IOTA/IOTA-ES occultation update for (495) Eulalia / TYC 1342-00333-1 event on 2024 Sep 17, 21:05 UT Visible from Summary ------- On 2024 Sep 17 UT, the 38.6518537695666 km diameter asteroid (495) Eulalia will occult a 9.3 mag star in the constellation Gemini for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.45 mag to 15.78 mag (the magnitude of the asteroid) for at most 1.550 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: 2024 Sep 17, 21:01 - 2024 Sep 17, 21:09 * geocentric midpoint of event [JD]: 2460571.37859192 * magnitude of target star: 9.33 * magnitude drop [mag]: 6.45 * estimated maximum duration [s]: 1.550 * Moon: 100 % sunlit, 107° distance * Sun: 75° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 44 * 1 sigma uncertainty interval [path widths]: +/- 0.12 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.019, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.003", 95°) * approx speed of asteroid's shadow [km/s]: 25.2866 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1342-00333-1 by 495 Eulalia on 2024 Sep 17 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 45 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 31 23 44 .. .. .. 31 26 52 .... 46 0 0 31 34 17 21 1 25.4 1 66 -57 31 21 11 31 47 25 31 18 3 31 50 33 .... 47 0 0 31 57 50 21 1 25.5 2 66 -56 31 44 44 32 10 57 31 41 36 32 14 6 -0.47 48 0 0 32 21 13 21 1 25.7 3 67 -56 32 8 8 32 34 20 32 5 0 32 37 29 -0.48 49 0 0 32 44 27 21 1 25.9 4 67 -55 32 31 22 32 57 33 32 28 14 33 0 42 -0.49 50 0 0 33 7 30 21 1 26.3 5 68 -55 32 54 26 33 20 37 32 51 18 33 23 45 -0.50 51 0 0 33 30 23 21 1 26.7 6 69 -54 33 17 19 33 43 29 33 14 12 33 46 37 -0.50 52 0 0 33 53 5 21 1 27.2 6 69 -53 33 40 2 34 6 10 33 36 55 34 9 18 -0.50 53 0 0 34 15 36 21 1 27.7 7 70 -53 34 2 33 34 28 40 33 59 26 34 31 48 -0.50 54 0 0 34 37 54 21 1 28.3 8 70 -52 34 24 52 34 50 58 34 21 45 34 54 5 -0.50 55 0 0 35 0 0 21 1 29.0 9 71 -52 34 46 58 35 13 3 34 43 52 35 16 10 -0.50 56 0 0 35 21 53 21 1 29.8 10 71 -51 35 8 52 35 34 55 35 5 46 35 38 2 -0.51 57 0 0 35 43 32 21 1 30.6 11 72 -50 35 30 32 35 56 34 35 27 26 35 59 41 -0.51 58 0 0 36 4 58 21 1 31.4 12 73 -50 35 51 59 36 17 59 35 48 53 36 21 6 -0.51 59 0 0 36 26 10 21 1 32.4 13 73 -49 36 13 12 36 39 10 36 10 6 36 42 17 -0.51 60 0 0 36 47 8 21 1 33.4 14 74 -48 36 34 10 37 0 7 36 31 5 37 3 13 -0.51 61 0 0 37 7 51 21 1 34.4 14 74 -48 36 54 54 37 20 48 36 51 49 37 23 55 -0.51 62 0 0 37 28 18 21 1 35.5 15 75 -47 37 15 23 37 41 15 37 12 18 37 44 21 -0.51 63 0 0 37 48 30 21 1 36.7 16 76 -46 37 35 36 38 1 26 37 32 31 38 4 32 -0.51 64 0 0 38 8 27 21 1 37.9 17 76 -46 37 55 34 38 21 22 37 52 29 38 24 27 -0.51 65 0 0 38 28 8 21 1 39.2 18 77 -45 38 15 16 38 41 1 38 12 11 38 44 6 -0.51 66 0 0 38 47 32 21 1 40.5 19 78 -44 38 34 41 39 0 25 38 31 37 39 3 29 -0.51 67 0 0 39 6 40 21 1 41.9 20 78 -44 38 53 50 39 19 31 38 50 46 39 22 36 -0.51 68 0 0 39 25 31 21 1 43.3 20 79 -43 39 12 43 39 38 21 39 9 39 39 41 26 -0.51 69 0 0 39 44 5 21 1 44.8 21 80 -42 39 31 18 39 56 54 39 28 15 39 59 58 -0.51 70 0 0 40 2 23 21 1 46.3 22 80 -42 39 49 37 40 15 10 39 46 34 40 18 14 -0.51 71 0 0 40 20 23 21 1 47.8 23 81 -41 40 7 38 40 33 9 40 4 35 40 36 12 -0.51 72 0 0 40 38 5 21 1 49.4 24 82 -40 40 25 21 40 50 50 40 22 19 40 53 53 -0.51 73 0 0 40 55 30 21 1 51.1 24 83 -39 40 42 47 41 8 13 40 39 45 41 11 16 -0.51 74 0 0 41 12 36 21 1 52.8 25 83 -39 40 59 55 41 25 19 40 56 54 41 28 21 -0.51 75 0 0 41 29 25 21 1 54.5 26 84 -38 41 16 46 41 42 7 41 13 44 41 45 9 -0.51 76 0 0 41 45 56 21 1 56.3 27 85 -37 41 33 18 41 58 36 41 30 17 42 1 38 -0.51 77 0 0 42 2 9 21 1 58.1 28 86 -37 41 49 32 42 14 48 41 46 31 42 17 49 -0.51 78 0 0 42 18 3 21 1 59.9 28 87 -36 42 5 28 42 30 41 42 2 27 42 33 42 -0.51 79 0 0 42 33 39 21 2 1.8 29 87 -35 42 21 5 42 46 15 42 18 5 42 49 16 -0.51 80 0 0 42 48 57 21 2 3.7 30 88 -34 42 36 24 43 1 32 42 33 24 43 4 32 -0.51 81 0 0 43 3 56 21 2 5.6 31 89 -34 42 51 25 43 16 29 42 48 25 43 19 30 -0.51 82 0 0 43 18 37 21 2 7.6 31 90 -33 43 6 6 43 31 8 43 3 7 43 34 8 -0.51 83 0 0 43 32 59 21 2 9.6 32 91 -32 43 20 30 43 45 29 43 17 31 43 48 29 -0.51 84 0 0 43 47 2 21 2 11.6 33 91 -32 43 34 34 43 59 31 43 31 35 44 2 30 -0.51 85 0 0 44 0 46 21 2 13.7 33 92 -31 43 48 20 44 13 14 43 45 21 44 16 13 -0.51 86 0 0 44 14 12 21 2 15.8 34 93 -30 44 1 47 44 26 38 43 58 49 44 29 37 -0.51 87 0 0 44 27 19 21 2 17.9 35 94 -29 44 14 55 44 39 44 44 11 57 44 42 42 -0.51 88 0 0 44 40 7 21 2 20.0 36 95 -29 44 27 44 44 52 30 44 24 47 44 55 28 -0.51 89 0 0 44 52 36 21 2 22.2 36 96 -28 44 40 15 45 4 58 44 37 18 45 7 56 -0.51 90 0 0 45 4 46 21 2 24.4 37 97 -27 44 52 26 45 17 7 44 49 30 45 20 5 -0.51 91 0 0 45 16 38 21 2 26.6 38 98 -27 45 4 19 45 28 57 45 1 23 45 31 54 -0.51 92 0 0 45 28 10 21 2 28.8 38 99 -26 45 15 53 45 40 29 45 12 57 45 43 26 -0.51 93 0 0 45 39 24 21 2 31.1 39 100 -25 45 27 8 45 51 41 45 24 13 45 54 38 -0.51 94 0 0 45 50 19 21 2 33.4 40 101 -25 45 38 5 46 2 35 45 35 9 46 5 32 -0.51 95 0 0 46 0 56 21 2 35.7 40 102 -24 45 48 42 46 13 11 45 45 47 46 16 7 -0.51 96 0 0 46 11 14 21 2 38.0 41 103 -23 45 59 1 46 23 27 45 56 6 46 26 23 -0.51 97 0 0 46 21 12 21 2 40.4 42 104 -22 46 9 1 46 33 25 46 6 7 46 36 20 -0.51 98 0 0 46 30 53 21 2 42.7 42 105 -22 46 18 43 46 43 4 46 15 49 46 45 59 -0.51 99 0 0 46 40 14 21 2 45.1 43 106 -21 46 28 6 46 52 25 46 25 12 46 55 19 -0.51 100 0 0 46 49 17 21 2 47.5 43 107 -20 46 37 10 47 1 27 46 34 16 47 4 21 -0.51 101 0 0 46 58 2 21 2 49.9 44 108 -20 46 45 55 47 10 10 46 43 2 47 13 4 -0.51 102 0 0 47 6 28 21 2 52.3 45 109 -19 46 54 22 47 18 35 46 51 29 47 21 29 -0.51 103 0 0 47 14 35 21 2 54.8 45 110 -18 47 2 31 47 26 41 46 59 38 47 29 35 -0.51 104 0 0 47 22 24 21 2 57.3 46 111 -18 47 10 21 47 34 29 47 7 28 47 37 23 -0.51 105 0 0 47 29 55 21 2 59.7 46 112 -17 47 17 52 47 41 59 47 14 59 47 44 52 -0.51 106 0 0 47 37 7 21 3 2.2 47 113 -16 47 25 5 47 49 10 47 22 13 47 52 3 -0.51 107 0 0 47 44 1 21 3 4.8 48 114 -16 47 32 0 47 56 3 47 29 8 47 58 56 -0.51 108 0 0 47 50 36 21 3 7.3 48 116 -15 47 38 36 48 2 37 47 35 44 48 5 30 -0.51 109 0 0 47 56 53 21 3 9.8 49 117 -14 47 44 54 48 8 54 47 42 2 48 11 46 -0.51 110 0 0 48 2 52 21 3 12.4 49 118 -14 47 50 54 48 14 52 47 48 2 48 17 44 -0.51 111 0 0 48 8 33 21 3 15.0 50 119 -13 47 56 36 48 20 32 47 53 44 48 23 24 -0.51 112 0 0 48 13 56 21 3 17.5 50 121 -12 48 1 59 48 25 54 47 59 8 48 28 46 -0.51 113 0 0 48 19 1 21 3 20.1 51 122 -12 48 7 4 48 30 58 48 4 13 48 33 50 -0.51 114 0 0 48 23 47 21 3 22.7 51 123 -11 48 11 51 48 35 44 48 9 0 48 38 35 -0.51 115 0 0 48 28 15 21 3 25.4 52 124 -10 48 16 20 48 40 12 48 13 30 48 43 3 -0.51 116 0 0 48 32 26 21 3 28.0 52 126 -10 48 20 32 48 44 22 48 17 41 48 47 13 -0.51 117 0 0 48 36 18 21 3 30.7 53 127 -9 48 24 25 48 48 14 48 21 34 48 51 5 -0.51 118 0 0 48 39 53 21 3 33.3 53 128 -8 48 28 0 48 51 48 48 25 9 48 54 39 -0.51 119 0 0 48 43 10 21 3 36.0 54 130 -8 48 31 17 48 55 4 48 28 26 48 57 55 -0.51 120 0 0 48 46 8 21 3 38.7 54 131 -7 48 34 16 48 58 2 48 31 26 49 0 53 -0.51 121 0 0 48 48 49 21 3 41.4 55 133 -6 48 36 57 49 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Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 1342-00333-1 * constellation : Gemini * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 06 42 32.7455 DE: +20 59 48.072 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 06 42 32.7455 DE: +20 59 48.072 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 9.3 * B mag [mag]: 10.4 * Diameter [mas]: 0.30 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (495) Eulalia asteroid class: approx. diameter [km]: 39 approx. diameter ["]: 0.024 distance from Earth [AU]: 2.25730 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#90 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): 0.019", 0.003", 94.732° remarks: * orbital elements for (495)Eulalia : Mean anomaly = 30.9449563589 deg Arg. of pericenter = 207.8483186151 deg Long. of node = 186.3887383949 deg Inclination = 2.2788225068 deg Eccentricity = 0.1299078387 Semimajor axis = 2.4880066125 AU Perihelion dist = 2.1647950509 AU Mag: H = 11.10, G = 0.15 Epoch of elements : MJD 60570.87859179 TDT (2024 Sep 17.8786) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#902023Apr24,1.55,2024,9,17,21.086206,0.052897,0.447411,14.175151,-1.663946,-0.005188,0.000346,0.000000,0.000000 147.4235,20.9739,-137.75,1.80,False TYC 1342-00333-1,6.70909593,20.9966867,10.44,9.33,8.73,0.3,0,,6.73353879,20.9738516,6.46,6.61,0,0,0 495,Eulalia,15.78,39.143,2.2573,0,0,3.943,-6.48,,2.0,0 0,30.7243,2024,9,17,207.8483,186.3887,2.2788,0.12991,2.48801,2.16480,11.10,5.0,0.15 1.120,0.0187,0.0028,95,0.0029,Known errors,1.15,0,-1,-1 20240917_0333-1,60140.57 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org