IOTA/IOTA-ES occultation update for (339) Dorothea / TYC 42-00499-1 event on 2024 Jan 29, 19:20 UT Visible from Summary ------- On 2024 Jan 29 UT, the 44.878 km diameter asteroid (339) Dorothea will occult a 10.5 mag star in the constellation Cetus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.52 mag to 15.03 mag (the magnitude of the asteroid) for at most 2.460 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: 98 * date and approx. time of event: 2024 Jan 29, 19:15 - 2024 Jan 29, 19:25 * geocentric midpoint of event [JD]: 2460339.30580758 * magnitude of target star: 10.53 * magnitude drop [mag]: 4.52 * estimated maximum duration [s]: 2.460 * Moon: 85 % sunlit, 137° distance * Sun: 88° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 56 * 1 sigma uncertainty interval [path widths]: +/- 0.36 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.020, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.020", 0.005", 81°) * approx speed of asteroid's shadow [km/s]: 18.2181 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 42-00499-1 by 339 Dorothea on 2024 Jan 29 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 -110 0 0 10 15 32 19 15 41.3 1 85 62 10 0 15 10 30 52 9 49 21 10 41 52 .... -109 0 0 10 21 34 19 15 41.4 2 85 62 10 6 16 10 36 55 9 55 21 10 47 56 -0.56 -108 0 0 10 28 12 19 15 41.7 3 85 62 10 12 53 10 43 34 10 1 57 10 54 36 -0.63 -107 0 0 10 35 25 19 15 42.2 4 86 62 10 20 4 10 50 48 10 9 8 11 1 51 -0.66 -106 0 0 10 43 13 19 15 42.7 5 86 61 10 27 52 10 58 38 10 16 54 11 9 42 -0.68 -105 0 0 10 51 37 19 15 43.4 6 86 61 10 36 14 11 7 3 10 25 15 11 18 8 -0.70 -104 0 0 11 0 37 19 15 44.2 7 86 61 10 45 12 11 16 4 10 34 12 11 27 10 -0.71 -103 0 0 11 10 12 19 15 45.2 8 86 61 10 54 46 11 25 41 10 43 45 11 36 48 -0.71 -102 0 0 11 20 22 19 15 46.3 9 87 61 11 4 55 11 35 53 10 53 53 11 47 2 -0.72 -101 0 0 11 31 9 19 15 47.5 10 87 60 11 15 39 11 46 41 11 4 36 11 57 51 -0.72 -100 0 0 11 42 30 19 15 48.8 11 87 60 11 26 59 11 58 5 11 15 54 12 9 16 -0.73 - 99 0 0 11 54 27 19 15 50.3 12 87 60 11 38 54 12 10 4 11 27 48 12 21 16 -0.73 - 98 0 0 12 6 59 19 15 51.9 13 87 59 11 51 24 12 22 38 11 40 16 12 33 52 -0.73 - 97 0 0 12 20 7 19 15 53.7 14 88 59 12 4 29 12 35 47 11 53 20 12 47 3 -0.73 - 96 0 0 12 33 49 19 15 55.6 15 88 58 12 18 10 12 49 32 12 6 59 13 0 49 -0.74 - 95 0 0 12 48 7 19 15 57.6 16 88 58 12 32 25 13 3 53 12 21 13 13 15 11 -0.74 - 94 0 0 13 3 0 19 15 59.7 17 89 57 12 47 16 13 18 48 12 36 2 13 30 8 -0.74 - 93 0 0 13 18 28 19 16 2.0 18 89 56 13 2 41 13 34 18 12 51 25 13 45 40 -0.74 - 92 0 0 13 34 30 19 16 4.4 19 89 56 13 18 41 13 50 23 13 7 24 14 1 47 -0.74 - 91 0 0 13 51 8 19 16 7.0 20 90 55 13 35 16 14 7 3 13 23 56 14 18 29 -0.74 - 90 0 0 14 8 19 19 16 9.6 21 90 54 13 52 25 14 24 17 13 41 3 14 35 45 -0.74 - 89 0 0 14 26 5 19 16 12.4 22 90 54 14 10 8 14 42 6 13 58 45 14 53 36 -0.74 - 88 0 0 14 44 25 19 16 15.4 22 91 53 14 28 25 15 0 29 14 17 0 15 12 1 -0.75 - 87 0 0 15 3 19 19 16 18.4 23 91 52 14 47 16 15 19 26 14 35 49 15 31 0 -0.75 - 86 0 0 15 22 47 19 16 21.6 24 91 51 15 6 41 15 38 57 14 55 12 15 50 33 -0.75 - 85 0 0 15 42 48 19 16 25.0 25 92 51 15 26 39 15 59 1 15 15 8 16 10 39 -0.75 - 84 0 0 16 3 23 19 16 28.4 26 92 50 15 47 10 16 19 38 15 35 37 16 31 19 -0.75 - 83 0 0 16 24 30 19 16 32.0 27 93 49 16 8 15 16 40 49 15 56 39 16 52 32 -0.75 - 82 0 0 16 46 10 19 16 35.7 28 93 48 16 29 51 17 2 32 16 18 13 17 14 17 -0.75 - 81 0 0 17 8 22 19 16 39.5 29 94 47 16 52 0 17 24 47 16 40 19 17 36 35 -0.75 - 80 0 0 17 31 6 19 16 43.4 30 94 46 17 14 41 17 47 35 17 2 58 17 59 25 -0.75 - 79 0 0 17 54 21 19 16 47.5 31 95 46 17 37 53 18 10 54 17 26 7 18 22 46 -0.75 - 78 0 0 18 18 8 19 16 51.7 32 96 45 18 1 36 18 34 44 17 49 48 18 46 39 -0.75 - 77 0 0 18 42 25 19 16 56.0 33 96 44 18 25 49 18 59 4 18 13 59 19 11 2 -0.75 - 76 0 0 19 7 12 19 17 0.4 34 97 43 18 50 33 19 23 55 18 38 40 19 35 55 -0.75 - 75 0 0 19 32 29 19 17 4.9 35 98 42 19 15 46 19 49 15 19 3 51 20 1 18 -0.75 - 74 0 0 19 58 15 19 17 9.5 36 98 41 19 41 28 20 15 5 19 29 31 20 27 11 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Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 12.0 Data for the target star ------------------------ * name: TYC 42-00499-1 * constellation : Cetus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 02 29 17.7851 DE: +04 54 54.307 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 02 29 17.7849 DE: +04 54 54.306 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.5 * B mag [mag]: 10.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (339) Dorothea asteroid class: approx. diameter [km]: 45 approx. diameter ["]: 0.022 distance from Earth [AU]: 2.79870 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#58 date of fit: 2023 Apr 27 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): 0.020", 0.005", 80.76° remarks: * orbital elements for (339)Dorothea : Mean anomaly = 67.7163519776 deg Arg. of pericenter = 164.5380611039 deg Long. of node = 173.4344184330 deg Inclination = 9.9546189303 deg Eccentricity = 0.1007803004 Semimajor axis = 3.0151692118 AU Perihelion dist = 2.7112995528 AU Mag: H = 9.47, G = 0.15 Epoch of elements : MJD 60338.80580688 TDT (2024 Jan 29.8058) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#582023Apr27,2.46,2024,1,29,19.339382,-0.267960,0.535594,9.192028,4.608937,0.005649,0.001862,0.000000,0.000000 -20.9962,5.0216,-106.82,-17.91,False TYC 42-00499-1,2.48827365,4.9150854,10.81,10.53,10.38,0.0,0,,2.50923568,5.0215936,4.51,4.22,0,0,0 339,Dorothea,15.03,44.878,2.7987,0,0,1.933,14.48,,2.2,0 0,67.5647,2024,1,29,164.5381,173.4344,9.9546,0.10078,3.01517,2.71130,9.47,5.0,0.15 1.358,0.0203,0.0053,81,0.0079,Known errors,1.31,0,-1,-1 20240129_0499-1,60137.04 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 12, 00:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org