IOTA/IOTA-ES occultation update for (1646) Rosseland / UCAC4 373-186855 event on 2024 Dec 27, 12:24 UT Visible from Summary ------- On 2024 Dec 27 UT, the 13.0105317049562 km diameter asteroid (1646) Rosseland will occult a 10.8 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 6.03 mag to 16.79 mag (the magnitude of the asteroid) for at most 0.380 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: 97 * date and approx. time of event: 2024 Dec 27, 12:21 - 2024 Dec 27, 12:27 * geocentric midpoint of event [JD]: 2460672.01723409 * magnitude of target star: 10.76 * magnitude drop [mag]: 6.03 * estimated maximum duration [s]: 0.380 * Moon: 12 % sunlit, 99° distance * Sun: 59° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 13 * 1 sigma uncertainty interval [path widths]: +/- 0.39 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.002", 76°) * approx speed of asteroid's shadow [km/s]: 34.5855 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 373-186855 by 1646 Rosseland on 2024 Dec 27 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 - 35 0 0 - 9 58 14 12 21 48.9 1 106 58 -10 2 1 - 9 54 26 -10 5 1 - 9 51 27 .... - 34 0 0 -10 14 25 12 21 49.0 2 105 59 -10 18 12 -10 10 38 -10 21 11 -10 7 39 -0.09 - 33 0 0 -10 30 9 12 21 49.1 3 105 60 -10 33 56 -10 26 22 -10 36 54 -10 23 23 -0.14 - 32 0 0 -10 45 25 12 21 49.3 4 105 61 -10 49 12 -10 41 39 -10 52 10 -10 38 41 -0.16 - 31 0 0 -11 0 15 12 21 49.5 5 105 62 -11 4 1 -10 56 29 -11 6 59 -10 53 30 -0.17 - 30 0 0 -11 14 36 12 21 49.8 6 105 63 -11 18 22 -11 10 51 -11 21 20 -11 7 53 -0.18 - 29 0 0 -11 28 30 12 21 50.2 7 104 64 -11 32 16 -11 24 45 -11 35 13 -11 21 48 -0.19 - 28 0 0 -11 41 57 12 21 50.6 8 104 65 -11 45 42 -11 38 12 -11 48 39 -11 35 15 -0.19 - 27 0 0 -11 54 55 12 21 51.1 9 104 66 -11 58 40 -11 51 11 -12 1 37 -11 48 14 -0.19 - 26 0 0 -12 7 26 12 21 51.6 10 104 67 -12 11 10 -12 3 42 -12 14 6 -12 0 45 -0.20 - 25 0 0 -12 19 28 12 21 52.2 11 104 68 -12 23 12 -12 15 44 -12 26 8 -12 12 48 -0.20 - 24 0 0 -12 31 3 12 21 52.8 12 103 69 -12 34 46 -12 27 19 -12 37 42 -12 24 23 -0.20 - 23 0 0 -12 42 9 12 21 53.5 13 103 70 -12 45 52 -12 38 26 -12 48 48 -12 35 30 -0.20 - 22 0 0 -12 52 47 12 21 54.3 14 103 71 -12 56 30 -12 49 5 -12 59 26 -12 46 9 -0.20 - 21 0 0 -13 2 57 12 21 55.1 15 103 72 -13 6 40 -12 59 15 -13 9 35 -12 56 19 -0.20 - 20 0 0 -13 12 39 12 21 55.9 16 103 73 -13 16 21 -13 8 57 -13 19 17 -13 6 2 -0.21 - 19 0 0 -13 21 53 12 21 56.9 17 102 73 -13 25 35 -13 18 11 -13 28 29 -13 15 15 -0.21 - 18 0 0 -13 30 38 12 21 57.8 18 102 74 -13 34 19 -13 26 56 -13 37 14 -13 24 1 -0.21 - 17 0 0 -13 38 54 12 21 58.8 19 102 75 -13 42 36 -13 35 13 -13 45 30 -13 32 18 -0.21 - 16 0 0 -13 46 42 12 21 59.9 20 102 76 -13 50 24 -13 43 1 -13 53 18 -13 40 7 -0.21 - 15 0 0 -13 54 2 12 22 1.0 21 102 77 -13 57 43 -13 50 21 -14 0 37 -13 47 27 -0.21 - 14 0 0 -14 0 53 12 22 2.2 22 101 77 -14 4 34 -13 57 12 -14 7 28 -13 54 18 -0.21 - 13 0 0 -14 7 16 12 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0 6 15 16 12 26 6.4 62 219 6 6 11 10 6 19 23 6 7 56 6 22 37 -0.21 75 0 0 6 45 52 12 26 9.6 61 220 5 6 41 45 6 49 59 6 38 31 6 53 13 -0.21 76 0 0 7 16 35 12 26 12.9 60 221 4 7 12 28 7 20 42 7 9 14 7 23 57 -0.21 77 0 0 7 47 26 12 26 16.1 59 222 3 7 43 19 7 51 33 7 40 4 7 54 48 -0.21 78 0 0 8 18 22 12 26 19.2 58 223 2 8 14 15 8 22 30 8 11 0 8 25 45 -0.21 79 0 0 8 49 24 12 26 22.3 57 223 1 8 45 17 8 53 32 8 42 1 8 56 47 -0.21 80 0 0 9 20 30 12 26 25.4 56 224 0 9 16 22 9 24 38 9 13 7 9 27 53 -0.21 81 0 0 9 51 40 12 26 28.4 55 225 -1 9 47 32 9 55 48 9 44 16 9 59 3 -0.21 82 0 0 10 22 52 12 26 31.4 54 225 -3 10 18 44 10 27 0 10 15 28 10 30 15 -0.21 83 0 0 10 54 5 12 26 34.4 52 226 -4 10 49 57 10 58 13 10 46 41 11 1 29 -0.21 84 0 0 11 25 19 12 26 37.3 51 227 -5 11 21 11 11 29 27 11 17 55 11 32 43 -0.21 85 0 0 11 56 33 12 26 40.1 50 227 -6 11 52 24 12 0 41 11 49 9 12 3 57 -0.21 86 0 0 12 27 45 12 26 42.9 49 228 -7 12 23 37 12 31 54 12 20 21 12 35 9 -0.21 87 0 0 12 58 56 12 26 45.7 48 228 -8 12 54 47 13 3 4 12 51 32 13 6 20 -0.21 88 0 0 13 30 3 12 26 48.4 47 229 -9 13 25 55 13 34 11 13 22 39 13 37 27 -0.21 89 0 0 14 1 6 12 26 51.1 46 229 -10 13 56 58 14 5 15 13 53 42 14 8 31 -0.21 90 0 0 14 32 5 12 26 53.6 45 230 -11 14 27 57 14 36 13 14 24 41 14 39 29 -0.21 91 0 0 15 2 58 12 26 56.2 44 230 -13 14 58 50 15 7 6 14 55 34 15 10 22 -0.21 92 0 0 15 33 44 12 26 58.7 43 231 -14 15 29 36 15 37 52 15 26 20 15 41 8 -0.21 93 0 0 16 4 23 12 27 1.1 42 231 -15 16 0 15 16 8 31 15 57 0 16 11 47 -0.21 94 0 0 16 34 54 12 27 3.5 41 232 -16 16 30 46 16 39 1 16 27 30 16 42 17 -0.21 95 0 0 17 5 15 12 27 5.8 40 232 -17 17 1 7 17 9 23 16 57 52 17 12 38 -0.21 96 0 0 17 35 26 12 27 8.0 38 233 -18 17 31 19 17 39 34 17 28 4 17 42 49 -0.21 97 0 0 18 5 27 12 27 10.2 37 233 -19 18 1 20 18 9 35 17 58 5 18 12 50 -0.21 98 0 0 18 35 17 12 27 12.3 36 234 -20 18 31 9 18 39 24 18 27 55 18 42 39 -0.21 99 0 0 19 4 54 12 27 14.4 35 234 -21 19 0 47 19 9 1 18 57 32 19 12 16 -0.21 100 0 0 19 34 18 12 27 16.4 34 234 -22 19 30 11 19 38 25 19 26 57 19 41 39 -0.21 101 0 0 20 3 29 12 27 18.3 33 235 -23 19 59 22 20 7 35 19 56 8 20 10 49 -0.21 102 0 0 20 32 25 12 27 20.2 32 235 -24 20 28 19 20 36 31 20 25 5 20 39 45 -0.21 103 0 0 21 1 6 12 27 22.0 31 236 -25 20 57 0 21 5 12 20 53 46 21 8 26 -0.21 104 0 0 21 29 31 12 27 23.8 30 236 -26 21 25 26 21 33 37 21 22 12 21 36 51 -0.21 105 0 0 21 57 41 12 27 25.5 29 237 -27 21 53 35 22 1 46 21 50 22 22 4 59 -0.21 106 0 0 22 25 33 12 27 27.1 28 237 -28 22 21 28 22 29 38 22 18 15 22 32 51 -0.21 107 0 0 22 53 8 12 27 28.7 27 238 -29 22 49 4 22 57 13 22 45 51 23 0 25 -0.21 108 0 0 23 20 25 12 27 30.2 26 238 -30 23 16 21 23 24 29 23 13 9 23 27 42 -0.21 109 0 0 23 47 24 12 27 31.6 25 238 -31 23 43 20 23 51 27 23 40 8 23 54 40 -0.21 110 0 0 24 14 3 12 27 33.0 24 239 -32 24 10 0 24 18 7 24 6 48 24 21 18 -0.21 111 0 0 24 40 23 12 27 34.4 23 239 -33 24 36 20 24 44 26 24 33 9 24 47 38 -0.21 112 0 0 25 6 24 12 27 35.6 22 240 -34 25 2 21 25 10 26 24 59 10 25 13 37 -0.21 113 0 0 25 32 3 12 27 36.8 21 240 -35 25 28 1 25 36 6 25 24 51 25 39 16 -0.21 114 0 0 25 57 23 12 27 38.0 20 241 -36 25 53 21 26 1 24 25 50 11 26 4 35 -0.21 115 0 0 26 22 21 12 27 39.0 19 241 -37 26 18 20 26 26 22 26 15 10 26 29 32 -0.21 116 0 0 26 46 58 12 27 40.1 18 242 -38 26 42 57 26 50 58 26 39 47 26 54 8 -0.21 117 0 0 27 11 13 12 27 41.0 17 242 -39 27 7 12 27 15 13 27 4 3 27 18 22 -0.21 118 0 0 27 35 5 12 27 41.9 16 243 -40 27 31 6 27 39 5 27 27 57 27 42 14 -0.21 119 0 0 27 58 36 12 27 42.8 15 243 -41 27 54 37 28 2 35 27 51 28 28 5 44 -0.21 120 0 0 28 21 44 12 27 43.6 14 244 -42 28 17 45 28 25 43 28 14 37 28 28 51 -0.21 121 0 0 28 44 29 12 27 44.3 13 244 -43 28 40 31 28 48 28 28 37 23 28 51 35 -0.21 122 0 0 29 6 51 12 27 45.0 12 245 -44 29 2 54 29 10 49 28 59 46 29 13 57 -0.21 123 0 0 29 28 50 12 27 45.6 11 245 -45 29 24 53 29 32 48 29 21 46 29 35 55 -0.21 124 0 0 29 50 26 12 27 46.2 10 246 -46 29 46 29 29 54 23 29 43 23 29 57 29 -0.21 125 0 0 30 11 38 12 27 46.7 9 246 -47 30 7 41 30 15 34 30 4 35 30 18 40 -0.21 126 0 0 30 32 26 12 27 47.2 8 247 -47 30 28 30 30 36 22 30 25 24 30 39 27 -0.21 127 0 0 30 52 50 12 27 47.6 7 247 -48 30 48 55 30 56 45 30 45 50 30 59 51 -0.21 128 0 0 31 12 50 12 27 47.9 6 248 -49 31 8 56 31 16 45 31 5 51 31 19 50 -0.21 129 0 0 31 32 27 12 27 48.2 6 248 -50 31 28 33 31 36 21 31 25 28 31 39 26 -0.21 130 0 0 31 51 39 12 27 48.5 5 249 -51 31 47 45 31 55 32 31 44 41 31 58 37 -0.21 131 0 0 32 10 27 12 27 48.7 4 249 -52 32 6 33 32 14 20 32 3 30 32 17 24 -0.21 132 0 0 32 28 50 12 27 48.9 3 250 -52 32 24 58 32 32 43 32 21 54 32 35 46 -0.21 133 0 0 32 46 49 12 27 49.0 2 250 -53 32 42 57 32 50 42 32 39 54 32 53 45 -0.20 134 0 0 33 4 24 12 27 49.1 1 251 -54 33 0 33 33 8 16 32 57 30 33 11 19 -0.20 135 0 0 33 21 35 12 27 49.1 0 251 -55 33 17 44 33 25 26 33 14 42 33 28 28 -0.11 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.8 Data for the target star ------------------------ * name: UCAC4 373-186855 * constellation : Aquarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 22 34 50.2043 DE: -15 33 35.955 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 22 34 50.2042 DE: -15 33 35.955 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 10.8 * B mag [mag]: 11.3 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1646) Rosseland asteroid class: approx. diameter [km]: 13 approx. diameter ["]: 0.007 distance from Earth [AU]: 2.47450 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#51 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", 0.002", 75.962° remarks: * orbital elements for (1646)Rosseland : Mean anomaly = 326.6091348610 deg Arg. of pericenter = 280.0698089422 deg Long. of node = 119.9481669179 deg Inclination = 8.3806590787 deg Eccentricity = 0.1187006946 Semimajor axis = 2.3601240944 AU Perihelion dist = 2.0799757251 AU Mag: H = 12.07, G = 0.15 Epoch of elements : MJD 60671.51723401 TDT (2024 Dec 27.5172) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#512023Apr24,0.38,2024,12,27,12.413618,-0.081189,0.196307,18.051599,7.430320,0.004598,0.001517,-0.000001,0.000000 56.3557,-15.4327,-5.88,-23.29,False UCAC4 373-186855,22.58061236,-15.5599872,11.26,10.76,10.49,0.1,0,,22.60273467,-15.4327414,6.03,5.85,0,0,0 1646,Rosseland,16.79,13.190,2.4745,0,0,4.437,26.41,,0.8,0 0,326.4685,2024,12,27,280.0698,119.9482,8.3807,0.11870,2.36012,2.07998,12.07,5.0,0.15 1.394,0.0137,0.0021,76,0.0029,Known errors,1.01,0,-1,-1 20241227_186855,60140.76 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 18:10 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org