IOTA/IOTA-ES occultation update for (196) Philomela / UCAC4 331-159367 event on 2023 Mar 16, 14:23 UT Visible from New Zealand Summary ------- On 2023 Mar 16 UT, the 140.1 km diameter asteroid (196) Philomela will occult a 12.3 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 0.85 mag to 12.49 mag (the magnitude of the asteroid) for at most 6.250 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: 2023 Mar 16, 14:19 - 2023 Mar 16, 14:27 * geocentric midpoint of event [JD]: 2460020.09959554 * magnitude of target star: 12.30 * magnitude drop [mag]: 0.85 * estimated maximum duration [s]: 6.250 * Moon: 34 % sunlit, 9° distance * Sun: 79° distance * rough path description: New Zealand The occultation path -------------------- * approximate projected width [km]: 171 * 1 sigma uncertainty interval [path widths]: +/- 0.21 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.022, +/- 0.013) * 1 sigma uncertainty ellipse (major, minor, PA): (0.022", 0.013", 95°) * approx speed of asteroid's shadow [km/s]: 22.4313 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 331-159367 by 196 Philomela on 2023 Mar 16 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 144 0 0 .. .. .... .. .. .. .. .. .. -29 41 54 .. .. .. -30 4 14 .. .. .. .... 145 0 0 -29 16 33 14 19 32.9 1 117 -59 -30 9 42 -28 24 4 -30 32 5 -28 2 20 .... 146 0 0 -29 44 23 14 19 33.0 2 117 -59 -30 37 38 -28 51 47 -31 0 3 -28 30 1 0.62 147 0 0 -30 12 19 14 19 33.2 3 116 -58 -31 5 40 -29 19 37 -31 28 8 -28 57 49 0.66 148 0 0 -30 40 21 14 19 33.6 4 116 -58 -31 33 49 -29 47 34 -31 56 19 -29 25 43 0.67 149 0 0 -31 8 29 14 19 34.0 5 115 -57 -32 2 2 -30 15 36 -32 24 35 -29 53 44 0.68 150 0 0 -31 36 42 14 19 34.5 6 115 -57 -32 30 20 -30 43 44 -32 52 55 -30 21 49 0.69 151 0 0 -32 4 58 14 19 35.2 7 114 -56 -32 58 42 -31 11 55 -33 21 19 -30 49 58 0.69 152 0 0 -32 33 17 14 19 35.9 7 114 -56 -33 27 6 -31 40 9 -33 49 45 -31 18 10 0.70 153 0 0 -33 1 39 14 19 36.7 8 113 -55 -33 55 32 -32 8 26 -34 18 13 -31 46 25 0.70 154 0 0 -33 30 1 14 19 37.6 9 113 -54 -34 23 58 -32 36 44 -34 46 41 -32 14 42 0.70 155 0 0 -33 58 23 14 19 38.6 10 112 -54 -34 52 24 -33 5 2 -35 15 9 -32 42 58 0.70 156 0 0 -34 26 44 14 19 39.7 11 111 -53 -35 20 50 -33 33 20 -35 43 36 -33 11 15 0.70 157 0 0 -34 55 4 14 19 40.9 12 111 -52 -35 49 13 -34 1 37 -36 12 1 -33 39 30 0.70 158 0 0 -35 23 22 14 19 42.2 13 110 -52 -36 17 34 -34 29 51 -36 40 23 -34 7 43 0.71 159 0 0 -35 51 36 14 19 43.6 14 110 -51 -36 45 51 -34 58 3 -37 8 41 -34 35 54 0.71 160 0 0 -36 19 46 14 19 45.0 15 109 -50 -37 14 3 -35 26 11 -37 36 55 -35 4 1 0.71 161 0 0 -36 47 51 14 19 46.5 16 108 -50 -37 42 10 -35 54 14 -38 5 3 -35 32 3 0.71 162 0 0 -37 15 50 14 19 48.1 17 108 -49 -38 10 11 -36 22 11 -38 33 4 -36 0 0 0.71 163 0 0 -37 43 43 14 19 49.8 18 107 -48 -38 38 5 -36 50 3 -39 0 59 -36 27 51 0.71 164 0 0 -38 11 28 14 19 51.6 19 106 -47 -39 5 51 -37 17 47 -39 28 45 -36 55 34 0.71 165 0 0 -38 39 5 14 19 53.4 20 106 -47 -39 33 28 -37 45 23 -39 56 23 -37 23 10 0.71 166 0 0 -39 6 33 14 19 55.3 20 105 -46 -40 0 56 -38 12 50 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Uncertainty in time = +/- 2 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: UCAC4 331-159367 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 27 50.0613 DE: -23 58 44.664 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 27 50.0614 DE: -23 58 44.664 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (196) Philomela asteroid class: approx. diameter [km]: 140 approx. diameter ["]: 0.062 distance from Earth [AU]: 3.09840 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#129 date of fit: 2023 Feb 09 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): 0.022", 0.013", 94.614° remarks: * orbital elements for (196)Philomela : Mean anomaly = 342.5728055138 deg Arg. of pericenter = 203.4998250968 deg Long. of node = 72.2976904449 deg Inclination = 7.2625178867 deg Eccentricity = 0.0149449723 Semimajor axis = 3.1134791331 AU Perihelion dist = 3.0669482738 AU Mag: H = 6.64, G = 0.15 Epoch of elements : MJD 60019.59972222 TDT (2023 Mar 16.5997) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1292023Feb09,6.25,2023,3,16,14.390293,-0.033674,-0.574870,12.639115,-0.741617,-0.005773,-0.000303,0.000000,0.000000 -112.4634,-23.9653,-33.69,-1.70,False UCAC4 331-159367,18.46390588,-23.9790733,0.00,12.30,0.00,0.0,0,,18.48725362,-23.9653148,0.85,0.00,0,0,0 196,Philomela,12.49,140.1,3.0984,0,0,2.618,-2.11,,8.0,0 0,342.4652,2023,3,16,203.4998,72.2977,7.2625,0.01494,3.11348,3.06695,6.65,5.0,0.15 1.209,0.0220,0.0130,95,0.0130,Known errors,-1.00,-1,-1,-1 20230316_159367,59990.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:49 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org