IOTA/IOTA-ES occultation update for (465) Alekto / UCAC4-328-171063 event on 2022 Jul 29, 06:57 UT Visible from New Zealand Summary ------- On 2022 Jul 29 UT, the 74.5 km diameter asteroid (465) Alekto will occult a 12.5 mag star in the constellation Sagittarius for observers along a path across New Zealand. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.65 mag to 13.88 mag (the magnitude of the asteroid) for at most 10.240 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: 2022 Jul 29, 06:44 - 2022 Jul 29, 07:10 * geocentric midpoint of event [JD]: 2459789.78987196 * magnitude of target star: 12.50 * magnitude drop [mag]: 1.65 * estimated maximum duration [s]: 10.240 * Moon: 1 % sunlit, 146° distance * Sun: 153° distance * rough path description: New Zealand The occultation path -------------------- * approximate projected width [km]: 87 * 1 sigma uncertainty interval [path widths]: +/- 0.17 * 1 sigma uncertainty interval [seconds]: +/- 4.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.028, +/- 0.007) * 1 sigma uncertainty ellipse (major, minor, PA): (0.028", 0.006", 84°) * approx speed of asteroid's shadow [km/s]: 7.2734 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-328-171063 by 465 Alekto on 2022 Jul 29 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 127 0 0 -19 39 30 7 9 54.5 0 116 26 -19 13 30 -20 5 38 -19 4 49 -20 14 25 .... 128 0 0 -20 7 40 7 9 54.2 1 116 25 -19 41 35 -20 33 51 -19 32 54 -20 42 39 0.48 129 0 0 -20 36 4 7 9 53.5 2 115 23 -20 9 56 -21 2 19 -20 1 13 -21 11 8 0.53 130 0 0 -21 4 42 7 9 52.6 3 115 22 -20 38 31 -21 31 1 -20 29 47 -21 39 51 0.54 131 0 0 -21 33 33 7 9 51.3 4 115 21 -21 7 19 -21 59 55 -20 58 34 -22 8 46 0.55 132 0 0 -22 2 37 7 9 49.6 5 114 20 -21 36 19 -22 29 2 -21 27 33 -22 37 54 0.56 133 0 0 -22 31 51 7 9 47.7 7 114 19 -22 5 31 -22 58 20 -21 56 44 -23 7 14 0.56 134 0 0 -23 1 17 7 9 45.4 8 114 18 -22 34 53 -23 27 49 -22 26 5 -23 36 43 0.57 135 0 0 -23 30 52 7 9 42.7 9 113 17 -23 4 25 -23 57 27 -22 55 36 -24 6 22 0.57 136 0 0 -24 0 35 7 9 39.8 10 113 16 -23 34 5 -24 27 14 -23 25 15 -24 36 10 0.57 137 0 0 -24 30 27 7 9 36.5 11 112 15 -24 3 54 -24 57 8 -23 55 3 -25 6 6 0.57 138 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53.1 27 263 -40 -50 9 10 -51 0 44 -50 0 36 -51 9 25 0.61 - 50 0 0 -50 17 14 6 46 47.6 26 262 -39 -49 51 28 -50 43 9 -49 42 52 -50 51 51 0.61 - 49 0 0 -49 59 13 6 46 42.1 25 261 -39 -49 33 22 -50 25 11 -49 24 45 -50 33 55 0.61 - 48 0 0 -49 40 48 6 46 36.8 25 260 -38 -49 14 54 -50 6 51 -49 6 16 -50 15 35 0.61 - 47 0 0 -49 22 1 6 46 31.5 24 260 -38 -48 56 3 -49 48 8 -48 47 24 -49 56 53 0.61 - 46 0 0 -49 2 51 6 46 26.4 23 259 -37 -48 36 49 -49 29 1 -48 28 8 -49 37 48 0.61 - 45 0 0 -48 43 18 6 46 21.3 23 258 -37 -48 17 12 -49 9 32 -48 8 30 -49 18 20 0.61 - 44 0 0 -48 23 22 6 46 16.3 22 257 -36 -47 57 13 -48 49 40 -47 48 29 -48 58 29 0.61 - 43 0 0 -48 3 3 6 46 11.5 21 256 -36 -47 36 50 -48 29 24 -47 28 5 -48 38 15 0.61 - 42 0 0 -47 42 21 6 46 6.7 20 256 -35 -47 16 4 -48 8 46 -47 7 18 -48 17 38 0.61 - 41 0 0 -47 21 15 6 46 2.1 20 255 -35 -46 54 55 -47 47 44 -46 46 8 -47 56 38 0.61 - 40 0 0 -46 59 47 6 45 57.5 19 254 -34 -46 33 23 -47 26 19 -46 24 36 -47 35 14 0.61 - 39 0 0 -46 37 56 6 45 53.2 18 253 -33 -46 11 29 -47 4 32 -46 2 40 -47 13 27 0.61 - 38 0 0 -46 15 42 6 45 48.9 17 252 -33 -45 49 11 -46 42 21 -45 40 21 -46 51 18 0.61 - 37 0 0 -45 53 5 6 45 44.8 17 252 -32 -45 26 31 -46 19 47 -45 17 40 -46 28 45 0.61 - 36 0 0 -45 30 5 6 45 40.8 16 251 -31 -45 3 28 -45 56 51 -44 54 35 -46 5 50 0.62 - 35 0 0 -45 6 43 6 45 36.9 15 250 -31 -44 40 2 -45 33 32 -44 31 9 -45 42 32 0.62 - 34 0 0 -44 42 58 6 45 33.2 14 250 -30 -44 16 14 -45 9 50 -44 7 20 -45 18 51 0.62 - 33 0 0 -44 18 51 6 45 29.7 14 249 -29 -43 52 4 -44 45 46 -43 43 9 -44 54 48 0.62 - 32 0 0 -43 54 21 6 45 26.4 13 248 -29 -43 27 32 -44 21 19 -43 18 36 -44 30 23 0.62 - 31 0 0 -43 29 30 6 45 23.2 12 247 -28 -43 2 38 -43 56 31 -42 53 41 -44 5 35 0.62 - 30 0 0 -43 4 17 6 45 20.2 11 247 -27 -42 37 22 -43 31 21 -42 28 24 -43 40 26 0.63 - 29 0 0 -42 38 43 6 45 17.4 10 246 -27 -42 11 45 -43 5 49 -42 2 46 -43 14 55 0.63 - 28 0 0 -42 12 47 6 45 14.7 9 245 -26 -41 45 47 -42 39 56 -41 36 47 -42 49 3 0.63 - 27 0 0 -41 46 31 6 45 12.3 9 245 -25 -41 19 29 -42 13 42 -41 10 28 -42 22 50 0.64 - 26 0 0 -41 19 54 6 45 10.1 8 244 -24 -40 52 50 -41 47 8 -40 43 48 -41 56 16 0.64 - 25 0 0 -40 52 58 6 45 8.1 7 243 -24 -40 25 51 -41 20 13 -40 16 49 -41 29 23 0.65 - 24 0 0 -40 25 41 6 45 6.3 6 243 -23 -39 58 33 -40 52 59 -39 49 30 -41 2 9 0.66 - 23 0 0 -39 58 5 6 45 4.8 5 242 -22 -39 30 55 -40 25 25 -39 21 51 -40 34 36 0.68 - 22 0 0 -39 30 11 6 45 3.5 4 241 -21 -39 2 59 -39 57 32 -38 53 55 -40 6 43 0.70 - 21 0 0 -39 1 58 6 45 2.4 3 241 -20 -38 34 44 -39 29 21 -38 25 40 -39 38 33 0.73 - 20 0 0 -38 33 28 6 45 1.6 2 240 -19 -38 6 13 -39 0 52 -37 57 8 -39 10 4 0.78 - 19 0 0 -38 4 40 6 45 1.0 1 240 -19 -37 37 24 -38 32 6 -37 28 18 -38 41 18 0.92 - 18 0 0 -37 35 36 6 45 0.7 0 239 -18 -37 8 18 -38 3 3 -36 59 12 -38 12 15 1.57 Uncertainty in time = +/- 5 secs Prediction of 2022 Jun 13.9 Data for the target star ------------------------ * name: UCAC4-328-171063 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 40 13.5371 DE: -24 34 35.523 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 40 13.5371 DE: -24 34 35.523 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (465) Alekto asteroid class: approx. diameter [km]: 75 approx. diameter ["]: 0.058 distance from Earth [AU]: 1.77320 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#63 date of fit: 2022 Jun 06 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): 0.028", 0.006", 84.281° remarks: * orbital elements for (465)Alekto : Mean anomaly = 44.3802498649 deg Arg. of pericenter = 284.1276316782 deg Long. of node = 300.5653036332 deg Inclination = 4.6485802944 deg Eccentricity = 0.2052517409 Semimajor axis = 3.0928965131 AU Perihelion dist = 2.4580741195 AU Mag: H = 9.95, G = 0.15 Epoch of elements : MJD 59789.28958333 TDT (2022 Jul 29.2896) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#632022Jun06,10.24,2022,7,29,6.956927,-0.089027,-0.514849,-4.042001,0.718069,0.002491,0.000304,0.000001,0.000000 -130.8628,-24.5558,77.28,18.73,False UCAC4-328-171063,18.67042698,-24.5765341,0.00,12.50,0.00,0.0,0,,18.69362159,-24.5557668,1.65,0.00,0,0,0 465,Alekto,13.88,74.5,1.7732,0,0,-1.468,3.56,,4.0 0,44.3278,2022,7,29,284.1276,300.5653,4.6486,0.20525,3.09290,2.45807,9.83,5.0,0.15 1.167,0.0277,0.0063,84,0.0097,Known errors,-1.00,-1,-1,-1 20220729_171063,59743.86 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Jun 13, 20:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org