IOTA/IOTA-ES occultation update for (877) Walkure / UCAC4 364-072828 event on 2024 Jan 27, 18:08 UT Visible from Summary ------- On 2024 Jan 27 UT, the 40.2667844970183 km diameter asteroid (877) Walkure will occult a 10.2 mag star in the constellation Scorpius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.38 mag to 16.60 mag (the magnitude of the asteroid) for at most 1.370 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 Jan 27, 18:04 - 2024 Jan 27, 18:12 * geocentric midpoint of event [JD]: 2460337.25593100 * magnitude of target star: 10.22 * magnitude drop [mag]: 6.38 * estimated maximum duration [s]: 1.370 * Moon: 96 % sunlit, 94° distance * Sun: 63° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 41 * 1 sigma uncertainty interval [path widths]: +/- 0.17 * 1 sigma uncertainty interval [seconds]: +/- 0.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.006, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.006", 0.003", 109°) * approx speed of asteroid's shadow [km/s]: 29.4549 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 364-072828 by 877 Walkure on 2024 Jan 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 117 0 0 3 29 22 18 4 56.6 1 107 -61 3 17 48 3 40 56 3 13 53 3 44 50 .... 118 0 0 3 10 11 18 4 56.7 2 108 -60 2 58 37 3 21 46 2 54 42 3 25 41 0.12 119 0 0 2 50 50 18 4 56.8 3 108 -59 2 39 15 3 2 25 2 35 20 3 6 20 0.11 120 0 0 2 31 19 18 4 57.1 4 108 -58 2 19 43 2 42 55 2 15 48 2 46 50 0.10 121 0 0 2 11 38 18 4 57.4 5 108 -57 2 0 2 2 23 14 1 56 6 2 27 9 0.10 122 0 0 1 51 48 18 4 57.8 6 108 -56 1 40 11 2 3 24 1 36 15 2 7 20 0.10 123 0 0 1 31 48 18 4 58.2 7 108 -55 1 20 11 1 43 25 1 16 15 1 47 21 0.10 124 0 0 1 11 40 18 4 58.8 8 108 -54 1 0 2 1 23 18 0 56 6 1 27 14 0.10 125 0 0 0 51 24 18 4 59.4 9 108 -53 0 39 46 1 3 2 0 35 50 1 6 58 0.09 126 0 0 0 31 0 18 5 0.0 10 108 -52 0 19 22 0 42 39 0 15 25 0 46 35 0.09 127 0 0 0 10 29 18 5 0.8 11 108 -51 - 0 1 10 0 22 8 - 0 5 6 0 26 5 0.09 128 0 0 - 0 10 8 18 5 1.6 12 108 -50 - 0 21 48 0 1 31 - 0 25 44 0 5 28 0.09 129 0 0 - 0 30 52 18 5 2.5 13 108 -49 - 0 42 32 - 0 19 13 - 0 46 29 - 0 15 16 0.09 130 0 0 - 0 51 42 18 5 3.5 14 108 -48 - 1 3 23 - 0 40 2 - 1 7 19 - 0 36 6 0.09 131 0 0 - 1 12 38 18 5 4.5 16 108 -47 - 1 24 18 - 1 0 57 - 1 28 15 - 0 57 1 0.09 132 0 0 - 1 33 38 18 5 5.6 17 108 -46 - 1 45 19 - 1 21 57 - 1 49 16 - 1 18 0 0.09 133 0 0 - 1 54 43 18 5 6.8 18 108 -45 - 2 6 24 - 1 43 2 - 2 10 21 - 1 39 5 0.09 134 0 0 - 2 15 52 18 5 8.1 19 108 -44 - 2 27 33 - 2 4 10 - 2 31 30 - 2 0 13 0.09 135 0 0 - 2 37 4 18 5 9.4 20 108 -43 - 2 48 45 - 2 25 22 - 2 52 43 - 2 21 25 0.09 136 0 0 - 2 58 19 18 5 10.8 21 108 -42 - 3 10 1 - 2 46 38 - 3 13 58 - 2 42 40 0.09 137 0 0 - 3 19 37 18 5 12.3 22 107 -41 - 3 31 19 - 3 7 55 - 3 35 16 - 3 3 58 0.09 138 0 0 - 3 40 57 18 5 13.8 23 107 -39 - 3 52 39 - 3 29 15 - 3 56 36 - 3 25 18 0.09 139 0 0 - 4 2 18 18 5 15.4 24 107 -38 - 4 14 0 - 3 50 36 - 4 17 58 - 3 46 39 0.09 140 0 0 - 4 23 40 18 5 17.1 25 107 -37 - 4 35 23 - 4 11 58 - 4 39 20 - 4 8 1 0.09 141 0 0 - 4 45 3 18 5 18.9 26 107 -36 - 4 56 46 - 4 33 21 - 5 0 43 - 4 29 24 0.09 142 0 0 - 5 6 26 18 5 20.7 27 107 -35 - 5 18 9 - 4 54 44 - 5 22 6 - 4 50 47 0.09 143 0 0 - 5 27 49 18 5 22.6 28 107 -34 - 5 39 31 - 5 16 7 - 5 43 29 - 5 12 9 0.09 144 0 0 - 5 49 10 18 5 24.5 29 107 -33 - 6 0 53 - 5 37 28 - 6 4 50 - 5 33 31 0.09 145 0 0 - 6 10 30 18 5 26.5 30 107 -32 - 6 22 13 - 5 58 48 - 6 26 10 - 5 54 51 0.09 146 0 0 - 6 31 48 18 5 28.6 31 106 -31 - 6 43 30 - 6 20 6 - 6 47 28 - 6 16 9 0.09 147 0 0 - 6 53 4 18 5 30.7 33 106 -30 - 7 4 46 - 6 41 22 - 7 8 43 - 6 37 25 0.09 148 0 0 - 7 14 17 18 5 32.9 34 106 -29 - 7 25 58 - 7 2 35 - 7 29 56 - 6 58 38 0.09 149 0 0 - 7 35 26 18 5 35.2 35 106 -28 - 7 47 7 - 7 23 44 - 7 51 5 - 7 19 47 0.09 150 0 0 - 7 56 31 18 5 37.5 36 106 -27 - 8 8 12 - 7 44 50 - 8 12 10 - 7 40 53 0.09 151 0 0 - 8 17 32 18 5 39.9 37 106 -26 - 8 29 13 - 8 5 51 - 8 33 10 - 8 1 54 0.09 152 0 0 - 8 38 27 18 5 42.3 38 105 -25 - 8 50 8 - 8 26 47 - 8 54 6 - 8 22 50 0.09 153 0 0 - 8 59 18 18 5 44.8 39 105 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255 74 -16 2 36 -15 39 38 -16 6 29 -15 35 45 0.10 - 72 0 0 -15 34 6 18 12 5.2 9 254 73 -15 45 35 -15 22 36 -15 49 28 -15 18 43 0.10 - 71 0 0 -15 16 51 18 12 5.8 8 254 72 -15 28 21 -15 5 21 -15 32 15 -15 1 28 0.10 - 70 0 0 -14 59 24 18 12 6.3 7 254 71 -15 10 54 -14 47 53 -15 14 48 -14 44 0 0.11 - 69 0 0 -14 41 43 18 12 6.8 6 254 70 -14 53 15 -14 30 12 -14 57 8 -14 26 18 0.11 - 68 0 0 -14 23 50 18 12 7.2 5 253 69 -14 35 22 -14 12 18 -14 39 16 -14 8 25 0.11 - 67 0 0 -14 5 45 18 12 7.5 4 253 68 -14 17 18 -13 54 13 -14 21 12 -13 50 19 0.12 - 66 0 0 -13 47 28 18 12 7.8 3 253 67 -13 59 2 -13 35 55 -14 2 56 -13 32 1 0.13 - 65 0 0 -13 29 0 18 12 8.0 2 253 66 -13 40 34 -13 17 26 -13 44 28 -13 13 32 0.15 - 64 0 0 -13 10 20 18 12 8.1 1 252 65 -13 21 55 -12 58 46 -13 25 50 -12 54 52 0.20 - 63 0 0 -12 51 30 18 12 8.1 0 252 64 -13 3 5 -12 39 55 -13 7 0 -12 36 1 0.52 Uncertainty in time = +/- 0 secs Prediction of 2023 Jul 12.0 Data for the target star ------------------------ * name: UCAC4 364-072828 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 10 06.0417 DE: -17 21 13.688 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 10 06.0417 DE: -17 21 13.688 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.2 * B mag [mag]: 10.9 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (877) Walkure asteroid class: approx. diameter [km]: 40 approx. diameter ["]: 0.017 distance from Earth [AU]: 3.17420 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#96 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): 0.006", 0.003", 108.693° remarks: * orbital elements for (877)Walkure : Mean anomaly = 198.5232121321 deg Arg. of pericenter = 275.8776318056 deg Long. of node = 116.3530870651 deg Inclination = 4.2544495681 deg Eccentricity = 0.1591091187 Semimajor axis = 2.4877631101 AU Perihelion dist = 2.0919373140 AU Mag: H = 10.87, G = 0.15 Epoch of elements : MJD 60336.75593104 TDT (2024 Jan 27.7559) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#962023Apr24,1.37,2024,1,27,18.142344,-0.011948,-0.081158,16.439178,-2.480013,-0.005170,0.001127,-0.000001,0.000000 -155.7921,-17.4170,-88.96,-18.45,False UCAC4 364-072828,16.16834487,-17.3538021,10.89,10.22,9.86,0.1,0,,16.19110663,-17.4170043,6.38,6.29,0,0,0 877,Walkure,16.60,40.497,3.1742,0,0,3.183,-6.87,,2.2,0 0,198.3333,2024,1,27,275.8776,116.3531,4.2544,0.15911,2.48776,2.09194,10.87,5.0,0.15 1.169,0.0063,0.0028,109,0.0030,Known errors,1.09,0,-1,-1 20240127_072828,60137.03 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 12, 00:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org