 15 43 17 35 19.0 13 263 -32 -21 50 56 -20 40 48 -21 53 58 -20 37 48 0.85 60 0 0 -20 58 13 17 35 19.9 12 263 -33 -21 33 21 -20 23 23 -21 36 23 -20 20 24 0.86 61 0 0 -20 41 10 17 35 20.7 11 262 -34 -21 16 13 -20 6 25 -21 19 14 -20 3 26 0.86 62 0 0 -20 24 33 17 35 21.4 10 262 -35 -20 59 31 -19 49 53 -21 2 33 -19 46 55 0.86 63 0 0 -20 8 24 17 35 22.0 9 262 -36 -20 43 17 -19 33 48 -20 46 18 -19 30 50 0.87 64 0 0 -19 52 42 17 35 22.6 8 261 -37 -20 27 30 -19 18 11 -20 30 31 -19 15 13 0.88 65 0 0 -19 37 27 17 35 23.1 7 261 -37 -20 12 11 -19 3 1 -20 15 11 -19 0 4 0.88 66 0 0 -19 22 40 17 35 23.6 6 261 -38 -19 57 20 -18 48 18 -20 0 20 -18 45 22 0.90 67 0 0 -19 8 22 17 35 24.0 5 260 -39 -19 42 57 -18 34 4 -19 45 56 -18 31 8 0.91 68 0 0 -18 54 31 17 35 24.3 4 260 -40 -19 29 2 -18 20 18 -19 32 1 -18 17 22 0.94 69 0 0 -18 41 10 17 35 24.5 3 260 -40 -19 15 36 -18 7 0 -19 18 35 -18 4 4 0.97 70 0 0 -18 28 16 17 35 24.7 2 259 -41 -19 2 39 -17 54 11 -19 5 37 -17 51 15 1.05 71 0 0 -18 15 52 17 35 24.8 1 259 -42 -18 50 11 -17 41 50 -18 53 9 -17 38 55 1.26 72 0 0 -18 3 57 17 35 24.9 0 259 -42 -18 38 12 .. .. .. -18 41 10 .. .. .. 5.03 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.8 Data for the target star ------------------------ * name: TYC 5815-00428-1 * constellation : Aquarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 22 39 03.0688 DE: -10 59 43.190 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 22 39 03.0686 DE: -10 59 43.191 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 9.9 * B mag [mag]: 10.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (335) Roberta asteroid class: approx. diameter [km]: 96 approx. diameter ["]: 0.051 distance from Earth [AU]: 2.60050 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#74 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", 0.002", 72.837° remarks: * orbital elements for (335)Roberta : Mean anomaly = 53.3068523428 deg Arg. of pericenter = 139.7777920804 deg Long. of node = 148.4151185249 deg Inclination = 5.1025346059 deg Eccentricity = 0.1718728585 Semimajor axis = 2.4752789306 AU Perihelion dist = 2.0498456652 AU Mag: H = 9.09, G = 0.15 Epoch of elements : MJD 60672.73128954 TDT (2024 Dec 28.7313) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#742023Apr24,2.73,2024,12,28,17.550951,0.221483,-0.587255,18.525596,6.971462,0.004673,0.001765,-0.000001,0.000000 -20.8520,-10.8668,-82.79,-23.23,False TYC 5815-00428-1,22.65085249,-10.9953303,10.13,9.89,9.76,0.0,0,,22.67265905,-10.8667617,4.15,3.83,0,0,0 335,Roberta,14.01,95.691,2.6005,0,0,4.253,23.58,,4.8,0 0,53.1218,2024,12,28,139.7778,148.4151,5.1025,0.17187,2.47528,2.04985,9.09,5.0,0.15 1.043,0.0130,0.0020,73,0.0022,Known errors,1.21,0,-1,-1 20241228_0428-1,60140.76 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 18:13 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org