IOTA/IOTA-ES occultation update for (19911) Rigaux / UCAC4 306-143001 event on 2024 Feb 12, 18:02 UT Visible from Summary ------- On 2024 Feb 12 UT, the 20.345 km diameter asteroid (19911) Rigaux will occult a 11.9 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.85 mag to 17.72 mag (the magnitude of the asteroid) for at most 0.570 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: 97 * date and approx. time of event: 2024 Feb 12, 17:59 - 2024 Feb 12, 18:05 * geocentric midpoint of event [JD]: 2460353.25192300 * magnitude of target star: 11.87 * magnitude drop [mag]: 5.85 * estimated maximum duration [s]: 0.570 * Moon: 11 % sunlit, 93° distance * Sun: 55° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 20 * 1 sigma uncertainty interval [path widths]: +/- 0.38 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.004", 103°) * approx speed of asteroid's shadow [km/s]: 35.5858 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 306-143001 by 19911 Rigaux on 2024 Feb 12 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 133 0 0 10 36 7 17 59 46.9 1 120 -51 10 29 47 10 42 28 10 25 0 10 47 14 .... 134 0 0 10 2 23 17 59 47.0 2 120 -50 9 56 2 10 8 44 9 51 15 10 13 31 0.07 135 0 0 9 28 23 17 59 47.1 3 120 -49 9 22 1 9 34 44 9 17 13 9 39 32 0.04 136 0 0 8 54 7 17 59 47.3 4 120 -48 8 47 44 9 0 29 8 42 57 9 5 17 0.02 137 0 0 8 19 36 17 59 47.6 5 120 -47 8 13 14 8 25 59 8 8 25 8 30 47 0.02 138 0 0 7 44 53 17 59 48.0 6 120 -46 7 38 29 7 51 16 7 33 41 7 56 4 0.01 139 0 0 7 9 56 17 59 48.4 8 120 -45 7 3 32 7 16 20 6 58 43 7 21 9 0.01 140 0 0 6 34 48 17 59 48.9 9 121 -44 6 28 24 6 41 12 6 23 35 6 46 2 0.00 141 0 0 5 59 30 17 59 49.5 10 121 -43 5 53 5 6 5 54 5 48 16 6 10 44 0.00 142 0 0 5 24 2 17 59 50.2 11 121 -42 5 17 37 5 30 26 5 12 47 5 35 16 0.00 143 0 0 4 48 25 17 59 50.9 12 121 -41 4 42 0 4 54 50 4 37 10 4 59 40 0.00 144 0 0 4 12 41 17 59 51.7 13 121 -39 4 6 16 4 19 7 4 1 26 4 23 57 0.00 145 0 0 3 36 51 17 59 52.6 15 121 -38 3 30 26 3 43 17 3 25 35 3 48 7 0.00 146 0 0 3 0 56 17 59 53.5 16 121 -37 2 54 30 3 7 22 2 49 40 3 12 12 -0.01 147 0 0 2 24 57 17 59 54.6 17 121 -36 2 18 31 2 31 23 2 13 41 2 36 13 -0.01 148 0 0 1 48 55 17 59 55.7 18 121 -35 1 42 29 1 55 21 1 37 38 2 0 11 -0.01 149 0 0 1 12 51 17 59 56.8 19 121 -34 1 6 25 1 19 17 1 1 34 1 24 7 -0.01 150 0 0 0 36 46 17 59 58.1 20 121 -33 0 30 21 0 43 12 0 25 30 0 48 3 -0.01 151 0 0 0 0 43 17 59 59.4 22 121 -32 - 0 5 43 0 7 8 - 0 10 34 0 11 59 -0.01 152 0 0 - 0 35 20 18 0 0.8 23 121 -30 - 0 41 45 - 0 28 54 - 0 46 36 - 0 24 3 -0.01 153 0 0 - 1 11 19 18 0 2.2 24 121 -29 - 1 17 44 - 1 4 53 - 1 22 35 - 1 0 3 -0.01 154 0 0 - 1 47 14 18 0 3.7 25 121 -28 - 1 53 40 - 1 40 49 - 1 58 30 - 1 35 59 -0.01 155 0 0 - 2 23 5 18 0 5.3 26 121 -27 - 2 29 30 - 2 16 39 - 2 34 20 - 2 11 49 -0.01 156 0 0 - 2 58 48 18 0 7.0 27 121 -26 - 3 5 13 - 2 52 24 - 3 10 3 - 2 47 34 -0.01 157 0 0 - 3 34 25 18 0 8.7 29 121 -25 - 3 40 50 - 3 28 1 - 3 45 39 - 3 23 11 -0.01 158 0 0 - 4 9 53 18 0 10.4 30 121 -24 - 4 16 17 - 4 3 29 - 4 21 7 - 3 58 40 -0.01 159 0 0 - 4 45 12 18 0 12.3 31 121 -22 - 4 51 35 - 4 38 48 - 4 56 24 - 4 33 59 -0.01 160 0 0 - 5 20 19 18 0 14.2 32 121 -21 - 5 26 43 - 5 13 56 - 5 31 32 - 5 9 7 -0.01 161 0 0 - 5 55 16 18 0 16.1 33 121 -20 - 6 1 38 - 5 48 53 - 6 6 27 - 5 44 4 -0.01 162 0 0 - 6 29 59 18 0 18.1 34 121 -19 - 6 36 21 - 6 23 37 - 6 41 9 - 6 18 49 -0.01 163 0 0 - 7 4 29 18 0 20.2 36 121 -18 - 7 10 50 - 6 58 7 - 7 15 38 - 6 53 19 -0.01 164 0 0 - 7 38 44 18 0 22.3 37 120 -17 - 7 45 5 - 7 32 22 - 7 49 52 - 7 27 35 -0.01 165 0 0 - 8 12 43 18 0 24.5 38 120 -16 - 8 19 3 - 8 6 22 - 8 23 50 - 8 1 36 -0.01 166 0 0 - 8 46 25 18 0 26.7 39 120 -15 - 8 52 45 - 8 40 6 - 8 57 32 - 8 35 19 -0.01 167 0 0 - 9 19 51 18 0 29.0 40 120 -13 - 9 26 10 - 9 13 31 - 9 30 56 - 9 8 46 -0.01 168 0 0 - 9 52 57 18 0 31.3 41 120 -12 - 9 59 16 - 9 46 39 -10 4 1 - 9 41 54 -0.02 169 0 0 -10 25 45 18 0 33.7 42 120 -11 -10 32 3 -10 19 27 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- 58 0 0 -12 39 4 18 5 43.3 8 242 61 -12 45 18 -12 32 51 -12 50 0 -12 28 9 0.00 - 57 0 0 -12 8 2 18 5 43.7 7 242 60 -12 14 16 -12 1 47 -12 18 59 -11 57 5 0.00 - 56 0 0 -11 36 38 18 5 44.1 6 242 59 -11 42 53 -11 30 22 -11 47 36 -11 25 39 0.01 - 55 0 0 -11 4 52 18 5 44.5 5 242 58 -11 11 8 -10 58 36 -11 15 51 -10 53 52 0.01 - 54 0 0 -10 32 46 18 5 44.8 4 241 57 -10 39 3 -10 26 29 -10 43 47 -10 21 45 0.02 - 53 0 0 -10 0 20 18 5 45.0 3 241 56 -10 6 38 - 9 54 3 -10 11 22 - 9 49 18 0.04 - 52 0 0 - 9 27 36 18 5 45.1 2 241 55 - 9 33 54 - 9 21 18 - 9 38 39 - 9 16 33 0.07 - 51 0 0 - 8 54 33 18 5 45.2 1 241 54 - 9 0 52 - 8 48 15 - 9 5 38 - 8 43 29 0.25 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 13.2 Data for the target star ------------------------ * name: UCAC4 306-143001 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 52 25.5623 DE: -28 48 32.426 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 52 25.5623 DE: -28 48 32.426 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.9 * B mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (19911) Rigaux asteroid class: approx. diameter [km]: 20 approx. diameter ["]: 0.010 distance from Earth [AU]: 2.86490 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#45 date of fit: 2023 Apr 25 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): 0.018", 0.004", 102.585° remarks: * orbital elements for (19911)Rigaux : Mean anomaly = 34.7591035770 deg Arg. of pericenter = 144.5120529286 deg Long. of node = 44.0367232522 deg Inclination = 14.7934579930 deg Eccentricity = 0.2938766249 Semimajor axis = 3.0468818995 AU Perihelion dist = 2.1514745303 AU Mag: H = 12.52, G = 0.15 Epoch of elements : MJD 60352.75192292 TDT (2024 Feb 12.7519) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#452023Apr25,0.57,2024,2,12,18.046152,0.005188,0.022760,19.707876,-3.877048,-0.004760,-0.000260,-0.000001,0.000000 -144.4981,-28.8150,-87.14,-13.68,False UCAC4 306-143001,17.87376725,-28.8090073,12.17,11.87,11.71,0.0,0,,17.89894462,-28.8149920,5.85,5.57,0,0,0 19911,Rigaux,17.72,20.345,2.8649,0,0,4.603,-11.90,,1.2,0 0,34.6198,2024,2,12,144.5121,44.0367,14.7935,0.29388,3.04688,2.15147,12.52,5.0,0.15 1.377,0.0183,0.0037,103,0.0037,Known errors,0.87,0,-1,-1 20240212_143001,60138.17 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 13, 04:00 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org