IOTA/IOTA-ES occultation update for (196) Philomela / UCAC4 308-203192 event on 2023 Jul 18, 22:50 UT Visible from Africa, South America Summary ------- On 2023 Jul 18 UT, the 140.1 km diameter asteroid (196) Philomela will occult a 12.2 mag star in the constellation Sagittarius for observers along a path across Africa, South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.36 mag to 11.22 mag (the magnitude of the asteroid) for at most 13.670 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 Jul 18, 22:40 - 2023 Jul 18, 23:00 * geocentric midpoint of event [JD]: 2460144.45179013 * magnitude of target star: 12.24 * magnitude drop [mag]: 0.36 * estimated maximum duration [s]: 13.670 * Moon: 1 % sunlit, 145° distance * Sun: 157° distance * rough path description: Africa, South America The occultation path -------------------- * approximate projected width [km]: 148 * 1 sigma uncertainty interval [path widths]: +/- 0.22 * 1 sigma uncertainty interval [seconds]: +/- 4.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.034, +/- 0.020) * 1 sigma uncertainty ellipse (major, minor, PA): (0.034", 0.019", 96°) * approx speed of asteroid's shadow [km/s]: 10.2500 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 308-203192 by 196 Philomela on 2023 Jul 18 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 - 92 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 9 19 40 .. .. .. 8 59 12 .... - 91 0 0 9 33 9 23 0 22.1 1 119 20 10 19 30 8 47 2 10 40 13 8 26 37 .... - 90 0 0 9 0 41 23 0 21.7 2 119 19 9 46 56 8 14 42 10 7 35 7 54 19 -0.19 - 89 0 0 8 28 32 23 0 21.1 3 119 17 9 14 40 7 42 40 9 35 16 7 22 20 -0.26 - 88 0 0 7 56 42 23 0 20.3 4 120 16 8 42 42 7 10 57 9 3 15 6 50 40 -0.29 - 87 0 0 7 25 12 23 0 19.2 6 120 15 8 11 5 6 39 34 8 31 34 6 19 21 -0.30 - 86 0 0 6 54 2 23 0 17.8 7 120 14 7 39 47 6 8 31 8 0 14 5 48 21 -0.31 - 85 0 0 6 23 13 23 0 16.2 8 120 13 7 8 51 5 37 50 7 29 14 5 17 43 -0.32 - 84 0 0 5 52 47 23 0 14.4 9 120 12 6 38 17 5 7 31 6 58 36 4 47 28 -0.33 - 83 0 0 5 22 42 23 0 12.3 10 120 11 6 8 5 4 37 34 6 28 21 4 17 34 -0.33 - 82 0 0 4 53 2 23 0 10.0 11 120 10 5 38 17 4 8 1 5 58 29 3 48 4 -0.34 - 81 0 0 4 23 44 23 0 7.5 12 120 9 5 8 52 3 38 52 5 29 1 3 18 58 -0.34 - 80 0 0 3 54 51 23 0 4.7 13 120 8 4 39 51 3 10 6 4 59 56 2 50 17 -0.34 - 79 0 0 3 26 24 23 0 1.7 14 120 6 4 11 15 2 41 46 4 31 17 2 22 0 -0.34 - 78 0 0 2 58 21 22 59 58.5 15 121 5 3 43 5 2 13 51 4 3 3 1 54 8 -0.35 - 77 0 0 2 30 44 22 59 55.1 16 121 4 3 15 20 1 46 22 3 35 15 1 26 42 -0.35 - 76 0 0 2 3 33 22 59 51.4 18 121 3 2 48 1 1 19 19 3 7 52 0 59 43 -0.35 - 75 0 0 1 36 49 22 59 47.6 19 121 2 2 21 9 0 52 43 2 40 57 0 33 10 -0.35 - 74 0 0 1 10 32 22 59 43.5 20 121 1 1 54 45 0 26 33 2 14 29 0 7 4 -0.35 - 73 0 0 0 44 43 22 59 39.3 21 121 0 1 28 47 0 0 51 1 48 28 - 0 18 35 -0.35 - 72 0 0 0 19 21 22 59 34.8 22 121 -1 1 3 18 - 0 24 23 1 22 55 - 0 43 46 -0.35 - 71 0 0 - 0 5 33 22 59 30.2 23 121 -2 0 38 16 - 0 49 9 0 57 50 - 1 8 29 -0.35 - 70 0 0 - 0 29 59 22 59 25.3 24 121 -3 0 13 43 - 1 13 27 0 33 13 - 1 32 44 -0.35 - 69 0 0 - 0 53 56 22 59 20.3 25 121 -4 - 0 10 22 - 1 37 17 0 9 6 - 1 56 30 -0.35 - 68 0 0 - 1 17 24 22 59 15.1 26 121 -5 - 0 33 57 - 2 0 38 - 0 14 33 - 2 19 48 -0.35 - 67 0 0 - 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Uncertainty in time = +/- 5 secs Prediction of 2023 May 29.0 Data for the target star ------------------------ * name: UCAC4 308-203192 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 15 17.9158 DE: -28 26 31.918 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 15 17.9158 DE: -28 26 31.918 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (196) Philomela asteroid class: approx. diameter [km]: 140 approx. diameter ["]: 0.092 distance from Earth [AU]: 2.10530 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#130 date of fit: 2023 Apr 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): 0.034", 0.019", 95.842° remarks: * orbital elements for (196)Philomela : Mean anomaly = 4.8030677389 deg Arg. of pericenter = 203.5812031752 deg Long. of node = 72.2983659713 deg Inclination = 7.2627912026 deg Eccentricity = 0.0148225144 Semimajor axis = 3.1130926187 AU Perihelion dist = 3.0669487587 AU Mag: H = 6.63, G = 0.15 Epoch of elements : MJD 60143.95152778 TDT (2023 Jul 18.9515) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1302023Apr24,13.67,2023,7,18,22.842963,-0.045054,0.326173,-5.731090,-0.790668,0.002142,0.000520,0.000001,0.000000 -4.9294,-28.4352,-161.07,20.93,False UCAC4 308-203192,18.25497663,-28.4421995,0.00,12.24,0.00,0.0,0,,18.28005625,-28.4352246,0.36,0.00,0,0,0 196,Philomela,11.22,140.1,2.1053,0,0,-1.814,-3.30,,8.0,0 0,4.6323,2023,7,18,203.5812,72.2984,7.2628,0.01482,3.11309,3.06695,6.63,5.0,0.15 1.222,0.0337,0.0193,96,0.0204,Known errors,-1.00,-1,-1,-1 20230718_203192,60092.98 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 28, 23:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org