IOTA/IOTA-ES occultation update for (755) Quintilla / UCAC4 473-001338 event on 2023 Oct 11, 04:38 UT Visible from E Canada, USA, Mexico Summary ------- On 2023 Oct 11 UT, the 36.4 km diameter asteroid (755) Quintilla will occult a 14.1 mag star in the constellation Pisces for observers along a path across E Canada, USA, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.10 mag to 14.69 mag (the magnitude of the asteroid) for at most 2.430 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: 100 * date and approx. time of event: 2023 Oct 11, 04:32 - 2023 Oct 11, 04:43 * geocentric midpoint of event [JD]: 2460228.69315013 * magnitude of target star: 14.08 * magnitude drop [mag]: 1.10 * estimated maximum duration [s]: 2.430 * Moon: 11 % sunlit, 144° distance * Sun: 177° distance * rough path description: E Canada, USA, Mexico The occultation path -------------------- * approximate projected width [km]: 49 * 1 sigma uncertainty interval [path widths]: +/- 0.05 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.007, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.007", 0.001", 71°) * approx speed of asteroid's shadow [km/s]: 15.0284 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 473-001338 by 755 Quintilla on 2023 Oct 11 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 -167 0 0 16 22 54 4 43 24.5 0 85 1 16 36 13 16 9 37 16 37 32 16 8 18 .... -166 0 0 16 28 11 4 43 24.4 1 85 0 16 41 31 16 14 54 16 42 50 16 13 35 -0.53 -165 0 0 16 34 3 4 43 24.1 2 86 -1 16 47 24 16 20 45 16 48 44 16 19 27 -0.70 -164 0 0 16 40 31 4 43 23.7 3 86 -2 16 53 53 16 27 12 16 55 12 16 25 53 -0.76 -163 0 0 16 47 33 4 43 23.1 4 86 -3 17 0 56 16 34 14 17 2 15 16 32 55 -0.80 -162 0 0 16 55 10 4 43 22.4 5 87 -4 17 8 34 16 41 50 17 9 53 16 40 31 -0.81 -161 0 0 17 3 22 4 43 21.5 6 87 -5 17 16 46 16 50 1 17 18 6 16 48 42 -0.83 -160 0 0 17 12 8 4 43 20.4 7 87 -6 17 25 34 16 58 46 17 26 53 16 57 27 -0.84 -159 0 0 17 21 29 4 43 19.2 8 88 -7 17 34 55 17 8 5 17 36 15 17 6 46 -0.84 -158 0 0 17 31 23 4 43 17.8 9 88 -8 17 44 51 17 17 59 17 46 11 17 16 39 -0.85 -157 0 0 17 41 52 4 43 16.3 10 88 -9 17 55 21 17 28 26 17 56 41 17 27 6 -0.85 -156 0 0 17 52 54 4 43 14.6 11 88 -10 18 6 25 17 39 27 18 7 45 17 38 7 -0.86 -155 0 0 18 4 30 4 43 12.7 12 89 -11 18 18 2 17 51 1 18 19 22 17 49 42 -0.86 -154 0 0 18 16 40 4 43 10.7 13 89 -12 18 30 13 18 3 9 18 31 34 18 1 49 -0.86 -153 0 0 18 29 22 4 43 8.6 13 90 -13 18 42 57 18 15 50 18 44 18 18 14 30 -0.86 -152 0 0 18 42 38 4 43 6.2 14 90 -14 18 56 14 18 29 4 18 57 35 18 27 44 -0.86 -151 0 0 18 56 26 4 43 3.8 15 90 -15 19 10 4 18 42 51 19 11 25 18 41 30 -0.87 -150 0 0 19 10 47 4 43 1.2 16 91 -15 19 24 27 18 57 10 19 25 48 18 55 49 -0.87 -149 0 0 19 25 40 4 42 58.4 17 91 -16 19 39 22 19 12 1 19 40 43 19 10 40 -0.87 -148 0 0 19 41 5 4 42 55.5 18 91 -17 19 54 49 19 27 24 19 56 10 19 26 3 -0.87 -147 0 0 19 57 2 4 42 52.4 19 92 -18 20 10 48 19 43 19 20 12 9 19 41 58 -0.87 -146 0 0 20 13 30 4 42 49.2 20 92 -19 20 27 18 19 59 45 20 28 40 19 58 24 -0.87 -145 0 0 20 30 29 4 42 45.8 21 93 -20 20 44 20 20 16 42 20 45 42 20 15 21 -0.87 -144 0 0 20 48 0 4 42 42.3 22 93 -21 21 1 52 20 34 10 21 3 15 20 32 49 -0.87 -143 0 0 21 6 1 4 42 38.7 23 94 -22 21 19 55 20 52 9 21 21 18 20 50 47 -0.87 -142 0 0 21 24 32 4 42 34.9 24 94 -23 21 38 29 21 10 38 21 39 52 21 9 16 -0.87 -141 0 0 21 43 33 4 42 31.0 24 95 -24 21 57 32 21 29 36 21 58 55 21 28 14 -0.87 -140 0 0 22 3 3 4 42 26.9 25 95 -25 22 17 5 21 49 4 22 18 28 21 47 42 -0.88 -139 0 0 22 23 3 4 42 22.7 26 96 -26 22 37 7 22 9 2 22 38 31 22 7 39 -0.88 -138 0 0 22 43 31 4 42 18.4 27 97 -26 22 57 38 22 29 27 22 59 2 22 28 4 -0.88 -137 0 0 23 4 28 4 42 13.9 28 97 -27 23 18 37 22 50 21 23 20 1 22 48 58 -0.88 -136 0 0 23 25 52 4 42 9.3 29 98 -28 23 40 5 23 11 43 23 41 29 23 10 20 -0.88 -135 0 0 23 47 44 4 42 4.6 30 98 -29 24 1 59 23 33 32 24 3 24 23 32 9 -0.88 -134 0 0 24 10 3 4 41 59.8 30 99 -30 24 24 21 23 55 49 24 25 46 23 54 24 -0.88 -133 0 0 24 32 49 4 41 54.8 31 100 -31 24 47 9 24 18 31 24 48 34 24 17 7 -0.88 -132 0 0 24 56 0 4 41 49.8 32 101 -32 25 10 23 24 41 40 25 11 49 24 40 15 -0.88 -131 0 0 25 19 37 4 41 44.6 33 101 -32 25 34 3 25 5 14 25 35 29 25 3 49 -0.88 -130 0 0 25 43 39 4 41 39.3 34 102 -33 25 58 8 25 29 13 25 59 34 25 27 48 -0.88 -129 0 0 26 8 5 4 41 33.9 34 103 -34 26 22 37 25 53 36 26 24 4 25 52 11 -0.88 -128 0 0 26 32 55 4 41 28.4 35 104 -35 26 47 30 26 18 23 26 48 57 26 16 57 -0.88 -127 0 0 26 58 8 4 41 22.8 36 105 -36 27 12 46 26 43 33 27 14 13 26 42 7 -0.88 -126 0 0 27 23 44 4 41 17.1 37 106 -36 27 38 25 27 9 6 27 39 53 27 7 40 -0.88 -125 0 0 27 49 42 4 41 11.3 37 107 -37 28 4 26 27 35 1 28 5 54 27 33 34 -0.88 -124 0 1 28 16 1 4 41 5.4 38 108 -38 28 30 48 28 1 17 28 32 16 27 59 50 -0.88 -123 0 1 28 42 40 4 40 59.4 39 109 -39 28 57 31 28 27 53 28 58 59 28 26 26 -0.88 -122 0 1 29 9 40 4 40 53.4 39 110 -39 29 24 34 28 54 50 29 26 2 28 53 22 -0.88 -121 0 1 29 36 59 4 40 47.2 40 111 -40 29 51 56 29 22 5 29 53 24 29 20 37 -0.88 -120 0 1 30 4 36 4 40 41.0 41 112 -41 30 19 36 29 49 40 30 21 5 29 48 11 -0.88 -119 0 1 30 32 31 4 40 34.8 41 113 -41 30 47 34 30 17 31 30 49 3 30 16 3 -0.89 -118 0 1 31 0 42 4 40 28.4 42 114 -42 31 15 49 30 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18 34 67 46 34 67 17 15 -0.99 23 0 1 67 28 17 4 32 53.8 2 277 -5 67 41 40 67 14 56 67 42 59 67 13 37 -1.01 24 0 1 67 24 26 4 32 53.6 2 278 -4 67 37 50 67 11 4 67 39 10 67 9 45 -1.04 25 0 1 67 20 20 4 32 53.5 1 279 -4 67 33 46 67 6 57 67 35 5 67 5 38 -1.10 26 0 1 67 15 59 4 32 53.5 1 280 -3 67 29 26 67 2 34 67 30 46 67 1 15 -1.20 27 0 1 67 11 23 4 32 53.4 0 281 -3 67 24 51 66 57 57 67 26 12 66 56 37 -1.52 28 0 0 .. .. .... .. .. .. .. .. .. 67 20 2 .. .. .. 67 21 22 .. .. .. .... Uncertainty in time = +/- 1 secs Prediction of 2023 Sep 10.7 Data for the target star ------------------------ * name: UCAC4 473-001338 * constellation : Pisces * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 00 57 18.5510 DE: +04 32 15.700 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 00 57 18.5510 DE: +04 32 15.700 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 14.1 * B mag [mag]: 15.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (755) Quintilla asteroid class: approx. diameter [km]: 36 approx. diameter ["]: 0.020 distance from Earth [AU]: 2.56440 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#60 date of fit: 2023 Aug 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): 0.007", 0.001", 70.7° remarks: * orbital elements for (755)Quintilla : Mean anomaly = 146.4240108660 deg Arg. of pericenter = 45.0535240221 deg Long. of node = 176.6612020647 deg Inclination = 3.2426019615 deg Eccentricity = 0.1353286459 Semimajor axis = 3.1874786169 AU Perihelion dist = 2.7561214518 AU Mag: H = 9.76, G = 0.15 Epoch of elements : MJD 60228.19307750 TDT (2023 Oct 11.1931) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#602023Aug24,2.43,2023,10,11,4.635603,-0.286679,0.601664,-7.657142,-3.649612,0.000148,0.000223,0.000001,0.000001 -74.4143,4.6678,107.19,-6.91,False UCAC4 473-001338,0.95515305,4.5376945,15.06,14.08,13.55,0.0,0,,0.97584133,4.6677972,1.10,1.15,0,0,0 755,Quintilla,14.69,36.445,2.5644,0,0,-1.756,-12.51,,2.4,0 0,146.3906,2023,10,11,45.0535,176.6612,3.2426,0.13533,3.18748,2.75612,9.76,5.0,0.15 1.049,0.0073,0.0006,71,0.0074,Known errors,0.99,0,-1,-1 20231011_001338,60197.68 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Sep 10, 16:12 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org