IOTA/IOTA-ES occultation update for (2420) Ciurlionis / TYC 5242-00245-1 event on 2024 Dec 12, 22:06 UT Visible from Summary ------- On 2024 Dec 12 UT, the 8.426299707687 km diameter asteroid (2420) Ciurlionis will occult a 8.9 mag star in the constellation Pisces for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 8.11 mag to 17.03 mag (the magnitude of the asteroid) for at most 0.390 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 Dec 12, 22:01 - 2024 Dec 12, 22:11 * geocentric midpoint of event [JD]: 2460657.42106534 * magnitude of target star: 8.92 * magnitude drop [mag]: 8.11 * estimated maximum duration [s]: 0.390 * Moon: 92 % sunlit, 62° distance * Sun: 85° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 9 * 1 sigma uncertainty interval [path widths]: +/- 0.32 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.002", 84°) * approx speed of asteroid's shadow [km/s]: 21.7519 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5242-00245-1 by 2420 Ciurlionis on 2024 Dec 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 -157 0 0 -24 52 3 22 1 43.7 1 92 85 -24 54 31 -24 49 35 -24 56 5 -24 48 1 .... -156 0 0 -24 53 59 22 1 43.8 2 91 85 -24 56 27 -24 51 31 -24 58 1 -24 49 57 0.26 -155 0 0 -24 55 49 22 1 44.0 2 91 86 -24 58 17 -24 53 21 -24 59 51 -24 51 47 0.29 -154 0 0 -24 57 33 22 1 44.2 3 91 87 -25 0 2 -24 55 5 -25 1 35 -24 53 32 0.31 -153 0 0 -24 59 12 22 1 44.6 4 90 87 -25 1 40 -24 56 44 -25 3 14 -24 55 11 0.32 -152 0 0 -25 0 45 22 1 45.0 5 90 87 -25 3 13 -24 58 17 -25 4 47 -24 56 44 0.32 -151 0 0 -25 2 13 22 1 45.4 6 89 87 -25 4 41 -24 59 45 -25 6 14 -24 58 11 0.33 -150 0 0 -25 3 34 22 1 46.0 7 89 87 -25 6 2 -25 1 6 -25 7 36 -24 59 33 0.33 -149 0 0 -25 4 50 22 1 46.6 8 88 86 -25 7 18 -25 2 22 -25 8 52 -25 0 48 0.33 -148 0 0 -25 6 0 22 1 47.4 9 88 86 -25 8 28 -25 3 32 -25 10 1 -25 1 58 0.34 -147 0 0 -25 7 4 22 1 48.2 10 88 85 -25 9 32 -25 4 36 -25 11 6 -25 3 2 0.34 -146 0 0 -25 8 2 22 1 49.0 11 87 84 -25 10 30 -25 5 34 -25 12 4 -25 4 1 0.34 -145 0 0 -25 8 54 22 1 50.0 12 87 83 -25 11 22 -25 6 26 -25 12 56 -25 4 53 0.34 -144 0 0 -25 9 41 22 1 51.0 12 86 82 -25 12 9 -25 7 13 -25 13 42 -25 5 39 0.34 -143 0 0 -25 10 21 22 1 52.1 13 86 81 -25 12 49 -25 7 53 -25 14 23 -25 6 20 0.34 -142 0 0 -25 10 56 22 1 53.3 14 85 81 -25 13 24 -25 8 28 -25 14 57 -25 6 54 0.34 -141 0 0 -25 11 24 22 1 54.5 15 85 80 -25 13 52 -25 8 56 -25 15 26 -25 7 23 0.34 -140 0 0 -25 11 47 22 1 55.9 16 85 79 -25 14 15 -25 9 19 -25 15 49 -25 7 46 0.34 -139 0 0 -25 12 4 22 1 57.3 17 84 78 -25 14 32 -25 9 36 -25 16 5 -25 8 2 0.34 -138 0 0 -25 12 14 22 1 58.8 18 84 77 -25 14 42 -25 9 46 -25 16 16 -25 8 13 0.34 -137 0 0 -25 12 19 22 2 0.3 19 83 76 -25 14 47 -25 9 51 -25 16 20 -25 8 17 0.35 -136 0 0 -25 12 18 22 2 2.0 20 83 75 -25 14 46 -25 9 50 -25 16 19 -25 8 16 0.35 -135 0 0 -25 12 10 22 2 3.7 21 82 74 -25 14 38 -25 9 42 -25 16 12 -25 8 9 0.35 -134 0 0 -25 11 57 22 2 5.4 21 82 73 -25 14 25 -25 9 29 -25 15 58 -25 7 55 0.35 -133 0 0 -25 11 37 22 2 7.3 22 81 72 -25 14 5 -25 9 9 -25 15 39 -25 7 36 0.35 -132 0 0 -25 11 12 22 2 9.2 23 81 72 -25 13 40 -25 8 44 -25 15 13 -25 7 10 0.35 -131 0 0 -25 10 40 22 2 11.2 24 80 71 -25 13 8 -25 8 12 -25 14 42 -25 6 39 0.35 -130 0 0 -25 10 3 22 2 13.3 25 80 70 -25 12 31 -25 7 35 -25 14 4 -25 6 1 0.35 -129 0 0 -25 9 19 22 2 15.4 26 79 69 -25 11 47 -25 6 51 -25 13 21 -25 5 18 0.35 -128 0 0 -25 8 30 22 2 17.6 27 79 68 -25 10 58 -25 6 2 -25 12 31 -25 4 28 0.35 -127 0 0 -25 7 34 22 2 19.9 28 78 67 -25 10 2 -25 5 6 -25 11 36 -25 3 33 0.35 -126 0 0 -25 6 33 22 2 22.3 29 78 66 -25 9 1 -25 4 5 -25 10 34 -25 2 31 0.35 -125 0 0 -25 5 25 22 2 24.7 30 77 65 -25 7 54 -25 2 57 -25 9 27 -25 1 24 0.35 -124 0 0 -25 4 12 22 2 27.2 30 77 64 -25 6 40 -25 1 44 -25 8 14 -25 0 11 0.35 -123 0 0 -25 2 53 22 2 29.7 31 76 63 -25 5 21 -25 0 25 -25 6 54 -24 58 51 0.35 -122 0 0 -25 1 27 22 2 32.4 32 76 62 -25 3 55 -24 58 59 -25 5 29 -24 57 26 0.35 -121 0 0 -24 59 56 22 2 35.1 33 75 62 -25 2 24 -24 57 28 -25 3 58 -24 55 55 0.35 -120 0 0 -24 58 19 22 2 37.8 34 74 61 -25 0 47 -24 55 51 -25 2 21 -24 54 17 0.35 -119 0 0 -24 56 36 22 2 40.7 35 74 60 -24 59 4 -24 54 8 -25 0 38 -24 52 34 0.35 -118 0 0 -24 54 47 22 2 43.5 36 73 59 -24 57 15 -24 52 19 -24 58 49 -24 50 46 0.35 -117 0 0 -24 52 52 22 2 46.5 37 73 58 -24 55 21 -24 50 24 -24 56 54 -24 48 51 0.35 -116 0 0 -24 50 52 22 2 49.5 38 72 57 -24 53 20 -24 48 24 -24 54 54 -24 46 50 0.35 -115 0 0 -24 48 46 22 2 52.6 39 71 56 -24 51 14 -24 46 18 -24 52 47 -24 44 44 0.35 -114 0 0 -24 46 34 22 2 55.7 39 71 55 -24 49 2 -24 44 6 -24 50 35 -24 42 32 0.35 -113 0 0 -24 44 16 22 2 58.9 40 70 54 -24 46 44 -24 41 48 -24 48 18 -24 40 14 0.35 -112 0 0 -24 41 53 22 3 2.2 41 70 53 -24 44 21 -24 39 24 -24 45 54 -24 37 51 0.35 -111 0 0 -24 39 24 22 3 5.5 42 69 52 -24 41 52 -24 36 55 -24 43 25 -24 35 22 0.35 -110 0 0 -24 36 49 22 3 8.9 43 68 51 -24 39 17 -24 34 21 -24 40 51 -24 32 47 0.35 -109 0 0 -24 34 9 22 3 12.4 44 67 51 -24 36 37 -24 31 41 -24 38 10 -24 30 7 0.35 -108 0 0 -24 31 23 22 3 15.9 45 67 50 -24 33 51 -24 28 55 -24 35 25 -24 27 21 0.35 -107 0 0 -24 28 32 22 3 19.4 46 66 49 -24 31 0 -24 26 3 -24 32 33 -24 24 30 0.35 -106 0 0 -24 25 35 22 3 23.0 46 65 48 -24 28 3 -24 23 7 -24 29 37 -24 21 33 0.35 -105 0 0 -24 22 33 22 3 26.7 47 64 47 -24 25 1 -24 20 5 -24 26 35 -24 18 31 0.35 -104 0 0 -24 19 25 22 3 30.4 48 64 46 -24 21 54 -24 16 57 -24 23 27 -24 15 24 0.35 -103 0 0 -24 16 13 22 3 34.2 49 63 45 -24 18 41 -24 13 44 -24 20 15 -24 12 11 0.35 -102 0 0 -24 12 55 22 3 38.0 50 62 44 -24 15 23 -24 10 26 -24 16 57 -24 8 53 0.35 -101 0 0 -24 9 31 22 3 41.9 51 61 43 -24 12 0 -24 7 3 -24 13 33 -24 5 30 0.35 -100 0 0 -24 6 3 22 3 45.8 51 60 42 -24 8 31 -24 3 35 -24 10 5 -24 2 1 0.35 - 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9 0 0 -16 0 14 22 10 16.1 29 277 -38 -16 2 42 -15 57 45 -16 4 16 -15 56 11 0.36 - 8 0 0 -15 55 34 22 10 18.7 28 277 -39 -15 58 3 -15 53 6 -15 59 37 -15 51 32 0.36 - 7 0 0 -15 50 59 22 10 21.1 27 276 -39 -15 53 28 -15 48 31 -15 55 2 -15 46 57 0.36 - 6 0 0 -15 46 29 22 10 23.5 26 276 -40 -15 48 57 -15 44 0 -15 50 31 -15 42 26 0.36 - 5 0 0 -15 42 2 22 10 25.9 26 275 -41 -15 44 31 -15 39 34 -15 46 5 -15 38 0 0.36 - 4 0 0 -15 37 40 22 10 28.1 25 275 -41 -15 40 9 -15 35 12 -15 41 43 -15 33 38 0.36 - 3 0 0 -15 33 23 22 10 30.3 24 275 -42 -15 35 52 -15 30 55 -15 37 26 -15 29 21 0.36 - 2 0 0 -15 29 11 22 10 32.3 23 274 -43 -15 31 39 -15 26 42 -15 33 13 -15 25 8 0.36 - 1 0 0 -15 25 3 22 10 34.3 22 274 -43 -15 27 31 -15 22 34 -15 29 5 -15 21 0 0.36 0 0 0 -15 21 0 22 10 36.3 21 274 -44 -15 23 28 -15 18 31 -15 25 2 -15 16 57 0.36 1 0 0 -15 17 1 22 10 38.1 20 273 -45 -15 19 30 -15 14 33 -15 21 4 -15 12 59 0.36 2 0 0 -15 13 8 22 10 39.8 19 273 -45 -15 15 37 -15 10 40 -15 17 11 -15 9 6 0.36 3 0 0 -15 9 20 22 10 41.5 18 273 -46 -15 11 49 -15 6 52 -15 13 22 -15 5 18 0.37 4 0 0 -15 5 37 22 10 43.1 17 273 -46 -15 8 5 -15 3 8 -15 9 39 -15 1 35 0.37 5 0 0 -15 1 59 22 10 44.6 16 272 -47 -15 4 27 -14 59 30 -15 6 1 -14 57 57 0.37 6 0 0 -14 58 26 22 10 46.0 15 272 -47 -15 0 55 -14 55 58 -15 2 28 -14 54 24 0.37 7 0 0 -14 54 59 22 10 47.3 14 272 -48 -14 57 27 -14 52 30 -14 59 1 -14 50 57 0.37 8 0 0 -14 51 37 22 10 48.5 13 271 -48 -14 54 5 -14 49 8 -14 55 39 -14 47 35 0.37 9 0 0 -14 48 20 22 10 49.6 12 271 -49 -14 50 48 -14 45 52 -14 52 22 -14 44 18 0.37 10 0 0 -14 45 9 22 10 50.7 11 271 -49 -14 47 37 -14 42 40 -14 49 11 -14 41 7 0.37 11 0 0 -14 42 3 22 10 51.7 10 271 -50 -14 44 31 -14 39 35 -14 46 5 -14 38 1 0.37 12 0 0 -14 39 3 22 10 52.5 9 270 -50 -14 41 31 -14 36 35 -14 43 5 -14 35 1 0.38 13 0 0 -14 36 8 22 10 53.3 8 270 -50 -14 38 37 -14 33 40 -14 40 10 -14 32 6 0.38 14 0 0 -14 33 20 22 10 54.0 7 270 -51 -14 35 48 -14 30 51 -14 37 22 -14 29 18 0.38 15 0 0 -14 30 36 22 10 54.7 6 270 -51 -14 33 5 -14 28 8 -14 34 39 -14 26 35 0.38 16 0 0 -14 27 59 22 10 55.2 5 269 -51 -14 30 28 -14 25 31 -14 32 1 -14 23 57 0.39 17 0 0 -14 25 28 22 10 55.6 4 269 -52 -14 27 56 -14 22 59 -14 29 30 -14 21 26 0.40 18 0 0 -14 23 2 22 10 56.0 3 269 -52 -14 25 31 -14 20 34 -14 27 4 -14 19 0 0.41 19 0 0 -14 20 43 22 10 56.2 2 269 -52 -14 23 11 -14 18 14 -14 24 45 -14 16 41 0.44 20 0 0 -14 18 29 22 10 56.4 1 268 -52 -14 20 57 -14 16 1 -14 22 31 -14 14 27 0.50 21 0 0 -14 16 21 22 10 56.5 0 268 -52 -14 18 49 -14 13 53 -14 20 23 -14 12 19 0.88 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 5242-00245-1 * constellation : Pisces * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 23 01 33.4804 DE: -02 04 16.962 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 23 01 33.4802 DE: -02 04 16.963 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 8.9 * B mag [mag]: 9.4 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2420) Ciurlionis asteroid class: approx. diameter [km]: 8 approx. diameter ["]: 0.005 distance from Earth [AU]: 2.13300 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#52 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): 0.015", 0.002", 83.854° remarks: * orbital elements for (2420)Ciurlionis : Mean anomaly = 334.2587613303 deg Arg. of pericenter = 198.9291918991 deg Long. of node = 205.5068498411 deg Inclination = 14.5948887381 deg Eccentricity = 0.1322452893 Semimajor axis = 2.5601197414 AU Perihelion dist = 2.2215559656 AU Mag: H = 12.44, G = 0.15 Epoch of elements : MJD 60656.92106537 TDT (2024 Dec 12.9211) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#522023Apr24,0.39,2024,12,12,22.105568,0.030618,-0.331363,12.225614,1.126408,0.005197,0.002214,0.000000,0.000000 -67.9682,-1.9375,-153.05,-23.16,False TYC 5242-00245-1,23.02596680,-2.0713781,9.42,8.92,8.65,0.1,0,,23.04729341,-1.9374904,8.11,7.93,0,0,0 2420,Ciurlionis,17.03,8.581,2.1330,0,0,3.363,4.65,,0.8,0 0,334.0371,2024,12,12,198.9292,205.5068,14.5949,0.13225,2.56012,2.22156,12.44,5.0,0.15 1.316,0.0147,0.0017,84,0.0018,Known errors,0.96,0,-1,-1 20241212_0245-1,60140.74 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org