IOTA/IOTA-ES occultation update for (2326) Tololo / UCAC4 483-038344 event on 2024 Oct 13, 07:50 UT Visible from Summary ------- On 2024 Oct 13 UT, the 42.05 km diameter asteroid (2326) Tololo will occult a 11.7 mag star in the constellation Canis Minor for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.11 mag to 15.83 mag (the magnitude of the asteroid) for at most 2.270 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 Oct 13, 07:44 - 2024 Oct 13, 07:56 * geocentric midpoint of event [JD]: 2460596.82673062 * magnitude of target star: 11.74 * magnitude drop [mag]: 4.11 * estimated maximum duration [s]: 2.270 * Moon: 77 % sunlit, 145° distance * Sun: 88° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 42 * 1 sigma uncertainty interval [path widths]: +/- 0.33 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.019, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.001", 85°) * approx speed of asteroid's shadow [km/s]: 18.5500 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 483-038344 by 2326 Tololo on 2024 Oct 13 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 -118 0 0 19 1 20 7 44 45.9 1 83 -79 18 49 52 19 12 49 18 42 24 19 20 17 .... -117 0 0 19 7 49 7 44 46.0 2 84 -79 18 56 21 19 19 18 18 48 54 19 26 45 -0.01 -116 0 0 19 13 57 7 44 46.2 3 84 -78 19 2 30 19 25 25 18 55 2 19 32 52 0.00 -115 0 0 19 19 44 7 44 46.5 4 84 -78 19 8 17 19 31 11 19 0 50 19 38 38 0.01 -114 0 0 19 25 9 7 44 46.9 4 85 -77 19 13 43 19 36 36 19 6 16 19 44 3 0.01 -113 0 0 19 30 14 7 44 47.4 5 85 -77 19 18 47 19 41 40 19 11 21 19 49 6 0.01 -112 0 0 19 34 56 7 44 48.0 6 85 -76 19 23 30 19 46 23 19 16 4 19 53 49 0.01 -111 0 0 19 39 18 7 44 48.7 7 86 -76 19 27 52 19 50 44 19 20 26 19 58 10 0.02 -110 0 0 19 43 18 7 44 49.4 8 86 -75 19 31 53 19 54 43 19 24 27 20 2 9 0.02 -109 0 0 19 46 57 7 44 50.3 9 86 -74 19 35 31 19 58 22 19 28 6 20 5 47 0.02 -108 0 0 19 50 14 7 44 51.2 10 87 -74 19 38 49 20 1 38 19 31 23 20 9 4 0.02 -107 0 0 19 53 9 7 44 52.3 11 87 -73 19 41 44 20 4 34 19 34 19 20 11 59 0.02 -106 0 0 19 55 43 7 44 53.4 12 87 -72 19 44 18 20 7 7 19 36 53 20 14 32 0.02 -105 0 0 19 57 55 7 44 54.7 13 88 -71 19 46 31 20 9 19 19 39 6 20 16 44 0.02 -104 0 0 19 59 46 7 44 56.0 14 88 -71 19 48 22 20 11 10 19 40 57 20 18 35 0.02 -103 0 0 20 1 15 7 44 57.4 15 88 -70 19 49 51 20 12 39 19 42 26 20 20 3 0.02 -102 0 0 20 2 22 7 44 58.9 16 89 -69 19 50 58 20 13 46 19 43 33 20 21 10 0.02 -101 0 0 20 3 7 7 45 0.5 17 89 -68 19 51 43 20 14 31 19 44 18 20 21 56 0.02 -100 0 0 20 3 31 7 45 2.2 18 89 -67 19 52 7 20 14 55 19 44 42 20 22 19 0.02 - 99 0 0 20 3 33 7 45 4.0 19 90 -67 19 52 9 20 14 56 19 44 44 20 22 21 0.02 - 98 0 0 20 3 13 7 45 5.8 20 90 -66 19 51 49 20 14 36 19 44 24 20 22 1 0.02 - 97 0 0 20 2 31 7 45 7.8 21 90 -65 19 51 7 20 13 55 19 43 42 20 21 19 0.02 - 96 0 0 20 1 27 7 45 9.8 22 91 -64 19 50 3 20 12 51 19 42 38 20 20 16 0.02 - 95 0 0 20 0 1 7 45 12.0 22 91 -63 19 48 37 20 11 25 19 41 12 20 18 50 0.02 - 94 0 0 19 58 14 7 45 14.2 23 91 -62 19 46 49 20 9 38 19 39 24 20 17 3 0.02 - 93 0 0 19 56 4 7 45 16.5 24 92 -61 19 44 40 20 7 28 19 37 14 20 14 54 0.02 - 92 0 0 19 53 33 7 45 18.9 25 92 -61 19 42 8 20 4 57 19 34 43 20 12 22 0.02 - 91 0 0 19 50 39 7 45 21.4 26 92 -60 19 39 14 20 2 4 19 31 49 20 9 29 0.02 - 90 0 0 19 47 24 7 45 23.9 27 93 -59 19 35 58 19 58 49 19 28 33 20 6 14 0.02 - 89 0 0 19 43 46 7 45 26.6 28 93 -58 19 32 21 19 55 12 19 24 55 20 2 37 0.02 - 88 0 0 19 39 47 7 45 29.4 29 93 -57 19 28 21 19 51 13 19 20 55 19 58 39 0.02 - 87 0 0 19 35 25 7 45 32.2 30 94 -56 19 23 59 19 46 52 19 16 33 19 54 18 0.02 - 86 0 0 19 30 42 7 45 35.1 31 94 -55 19 19 16 19 42 9 19 11 49 19 49 35 0.02 - 85 0 0 19 25 37 7 45 38.1 32 94 -54 19 14 10 19 37 4 19 6 43 19 44 30 0.02 - 84 0 0 19 20 9 7 45 41.2 33 95 -53 19 8 42 19 31 37 19 1 15 19 39 4 0.03 - 83 0 0 19 14 20 7 45 44.4 34 95 -53 19 2 52 19 25 48 18 55 25 19 33 15 0.03 - 82 0 0 19 8 9 7 45 47.7 35 95 -52 18 56 40 19 19 37 18 49 13 19 27 4 0.03 - 81 0 0 19 1 35 7 45 51.0 36 96 -51 18 50 7 19 13 4 18 42 39 19 20 32 0.03 - 80 0 0 18 54 40 7 45 54.5 37 96 -50 18 43 11 19 6 9 18 35 43 19 13 38 0.03 - 79 0 0 18 47 23 7 45 58.0 38 96 -49 18 35 53 18 58 53 18 28 24 19 6 21 0.03 - 78 0 0 18 39 44 7 46 1.6 39 97 -48 18 28 14 18 51 14 18 20 44 18 58 43 0.03 - 77 0 0 18 31 43 7 46 5.3 40 97 -47 18 20 12 18 43 14 18 12 42 18 50 43 0.03 - 76 0 0 18 23 20 7 46 9.0 41 97 -46 18 11 49 18 34 52 18 4 19 18 42 22 0.03 - 75 0 0 18 14 36 7 46 12.9 42 98 -45 18 3 3 18 26 8 17 55 33 18 33 38 0.03 - 74 0 0 18 5 29 7 46 16.8 43 98 -44 17 53 56 18 17 2 17 46 25 18 24 33 0.03 - 73 0 0 17 56 1 7 46 20.9 44 98 -43 17 44 27 18 7 35 17 36 56 18 15 6 0.03 - 72 0 0 17 46 11 7 46 25.0 45 98 -42 17 34 37 17 57 46 17 27 5 18 5 17 0.03 - 71 0 0 17 36 0 7 46 29.1 46 99 -41 17 24 25 17 47 35 17 16 53 17 55 7 0.03 - 70 0 0 17 25 27 7 46 33.4 47 99 -40 17 13 51 17 37 3 17 6 18 17 44 35 0.03 - 69 0 0 17 14 32 7 46 37.8 48 99 -39 17 2 56 17 26 9 16 55 23 17 33 42 0.03 - 68 0 0 17 3 17 7 46 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8 31 -17 39 43 -17 0 52 0.01 36 0 0 -17 34 56 7 55 49.7 21 284 67 -17 46 41 -17 23 10 -17 54 20 -17 15 32 0.01 37 0 0 -17 49 14 7 55 51.8 20 284 68 -18 0 59 -17 37 30 -18 8 37 -17 29 52 0.01 38 0 0 -18 3 13 7 55 53.8 19 284 68 -18 14 56 -17 51 29 -18 22 34 -17 43 52 0.01 39 0 0 -18 16 52 7 55 55.7 18 284 69 -18 28 34 -18 5 9 -18 36 11 -17 57 32 0.01 40 0 0 -18 30 11 7 55 57.5 17 283 70 -18 41 52 -18 18 29 -18 49 29 -18 10 52 0.01 41 0 0 -18 43 9 7 55 59.2 16 283 71 -18 54 50 -18 31 28 -19 2 26 -18 23 53 0.01 42 0 0 -18 55 48 7 56 0.8 15 283 71 -19 7 28 -18 44 8 -19 15 3 -18 36 32 0.01 43 0 0 -19 8 6 7 56 2.3 14 282 72 -19 19 45 -18 56 27 -19 27 20 -18 48 52 0.01 44 0 0 -19 20 4 7 56 3.7 13 282 73 -19 31 42 -19 8 25 -19 39 16 -19 0 51 0.01 45 0 0 -19 31 41 7 56 5.0 12 282 73 -19 43 19 -19 20 3 -19 50 52 -19 12 30 0.01 46 0 0 -19 42 58 7 56 6.2 11 281 74 -19 54 35 -19 31 21 -20 2 8 -19 23 48 0.01 47 0 0 -19 53 54 7 56 7.3 11 281 74 -20 5 30 -19 42 18 -20 13 3 -19 34 45 0.01 48 0 0 -20 4 29 7 56 8.3 10 281 75 -20 16 5 -19 52 54 -20 23 37 -19 45 22 0.01 49 0 0 -20 14 44 7 56 9.2 9 280 75 -20 26 19 -20 3 10 -20 33 50 -19 55 38 0.01 50 0 0 -20 24 38 7 56 10.0 8 280 76 -20 36 12 -20 13 4 -20 43 43 -20 5 33 0.01 51 0 0 -20 34 11 7 56 10.7 7 280 76 -20 45 44 -20 22 38 -20 53 15 -20 15 7 0.01 52 0 0 -20 43 24 7 56 11.3 6 279 76 -20 54 56 -20 31 51 -21 2 27 -20 24 21 0.01 53 0 0 -20 52 15 7 56 11.9 5 279 76 -21 3 47 -20 40 43 -21 11 17 -20 33 13 0.01 54 0 0 -21 0 46 7 56 12.3 4 278 77 -21 12 17 -20 49 14 -21 19 46 -20 41 45 0.01 55 0 0 -21 8 55 7 56 12.6 3 278 77 -21 20 26 -20 57 25 -21 27 55 -20 49 55 0.00 56 0 0 -21 16 44 7 56 12.9 2 278 77 -21 28 14 -21 5 14 -21 35 43 -20 57 45 0.00 57 0 0 -21 24 11 7 56 13.0 1 277 77 -21 35 41 -21 12 42 -21 43 9 -21 5 14 -0.02 58 0 0 -21 31 18 7 56 13.1 0 277 76 -21 42 47 -21 19 49 -21 50 15 -21 12 21 -0.39 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 483-038344 * constellation : Canis Minor * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 07 27 01.3752 DE: +06 34 24.453 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 07 27 01.3752 DE: +06 34 24.453 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.7 * B mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2326) Tololo asteroid class: approx. diameter [km]: 42 approx. diameter ["]: 0.025 distance from Earth [AU]: 2.28140 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#59 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", 0.001", 85.091° remarks: * orbital elements for (2326)Tololo : Mean anomaly = 23.2283208714 deg Arg. of pericenter = 259.1866845588 deg Long. of node = 155.7552782515 deg Inclination = 15.1442762227 deg Eccentricity = 0.1601183028 Semimajor axis = 2.8608247402 AU Perihelion dist = 2.4027543382 AU Mag: H = 10.98, G = 0.15 Epoch of elements : MJD 60596.32672979 TDT (2024 Oct 13.3267) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#592023Apr24,2.27,2024,10,13,7.841535,-0.007611,-0.021309,9.822999,-3.623883,-0.005564,0.000823,0.000000,0.000000 -27.9047,6.5260,58.92,-8.00,False UCAC4 483-038344,7.45038196,6.5734592,12.21,11.74,11.49,0.0,0,,7.47249966,6.5260021,4.12,3.93,0,0,0 2326,Tololo,15.83,42.050,2.2814,0,0,2.541,-13.97,,1.8,0 0,23.1618,2024,10,13,259.1867,155.7553,15.1443,0.16012,2.86082,2.40275,10.97,5.0,0.15 1.325,0.0193,0.0010,85,0.0083,Known errors,0.81,0,-1,-1 20241013_038344,60140.63 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org