IOTA/IOTA-ES occultation update for (546) Herodias / UCAC4-631-041134 event on 2022 Oct 06, 19:04 UT Visible from N Australia Summary ------- On 2022 Oct 06 UT, the 65 km diameter asteroid (546) Herodias will occult a 12.5 mag star in the constellation Auriga for observers along a path across N Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.26 mag to 14.59 mag (the magnitude of the asteroid) for at most 3.030 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 Oct 06, 19:01 - 2022 Oct 06, 19:10 * geocentric midpoint of event [JD]: 2459859.29562800 * magnitude of target star: 12.48 * magnitude drop [mag]: 2.26 * estimated maximum duration [s]: 3.030 * Moon: 89 % sunlit, 133° distance * Sun: 87° distance * rough path description: N Australia The occultation path -------------------- * approximate projected width [km]: 77 * 1 sigma uncertainty interval [path widths]: +/- 0.13 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.003", 94°) * approx speed of asteroid's shadow [km/s]: 21.4448 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-631-041134 by 546 Herodias on 2022 Oct 6 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 111 0 0 -34 34 9 19 1 31.6 1 44 -36 -35 4 6 -34 4 26 -35 12 5 -33 56 36 .... 112 0 0 -33 42 40 19 1 31.8 2 43 -35 -34 12 31 -33 13 3 -34 20 28 -33 5 14 0.33 113 0 0 -32 51 0 19 1 32.1 3 42 -35 -33 20 45 -32 21 29 -33 28 40 -32 13 42 0.43 114 0 0 -31 59 13 19 1 32.6 4 42 -35 -32 28 50 -31 29 48 -32 36 44 -31 22 3 0.48 115 0 0 -31 7 20 19 1 33.2 6 41 -35 -31 36 51 -30 38 3 -31 44 42 -30 30 19 0.51 116 0 0 -30 15 25 19 1 34.0 7 41 -35 -30 44 48 -29 46 15 -30 52 38 -29 38 33 0.53 117 0 0 -29 23 30 19 1 35.0 8 40 -34 -29 52 45 -28 54 28 -30 0 33 -28 46 48 0.55 118 0 0 -28 31 38 19 1 36.2 9 40 -34 -29 0 45 -28 2 45 -29 8 30 -27 55 7 0.56 119 0 0 -27 39 52 19 1 37.5 11 39 -34 -28 8 50 -27 11 7 -28 16 33 -27 3 31 0.56 120 0 0 -26 48 15 19 1 38.9 12 39 -33 -27 17 4 -26 19 38 -27 24 44 -26 12 5 0.57 121 0 0 -25 56 48 19 1 40.6 13 38 -33 -26 25 28 -25 28 21 -26 33 6 -25 20 50 0.57 122 0 0 -25 5 35 19 1 42.4 14 38 -32 -25 34 5 -24 37 17 -25 41 41 -24 29 49 0.58 123 0 0 -24 14 38 19 1 44.3 16 37 -32 -24 42 59 -23 46 29 -24 50 32 -23 39 4 0.58 124 0 0 -23 24 0 19 1 46.4 17 37 -31 -23 52 10 -22 56 1 -23 59 40 -22 48 37 0.59 125 0 0 -22 33 42 19 1 48.7 18 36 -31 -23 1 42 -22 5 53 -23 9 10 -21 58 32 0.59 126 0 0 -21 43 47 19 1 51.2 19 36 -30 -22 11 38 -21 16 9 -22 19 2 -21 8 50 0.59 127 0 0 -20 54 18 19 1 53.7 20 36 -30 -21 21 58 -20 26 50 -21 29 20 -20 19 34 0.59 128 0 0 -20 5 17 19 1 56.5 22 35 -29 -20 32 46 -19 37 58 -20 40 5 -19 30 46 0.60 129 0 0 -19 16 44 19 1 59.4 23 35 -28 -19 44 3 -18 49 36 -19 51 19 -18 42 26 0.60 130 0 0 -18 28 44 19 2 2.4 24 34 -28 -18 55 52 -18 1 46 -19 3 5 -17 54 39 0.60 131 0 0 -17 41 16 19 2 5.6 25 34 -27 -18 8 13 -17 14 29 -18 15 24 -17 7 25 0.60 132 0 0 -16 54 24 19 2 8.9 26 33 -26 -17 21 10 -16 27 47 -17 28 18 -16 20 45 0.60 133 0 0 -16 8 8 19 2 12.4 28 33 -25 -16 34 43 -15 41 42 -16 41 48 -15 34 43 0.60 134 0 0 -15 22 30 19 2 15.9 29 32 -25 -15 48 55 -14 56 15 -15 55 57 -14 49 19 0.61 135 0 0 -14 37 32 19 2 19.6 30 32 -24 -15 3 46 -14 11 27 -15 10 45 -14 4 34 0.61 136 0 0 -13 53 15 19 2 23.5 31 31 -23 -14 19 19 -13 27 21 -14 26 15 -13 20 30 0.61 137 0 0 -13 9 40 19 2 27.4 32 31 -22 -13 35 33 -12 43 56 -13 42 27 -12 37 8 0.61 138 0 0 -12 26 49 19 2 31.5 33 30 -21 -12 52 32 -12 1 15 -12 59 22 -11 54 30 0.61 139 0 0 -11 44 42 19 2 35.6 34 30 -21 -12 10 14 -11 19 19 -12 17 2 -11 12 36 0.61 140 0 0 -11 3 21 19 2 39.9 35 29 -20 -11 28 43 -10 38 7 -11 35 28 -10 31 28 0.61 141 0 0 -10 22 46 19 2 44.2 37 28 -19 -10 47 57 - 9 57 43 -10 54 40 - 9 51 5 0.61 142 0 0 - 9 42 58 19 2 48.7 38 28 -18 -10 8 0 - 9 18 5 -10 14 39 - 9 11 30 0.61 143 0 0 - 9 3 58 19 2 53.2 39 27 -17 - 9 28 50 - 8 39 15 - 9 35 27 - 8 32 42 0.62 144 0 0 - 8 25 47 19 2 57.8 40 26 -16 - 8 50 29 - 8 1 13 - 8 57 3 - 7 54 43 0.62 145 0 0 - 7 48 25 19 3 2.5 41 26 -15 - 8 12 57 - 7 24 0 - 8 19 29 - 7 17 33 0.62 146 0 0 - 7 11 53 19 3 7.3 42 25 -14 - 7 36 16 - 6 47 38 - 7 42 45 - 6 41 13 0.62 147 0 0 - 6 36 11 19 3 12.1 43 24 -13 - 7 0 24 - 6 12 5 - 7 6 51 - 6 5 42 0.62 148 0 0 - 6 1 19 19 3 17.0 44 24 -12 - 6 25 24 - 5 37 22 - 6 31 48 - 5 31 2 0.62 149 0 0 - 5 27 19 19 3 22.0 44 23 -12 - 5 51 14 - 5 3 30 - 5 57 36 - 4 57 13 0.62 150 0 0 - 4 54 9 19 3 27.0 45 22 -11 - 5 17 56 - 4 30 29 - 5 24 16 - 4 24 14 0.62 151 0 0 - 4 21 51 19 3 32.0 46 21 -10 - 4 45 29 - 3 58 20 - 4 51 47 - 3 52 7 0.62 152 0 0 - 3 50 25 19 3 37.1 47 20 -9 - 4 13 55 - 3 27 2 - 4 20 10 - 3 20 51 0.62 153 0 0 - 3 19 50 19 3 42.3 48 19 -8 - 3 43 12 - 2 56 35 - 3 49 25 - 2 50 26 0.62 154 0 0 - 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0 2 16 0 54 1 0.63 -142 0 0 0 2 56 19 9 0.9 31 313 58 - 0 19 27 0 25 14 - 0 25 25 0 31 7 0.63 -141 0 0 - 0 20 56 19 9 4.3 30 313 59 - 0 43 25 0 1 28 - 0 49 24 0 7 23 0.63 -140 0 0 - 0 45 38 19 9 7.6 29 313 60 - 1 8 14 - 0 23 8 - 1 14 14 - 0 17 11 0.63 -139 0 0 - 1 11 10 19 9 10.8 28 313 61 - 1 33 53 - 0 48 34 - 1 39 55 - 0 42 35 0.63 -138 0 0 - 1 37 33 19 9 14.0 27 313 62 - 2 0 23 - 1 14 50 - 2 6 27 - 1 8 49 0.63 -137 0 0 - 2 4 47 19 9 17.0 26 312 63 - 2 27 44 - 1 41 57 - 2 33 50 - 1 35 54 0.63 -136 0 0 - 2 32 51 19 9 19.9 25 312 64 - 2 55 55 - 2 9 53 - 3 2 3 - 2 3 49 0.63 -135 0 0 - 3 1 46 19 9 22.8 24 312 65 - 3 24 57 - 2 38 41 - 3 31 7 - 2 32 34 0.63 -134 0 0 - 3 31 31 19 9 25.5 23 312 66 - 3 54 50 - 3 8 18 - 4 1 2 - 3 2 10 0.63 -133 0 0 - 4 2 6 19 9 28.1 22 312 67 - 4 25 33 - 3 38 45 - 4 31 47 - 3 32 35 0.63 -132 0 0 - 4 33 31 19 9 30.6 20 311 68 - 4 57 6 - 4 10 3 - 5 3 23 - 4 3 50 0.63 -131 0 0 - 5 5 46 19 9 33.0 19 311 69 - 5 29 30 - 4 42 10 - 5 35 48 - 4 35 55 0.63 -130 0 0 - 5 38 51 19 9 35.3 18 311 70 - 6 2 43 - 5 15 6 - 6 9 4 - 5 8 50 0.63 -129 0 0 - 6 12 45 19 9 37.4 17 311 71 - 6 36 46 - 5 48 52 - 6 43 9 - 5 42 33 0.63 -128 0 0 - 6 47 29 19 9 39.4 16 311 72 - 7 11 38 - 6 23 27 - 7 18 4 - 6 17 6 0.63 -127 0 0 - 7 23 1 19 9 41.3 15 310 73 - 7 47 19 - 6 58 50 - 7 53 47 - 6 52 27 0.63 -126 0 0 - 7 59 21 19 9 43.1 14 310 74 - 8 23 49 - 7 35 2 - 8 30 19 - 7 28 36 0.64 -125 0 0 - 8 36 30 19 9 44.7 13 310 75 - 9 1 6 - 8 12 1 - 9 7 39 - 8 5 33 0.64 -124 0 0 - 9 14 25 19 9 46.2 11 310 76 - 9 39 11 - 8 49 47 - 9 45 47 - 8 43 16 0.64 -123 0 0 - 9 53 7 19 9 47.6 10 310 77 -10 18 3 - 9 28 20 -10 24 41 - 9 21 47 0.64 -122 0 0 -10 32 36 19 9 48.8 9 310 77 -10 57 41 -10 7 38 -11 4 21 -10 1 3 0.64 -121 0 0 -11 12 49 19 9 49.8 8 309 78 -11 38 4 -10 47 42 -11 44 47 -10 41 4 0.64 -120 0 0 -11 53 47 19 9 50.8 7 309 79 -12 19 12 -11 28 30 -12 25 58 -11 21 49 0.65 -119 0 0 -12 35 28 19 9 51.5 5 309 79 -13 1 3 -12 10 2 -13 7 52 -12 3 18 0.65 -118 0 0 -13 17 52 19 9 52.2 4 309 79 -13 43 37 -12 52 16 -13 50 28 -12 45 30 0.66 -117 0 0 -14 0 57 19 9 52.6 3 308 79 -14 26 53 -13 35 11 -14 33 47 -13 28 22 0.68 -116 0 0 -14 44 43 19 9 52.9 2 308 79 -15 10 49 -14 18 47 -15 17 46 -14 11 55 0.71 -115 0 0 -15 29 8 19 9 53.1 1 308 79 -15 55 24 -15 3 2 -16 2 24 -14 56 8 0.88 Uncertainty in time = +/- 1 secs Prediction of 2022 Aug 20.1 Data for the target star ------------------------ * name: UCAC4-631-041134 * constellation : Auriga * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 07 19 39.4894 DE: +36 09 23.674 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 07 19 39.4895 DE: +36 09 23.674 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (546) Herodias asteroid class: approx. diameter [km]: 65 approx. diameter ["]: 0.040 distance from Earth [AU]: 2.22130 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#54 date of fit: 2022 Aug 01 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): 0.016", 0.003", 94.169° remarks: * orbital elements for (546)Herodias : Mean anomaly = 319.6157234944 deg Arg. of pericenter = 110.2525936503 deg Long. of node = 21.5869264770 deg Inclination = 14.8695055748 deg Eccentricity = 0.1153880426 Semimajor axis = 2.5965047382 AU Perihelion dist = 2.2968991388 AU Mag: H = 9.82, G = 0.15 Epoch of elements : MJD 59858.79458333 TDT (2022 Oct 06.7946) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542022Aug01,3.03,2022,10,6,19.095072,0.119093,-0.523052,11.803338,2.681175,-0.005482,0.000860,0.000000,0.000000 168.4418,36.1140,-109.41,-5.33,False UCAC4-631-041134,7.32763593,36.1565762,0.00,12.48,0.00,0.0,0,,7.35259768,36.1140268,2.25,0.00,0,0,0 546,Herodias,14.59,65.0,2.2213,0,0,3.857,10.62,,3.4,0 0,319.4285,2022,10,6,110.2526,21.5869,14.8695,0.11539,2.59650,2.29690,9.82,5.0,0.15 1.133,0.0160,0.0027,94,0.0053,Known errors,-1.00,-1,-1,-1 20221006_041134,59811.11 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Aug 20, 02:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org