IOTA/IOTA-ES occultation update for (1447) Utra / UCAC4 318-178356 event on 2024 Mar 25, 19:54 UT Visible from Summary ------- On 2024 Mar 25 UT, the 11.984 km diameter asteroid (1447) Utra will occult a 11.8 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.07 mag to 16.83 mag (the magnitude of the asteroid) for at most 0.710 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: 96 * date and approx. time of event: 2024 Mar 25, 19:48 - 2024 Mar 25, 20:01 * geocentric midpoint of event [JD]: 2460395.32979479 * magnitude of target star: 11.77 * magnitude drop [mag]: 5.07 * estimated maximum duration [s]: 0.710 * Moon: 100 % sunlit, 83° distance * Sun: 91° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 0.41 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.010", 0.003", 95°) * approx speed of asteroid's shadow [km/s]: 16.8713 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 318-178356 by 1447 Utra on 2024 Mar 25 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 63 0 0 - 4 51 15 19 48 43.4 1 117 -87 - 4 54 58 - 4 47 31 - 4 58 1 - 4 44 28 .... 64 0 0 - 5 21 32 19 48 43.6 2 116 -87 - 5 25 16 - 5 17 49 - 5 28 20 - 5 14 46 0.23 65 0 0 - 5 52 0 19 48 43.9 3 116 -86 - 5 55 44 - 5 48 17 - 5 58 48 - 5 45 13 0.22 66 0 0 - 6 22 37 19 48 44.4 4 116 -86 - 6 26 21 - 6 18 53 - 6 29 25 - 6 15 49 0.22 67 0 0 - 6 53 22 19 48 45.0 5 116 -85 - 6 57 6 - 6 49 37 - 7 0 10 - 6 46 33 0.22 68 0 0 - 7 24 14 19 48 45.7 6 116 -84 - 7 27 58 - 7 20 29 - 7 31 2 - 7 17 25 0.22 69 0 0 - 7 55 12 19 48 46.6 7 116 -83 - 7 58 57 - 7 51 27 - 8 2 1 - 7 48 23 0.22 70 0 0 - 8 26 16 19 48 47.7 9 116 -82 - 8 30 1 - 8 22 31 - 8 33 5 - 8 19 26 0.22 71 0 0 - 8 57 24 19 48 48.9 10 116 -81 - 9 1 9 - 8 53 39 - 9 4 14 - 8 50 35 0.22 72 0 0 - 9 28 37 19 48 50.2 11 115 -79 - 9 32 22 - 9 24 52 - 9 35 27 - 9 21 47 0.21 73 0 0 - 9 59 52 19 48 51.7 12 115 -78 -10 3 37 - 9 56 7 -10 6 42 - 9 53 2 0.21 74 0 0 -10 31 9 19 48 53.3 13 115 -77 -10 34 54 -10 27 23 -10 37 59 -10 24 18 0.21 75 0 0 -11 2 27 19 48 55.1 14 115 -76 -11 6 12 -10 58 41 -11 9 18 -10 55 36 0.21 76 0 0 -11 33 45 19 48 57.0 15 115 -75 -11 37 30 -11 29 59 -11 40 36 -11 26 54 0.21 77 0 0 -12 5 2 19 48 59.0 16 114 -74 -12 8 48 -12 1 17 -12 11 53 -11 58 11 0.21 78 0 0 -12 36 18 19 49 1.2 17 114 -73 -12 40 3 -12 32 32 -12 43 9 -12 29 27 0.21 79 0 0 -13 7 31 19 49 3.5 19 114 -72 -13 11 16 -13 3 45 -13 14 22 -13 0 40 0.21 80 0 0 -13 38 40 19 49 5.9 20 114 -71 -13 42 26 -13 34 55 -13 45 31 -13 31 49 0.21 81 0 0 -14 9 45 19 49 8.5 21 113 -70 -14 13 31 -14 6 0 -14 16 36 -14 2 54 0.21 82 0 0 -14 40 45 19 49 11.2 22 113 -68 -14 44 30 -14 36 59 -14 47 36 -14 33 54 0.21 83 0 0 -15 11 38 19 49 14.1 23 113 -67 -15 15 23 -15 7 53 -15 18 29 -15 4 47 0.21 84 0 0 -15 42 24 19 49 17.0 24 112 -66 -15 46 10 -15 38 39 -15 49 15 -15 35 34 0.21 85 0 0 -16 13 2 19 49 20.1 25 112 -65 -16 16 48 -16 9 17 -16 19 53 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-24 26 32 -24 19 12 -24 29 33 -24 16 11 0.22 -128 0 0 -23 56 44 20 0 45.0 18 249 62 -24 0 24 -23 53 3 -24 3 26 -23 50 2 0.22 -127 0 0 -23 30 16 20 0 47.1 17 248 63 -23 33 57 -23 26 35 -23 36 59 -23 23 34 0.22 -126 0 0 -23 3 30 20 0 49.1 16 248 64 -23 7 11 -22 59 48 -23 10 13 -22 56 47 0.22 -125 0 0 -22 36 25 20 0 51.0 15 247 64 -22 40 7 -22 32 43 -22 43 9 -22 29 41 0.23 -124 0 0 -22 9 2 20 0 52.8 14 247 65 -22 12 44 -22 5 20 -22 15 47 -22 2 18 0.23 -123 0 0 -21 41 23 20 0 54.5 13 246 66 -21 45 5 -21 37 41 -21 48 8 -21 34 38 0.23 -122 0 0 -21 13 27 20 0 56.1 12 246 66 -21 17 9 -21 9 44 -21 20 12 -21 6 41 0.23 -121 0 0 -20 45 14 20 0 57.5 11 246 67 -20 48 57 -20 41 31 -20 52 0 -20 38 28 0.23 -120 0 0 -20 16 47 20 0 58.8 10 245 68 -20 20 30 -20 13 4 -20 23 33 -20 10 0 0.24 -119 0 0 -19 48 5 20 1 0.0 9 245 68 -19 51 48 -19 44 21 -19 54 52 -19 41 18 0.24 -118 0 0 -19 19 9 20 1 1.1 8 245 68 -19 22 52 -19 15 25 -19 25 56 -19 12 21 0.24 -117 0 0 -18 49 59 20 1 2.1 7 244 69 -18 53 43 -18 46 15 -18 56 47 -18 43 11 0.25 -116 0 0 -18 20 37 20 1 2.9 6 244 69 -18 24 21 -18 16 53 -18 27 25 -18 13 49 0.26 -115 0 0 -17 51 3 20 1 3.6 5 244 70 -17 54 48 -17 47 19 -17 57 52 -17 44 15 0.27 -114 0 0 -17 21 19 20 1 4.1 4 243 70 -17 25 3 -17 17 34 -17 28 7 -17 14 30 0.28 -113 0 0 -16 51 23 20 1 4.5 3 243 70 -16 55 8 -16 47 39 -16 58 13 -16 44 34 0.31 -112 0 0 -16 21 19 20 1 4.8 2 243 70 -16 25 3 -16 17 34 -16 28 8 -16 14 30 0.38 -111 0 0 -15 51 5 20 1 4.9 1 243 70 -15 54 50 -15 47 21 -15 57 55 -15 44 16 0.74 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 14.3 Data for the target star ------------------------ * name: UCAC4 318-178356 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 20 48.9396 DE: -26 28 51.190 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 20 48.9397 DE: -26 28 51.190 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.8 * B mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1447) Utra asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.007 distance from Earth [AU]: 2.41530 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#55 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): 0.010", 0.003", 95° remarks: * orbital elements for (1447)Utra : Mean anomaly = 147.1993652197 deg Arg. of pericenter = 67.3644999784 deg Long. of node = 35.3877054700 deg Inclination = 4.7845072842 deg Eccentricity = 0.0409950204 Semimajor axis = 2.5351816676 AU Perihelion dist = 2.4312518434 AU Mag: H = 11.75, G = 0.15 Epoch of elements : MJD 60394.82979463 TDT (2024 Mar 25.8298) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr24,0.71,2024,3,25,19.915075,-0.020699,-0.193299,9.467538,-1.022757,-0.005688,-0.000217,0.000000,0.000000 153.0900,-26.4706,-117.30,2.25,False UCAC4 318-178356,18.34692764,-26.4808861,12.52,11.77,11.37,0.0,0,,18.37198673,-26.4705531,5.07,5.03,0,0,0 1447,Utra,16.83,11.984,2.4153,0,0,2.567,-3.72,,1.0,0 0,146.9968,2024,3,25,67.3645,35.3877,4.7845,0.04100,2.53518,2.43125,11.75,5.0,0.15 1.411,0.0100,0.0028,95,0.0028,Known errors,0.77,0,-1,-1 20240325_178356,60139.26 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 06:08 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org