IOTA/IOTA-ES occultation update for (1404) Ajax / UCAC4-666-023171 event on 2022 Oct 22, 10:28 UT Visible from NE USA, Canada Summary ------- On 2022 Oct 22 UT, the 85 km diameter asteroid (1404) Ajax will occult a 12.2 mag star in the constellation Perseus for observers along a path across NE USA, Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.17 mag to 16.34 mag (the magnitude of the asteroid) for at most 7.760 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: 90 * date and approx. time of event: 2022 Oct 22, 10:20 - 2022 Oct 22, 10:38 * geocentric midpoint of event [JD]: 2459874.93713346 * magnitude of target star: 12.19 * magnitude drop [mag]: 4.17 * estimated maximum duration [s]: 7.760 * Moon: 10 % sunlit, 100° distance * Sun: 135° distance * rough path description: NE USA, Canada The occultation path -------------------- * approximate projected width [km]: 95 * 1 sigma uncertainty interval [path widths]: +/- 0.53 * 1 sigma uncertainty interval [seconds]: +/- 6.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.028, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.028", 0.008", 85°) * approx speed of asteroid's shadow [km/s]: 10.9569 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-666-023171 by 1404 Ajax on 2022 Oct 22 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 103 0 0 35 8 6 10 38 8.1 0 34 -3 35 54 17 .. .. .. 36 43 39 .. .. .. .... 104 0 0 36 21 54 10 38 7.7 2 34 -4 37 8 13 35 36 7 37 57 44 34 48 19 -0.40 105 0 0 37 34 48 10 38 6.9 3 35 -5 38 21 13 36 48 54 39 10 52 36 1 0 -0.43 106 0 0 38 46 43 10 38 5.8 5 36 -6 39 33 14 38 0 45 40 22 58 37 12 47 -0.45 107 0 0 39 57 35 10 38 4.2 6 36 -7 40 44 8 39 11 34 41 33 56 38 23 33 -0.45 108 0 0 41 7 18 10 38 2.3 7 37 -8 41 53 53 40 21 16 42 43 42 39 33 13 -0.46 109 0 0 42 15 48 10 38 0.1 9 38 -9 43 2 22 41 29 47 43 52 11 40 41 45 -0.46 110 0 0 43 23 1 10 37 57.5 10 38 -10 44 9 33 42 37 2 44 59 20 41 49 3 -0.46 111 0 0 44 28 54 10 37 54.7 11 39 -11 45 15 22 43 42 59 46 5 5 42 55 4 -0.47 112 0 0 45 33 23 10 37 51.6 13 40 -12 46 19 46 44 47 34 47 9 22 43 59 44 -0.47 113 0 0 46 36 26 10 37 48.3 14 41 -12 47 22 41 45 50 44 48 12 10 45 3 2 -0.47 114 0 0 47 38 0 10 37 44.7 15 41 -13 48 24 6 46 52 27 49 13 25 46 4 54 -0.47 115 0 0 48 38 4 10 37 41.0 16 42 -14 49 23 59 47 52 41 50 13 7 47 5 19 -0.47 116 0 0 49 36 36 10 37 37.0 18 43 -14 50 22 19 48 51 25 51 11 13 48 4 15 -0.47 117 0 0 50 33 35 10 37 33.0 19 44 -15 51 19 4 49 48 37 52 7 44 49 1 41 -0.48 118 0 0 51 29 0 10 37 28.8 20 44 -16 52 14 15 50 44 17 53 2 37 49 57 36 -0.48 119 0 0 52 22 51 10 37 24.5 21 45 -16 53 7 49 51 38 24 53 55 55 50 51 59 -0.48 120 0 0 53 15 8 10 37 20.1 22 46 -17 53 59 49 52 30 58 54 47 35 51 44 51 -0.48 121 0 0 54 5 52 10 37 15.6 23 47 -17 54 50 14 53 22 0 55 37 40 52 36 11 -0.48 122 0 0 54 55 3 10 37 11.1 24 48 -18 55 39 5 54 11 29 56 26 10 53 26 0 -0.48 123 0 0 55 42 41 10 37 6.5 25 49 -18 56 26 23 54 59 28 57 13 5 54 14 19 -0.48 124 0 0 56 28 49 10 37 1.9 26 50 -19 57 12 10 55 45 56 57 58 28 55 1 9 -0.48 125 0 0 57 13 27 10 36 57.3 27 51 -19 57 56 25 56 30 55 58 42 20 55 46 30 -0.48 126 0 0 57 56 36 10 36 52.6 27 52 -19 58 39 12 57 14 27 59 24 42 56 30 25 -0.48 127 0 0 58 38 19 10 36 48.0 28 53 -20 59 20 32 57 56 33 60 5 37 57 12 54 -0.49 128 0 0 59 18 38 10 36 43.4 29 54 -20 60 0 27 58 37 15 60 45 6 57 53 59 -0.49 129 0 0 59 57 34 10 36 38.8 30 55 -21 60 38 59 59 16 34 61 23 11 58 33 42 -0.49 130 0 0 60 35 9 10 36 34.2 31 56 -21 61 16 9 59 54 33 61 59 55 59 12 5 -0.49 131 0 0 61 11 25 10 36 29.7 31 57 -21 61 52 1 60 31 13 62 35 20 59 49 10 -0.49 132 0 0 61 46 25 10 36 25.2 32 58 -21 62 26 36 61 6 37 63 9 28 60 24 59 -0.49 133 0 0 62 20 10 10 36 20.7 33 59 -22 62 59 56 61 40 46 63 42 21 60 59 33 -0.49 134 0 0 62 52 43 10 36 16.3 33 60 -22 63 32 4 62 13 44 64 14 2 61 32 56 -0.49 135 0 0 63 24 6 10 36 11.9 34 61 -22 64 3 2 62 45 31 64 44 33 62 5 8 -0.49 136 0 0 63 54 21 10 36 7.6 35 62 -22 64 32 53 63 16 10 65 13 57 62 36 12 -0.49 137 0 0 64 23 31 10 36 3.4 35 63 -23 65 1 38 63 45 44 65 42 15 63 6 10 -0.49 138 0 0 64 51 37 10 35 59.2 36 64 -23 65 29 19 64 14 13 66 9 30 63 35 4 -0.49 139 0 0 65 18 41 10 35 55.0 36 65 -23 65 56 0 64 41 42 66 35 44 64 2 57 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-0.50 - 44 0 0 15 5 0 10 21 21.4 18 311 21 15 44 52 14 25 28 16 27 21 13 44 5 -0.50 - 43 0 0 13 55 36 10 21 16.2 17 311 22 14 35 5 13 16 26 15 17 10 12 35 26 -0.50 - 42 0 0 12 46 59 10 21 11.4 16 312 23 13 26 5 12 8 11 14 7 45 11 27 34 -0.50 - 41 0 0 11 39 11 10 21 7.2 14 312 25 12 17 55 11 0 46 12 59 10 10 20 32 -0.51 - 40 0 0 10 32 18 10 21 3.3 13 312 26 11 10 38 9 54 15 11 51 28 9 14 23 -0.51 - 39 0 0 9 26 20 10 20 59.9 11 312 27 10 4 18 8 48 40 10 44 43 8 9 11 -0.52 - 38 0 0 8 21 22 10 20 56.9 10 313 28 8 58 56 7 44 4 9 38 57 7 4 58 -0.52 - 37 0 0 7 17 24 10 20 54.3 8 313 30 7 54 36 6 40 29 8 34 12 6 1 46 -0.53 - 36 0 0 6 14 31 10 20 52.2 7 313 31 6 51 20 5 37 57 7 30 32 4 59 37 -0.55 - 35 0 0 5 12 43 10 20 50.4 5 313 32 5 49 10 4 36 31 6 27 57 3 58 34 -0.57 - 34 0 0 4 12 2 10 20 49.1 4 313 33 4 48 7 3 36 12 5 26 30 2 58 37 -0.60 - 33 0 0 3 12 31 10 20 48.2 3 313 34 3 48 14 2 37 2 4 26 13 1 59 49 -0.67 - 32 0 0 2 14 9 10 20 47.7 1 313 36 2 49 31 1 39 2 3 27 7 1 2 11 -0.90 Uncertainty in time = +/- 7 secs Prediction of 2022 Oct 17.0 Data for the target star ------------------------ * name: UCAC4-666-023171 * constellation : Perseus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 04 12 46.9972 DE: +43 07 44.986 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 04 12 46.9973 DE: +43 07 44.986 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1404) Ajax asteroid class: approx. diameter [km]: 85 approx. diameter ["]: 0.029 distance from Earth [AU]: 3.97950 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#51 date of fit: 2022 Sep 21 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", 0.008", 84.891° remarks: * orbital elements for (1404)Ajax : Mean anomaly = 21.1779176793 deg Arg. of pericenter = 61.6171031874 deg Long. of node = 332.8791727399 deg Inclination = 18.0305134482 deg Eccentricity = 0.1138893380 Semimajor axis = 5.2855287619 AU Perihelion dist = 4.6835633901 AU Mag: H = 9.37, G = 0.15 Epoch of elements : MJD 59874.43673611 TDT (2022 Oct 22.4367) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#512022Sep21,7.76,2022,10,22,10.491203,0.186397,0.406627,-5.620558,2.579901,-0.003558,-0.002410,0.000001,0.000000 -124.6106,43.1866,18.76,-11.12,False UCAC4-666-023171,4.21305479,43.1291628,0.00,12.19,0.00,0.0,0,,4.23969446,43.1866462,4.18,0.00,0,0,0 1404,Ajax,16.34,85.0,3.9795,0,0,-1.136,5.70,,5.6,0 0,21.1425,2022,10,22,61.6171,332.8792,18.0305,0.11389,5.28553,4.68356,9.38,5.0,0.15 1.528,0.0283,0.0077,85,0.0155,Known errors,-1.00,-1,-1,-1 20221022_023171,59868.96 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Oct 16, 23:06 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org