IOTA/IOTA-ES occultation update for (196) Philomela / UCAC4 312-220722 event on 2023 Jun 25, 13:37 UT Visible from Australia Summary ------- On 2023 Jun 25 UT, the 140.1 km diameter asteroid (196) Philomela will occult a 11.7 mag star in the constellation Sagittarius for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.42 mag to 10.89 mag (the magnitude of the asteroid) for at most 11.320 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 Jun 25, 13:29 - 2023 Jun 25, 13:46 * geocentric midpoint of event [JD]: 2460121.06813537 * magnitude of target star: 11.70 * magnitude drop [mag]: 0.42 * estimated maximum duration [s]: 11.320 * Moon: 43 % sunlit, 102° distance * Sun: 174° distance * rough path description: Australia Additional comments ------------------- low mag drop The occultation path -------------------- * approximate projected width [km]: 140 * 1 sigma uncertainty interval [path widths]: +/- 0.23 * 1 sigma uncertainty interval [seconds]: +/- 4.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.035, +/- 0.020) * 1 sigma uncertainty ellipse (major, minor, PA): (0.035", 0.020", 93°) * approx speed of asteroid's shadow [km/s]: 12.3783 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 312-220722 by 196 Philomela on 2023 Jun 25 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 65 0 0 - 8 22 48 13 46 40.7 0 118 -4 - 7 39 37 - 9 5 56 .. .. .. - 9 25 27 .... 66 0 0 - 8 54 11 13 46 40.5 1 118 -5 - 8 11 6 - 9 37 13 - 7 51 34 - 9 56 42 0.05 67 0 0 - 9 25 12 13 46 40.2 3 118 -6 - 8 42 12 -10 8 7 - 8 22 43 -10 27 33 -0.01 68 0 0 - 9 55 48 13 46 39.6 4 117 -8 - 9 12 55 -10 38 38 - 8 53 29 -10 58 0 -0.04 69 0 0 -10 26 1 13 46 38.9 5 117 -9 - 9 43 14 -11 8 44 - 9 23 51 -11 28 4 -0.05 70 0 0 -10 55 48 13 46 38.0 6 117 -10 -10 13 8 -11 38 25 - 9 53 48 -11 57 42 -0.06 71 0 0 -11 25 11 13 46 36.9 7 117 -11 -10 42 38 -12 7 41 -10 23 20 -12 26 55 -0.06 72 0 0 -11 54 8 13 46 35.6 8 117 -12 -11 11 41 -12 36 31 -10 52 26 -12 55 42 -0.07 73 0 0 -12 22 39 13 46 34.1 9 116 -13 -11 40 19 -13 4 55 -11 21 7 -13 24 4 -0.07 74 0 0 -12 50 43 13 46 32.5 10 116 -14 -12 8 30 -13 32 53 -11 49 21 -13 51 58 -0.07 75 0 0 -13 18 21 13 46 30.7 11 116 -15 -12 36 14 -14 0 24 -12 17 9 -14 19 26 -0.07 76 0 0 -13 45 31 13 46 28.7 12 116 -16 -13 3 31 -14 27 28 -12 44 29 -14 46 27 -0.07 77 0 0 -14 12 14 13 46 26.6 13 116 -17 -13 30 21 -14 54 4 -13 11 22 -15 13 0 -0.08 78 0 0 -14 38 30 13 46 24.3 14 115 -18 -13 56 43 -15 20 13 -13 37 47 -15 39 6 -0.08 79 0 0 -15 4 17 13 46 21.8 15 115 -19 -14 22 37 -15 45 53 -14 3 44 -16 4 43 -0.08 80 0 0 -15 29 36 13 46 19.2 17 115 -20 -14 48 3 -16 11 6 -14 29 13 -16 29 52 -0.08 81 0 0 -15 54 27 13 46 16.5 18 115 -21 -15 13 1 -16 35 50 -14 54 14 -16 54 33 -0.08 82 0 0 -16 18 49 13 46 13.6 19 114 -22 -15 37 30 -17 0 5 -15 18 46 -17 18 46 -0.08 83 0 0 -16 42 42 13 46 10.5 20 114 -23 -16 1 30 -17 23 52 -15 42 49 -17 42 29 -0.08 84 0 0 -17 6 7 13 46 7.4 21 114 -24 -16 25 1 -17 47 10 -16 6 23 -18 5 44 -0.08 85 0 0 -17 29 2 13 46 4.1 22 113 -25 -16 48 3 -18 9 58 -16 29 28 -18 28 30 -0.08 86 0 0 -17 51 28 13 46 0.6 23 113 -26 -17 10 35 -18 32 18 -16 52 3 -18 50 47 -0.08 87 0 0 -18 13 25 13 45 57.0 24 113 -27 -17 32 39 -18 54 9 -17 14 10 -19 12 35 -0.08 88 0 0 -18 34 53 13 45 53.3 25 113 -28 -17 54 13 -19 15 30 -17 35 47 -19 33 53 -0.08 89 0 0 -18 55 51 13 45 49.5 26 112 -29 -18 15 18 -19 36 22 -17 56 55 -19 54 43 -0.08 90 0 0 -19 16 20 13 45 45.6 27 112 -30 -18 35 53 -19 56 45 -18 17 33 -20 15 3 -0.08 91 0 0 -19 36 20 13 45 41.5 28 112 -31 -18 55 59 -20 16 39 -18 37 41 -20 34 53 -0.08 92 0 0 -19 55 50 13 45 37.3 29 111 -32 -19 15 35 -20 36 3 -18 57 20 -20 54 15 -0.08 93 0 0 -20 14 51 13 45 33.0 30 111 -33 -19 34 42 -20 54 58 -19 16 30 -21 13 7 -0.08 94 0 0 -20 33 22 13 45 28.7 31 111 -34 -19 53 19 -21 13 23 -19 35 9 -21 31 30 -0.08 95 0 0 -20 51 24 13 45 24.2 32 110 -35 -20 11 26 -21 31 19 -19 53 20 -21 49 23 -0.08 96 0 0 -21 8 57 13 45 19.6 32 110 -36 -20 29 5 -21 48 46 -20 11 0 -22 6 48 -0.08 97 0 0 -21 26 0 13 45 14.9 33 110 -37 -20 46 13 -22 5 44 -20 28 11 -22 23 43 -0.08 98 0 0 -21 42 34 13 45 10.1 34 109 -38 -21 2 53 -22 22 12 -20 44 53 -22 40 9 -0.08 99 0 0 -21 58 38 13 45 5.2 35 109 -39 -21 19 2 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55 13 29 33.3 1 241 2 16 3 32 14 36 21 16 23 19 14 16 38 0.03 -115 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 15 8 28 .. .. .. 14 48 47 .... Uncertainty in time = +/- 4 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 312-220722 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 34 58.6109 DE: -27 38 35.652 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 34 58.6109 DE: -27 38 35.652 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.7 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (196) Philomela asteroid class: approx. diameter [km]: 140 approx. diameter ["]: 0.094 distance from Earth [AU]: 2.05450 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): 0.035", 0.020", 93.112° remarks: * orbital elements for (196)Philomela : Mean anomaly = 0.6272072374 deg Arg. of pericenter = 203.5606891543 deg Long. of node = 72.2981462584 deg Inclination = 7.2627351759 deg Eccentricity = 0.0148487590 Semimajor axis = 3.1131746217 AU Perihelion dist = 3.0669478421 AU Mag: H = 6.63, G = 0.15 Epoch of elements : MJD 60120.56791667 TDT (2023 Jun 25.5679) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1302023Apr24,11.32,2023,6,25,13.635249,-0.017364,0.072378,-6.793790,-1.630373,-0.000420,0.000407,0.000001,0.000000 161.1503,-27.6247,-23.86,23.38,False UCAC4 312-220722,18.58294747,-27.6432366,0.00,11.70,0.00,0.0,0,,18.60776409,-27.6247400,0.42,0.00,0,0,0 196,Philomela,10.89,140.1,2.0545,0,0,-2.188,-6.98,,8.0,0 0,0.5253,2023,6,25,203.5607,72.2981,7.2627,0.01485,3.11317,3.06695,6.65,5.0,0.15 1.226,0.0347,0.0197,93,0.0213,Known errors,-1.00,-1,-1,-1 20230625_220722,60063.20 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org