IOTA/IOTA-ES occultation update for (3611) Dabu / TYC 1375-00993-1 event on 2024 Apr 09, 18:15 UT Visible from Summary ------- On 2024 Apr 09 UT, the 14.3512236849828 km diameter asteroid (3611) Dabu will occult a 10.2 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 7.75 mag to 17.99 mag (the magnitude of the asteroid) for at most 0.940 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: 93 * date and approx. time of event: 2024 Apr 09, 18:08 - 2024 Apr 09, 18:21 * geocentric midpoint of event [JD]: 2460410.26066620 * magnitude of target star: 10.24 * magnitude drop [mag]: 7.75 * estimated maximum duration [s]: 0.940 * Moon: 1 % sunlit, 84° distance * Sun: 97° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 15 * 1 sigma uncertainty interval [path widths]: +/- 0.48 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.004", 92°) * approx speed of asteroid's shadow [km/s]: 15.3634 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1375-00993-1 by 3611 Dabu on 2024 Apr 9 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 - 74 0 0 -16 40 3 18 8 50.9 1 67 60 -16 44 33 -16 35 32 -16 48 51 -16 31 14 .... - 73 0 0 -16 16 8 18 8 51.0 2 67 59 -16 20 38 -16 11 38 -16 24 56 -16 7 20 0.16 - 72 0 0 -15 52 16 18 8 51.4 3 67 59 -15 56 46 -15 47 46 -16 1 4 -15 43 29 0.23 - 71 0 0 -15 28 28 18 8 51.8 4 66 59 -15 32 58 -15 23 58 -15 37 16 -15 19 41 0.26 - 70 0 0 -15 4 44 18 8 52.4 5 66 58 -15 9 14 -15 0 14 -15 13 31 -14 55 57 0.28 - 69 0 0 -14 41 4 18 8 53.2 6 66 58 -14 45 34 -14 36 35 -14 49 51 -14 32 18 0.29 - 68 0 0 -14 17 31 18 8 54.1 7 66 58 -14 22 0 -14 13 1 -14 26 17 -14 8 44 0.30 - 67 0 0 -13 54 2 18 8 55.1 8 65 57 -13 58 32 -13 49 33 -14 2 49 -13 45 17 0.31 - 66 0 0 -13 30 41 18 8 56.3 9 65 57 -13 35 10 -13 26 12 -13 39 27 -13 21 56 0.31 - 65 0 0 -13 7 26 18 8 57.7 10 65 56 -13 11 55 -13 2 58 -13 16 12 -12 58 42 0.32 - 64 0 0 -12 44 20 18 8 59.1 11 65 55 -12 48 48 -12 39 51 -12 53 4 -12 35 35 0.32 - 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9 59 53 -10 13 0 - 9 55 39 0.35 63 0 0 -10 26 20 18 21 10.4 25 300 -68 -10 30 47 -10 21 53 -10 35 2 -10 17 39 0.35 64 0 0 -10 48 33 18 21 13.8 24 300 -69 -10 53 0 -10 44 6 -10 57 15 -10 39 51 0.35 65 0 0 -11 10 57 18 21 17.0 23 299 -70 -11 15 25 -11 6 30 -11 19 40 -11 2 15 0.35 66 0 0 -11 33 32 18 21 20.1 22 299 -71 -11 38 0 -11 29 4 -11 42 15 -11 24 49 0.35 67 0 0 -11 56 17 18 21 23.1 21 299 -72 -12 0 45 -11 51 49 -12 5 1 -11 47 33 0.35 68 0 0 -12 19 12 18 21 26.0 20 298 -73 -12 23 40 -12 14 43 -12 27 56 -12 10 28 0.35 69 0 0 -12 42 15 18 21 28.6 19 298 -74 -12 46 44 -12 37 47 -12 51 1 -12 33 31 0.35 70 0 0 -13 5 28 18 21 31.2 18 298 -74 -13 9 57 -13 0 59 -13 14 13 -12 56 43 0.35 71 0 0 -13 28 48 18 21 33.6 17 298 -75 -13 33 17 -13 24 19 -13 37 34 -13 20 2 0.35 72 0 0 -13 52 15 18 21 35.9 16 297 -76 -13 56 44 -13 47 46 -14 1 1 -13 43 29 0.35 73 0 0 -14 15 49 18 21 38.0 15 297 -77 -14 20 18 -14 11 19 -14 24 36 -14 7 2 0.35 74 0 0 -14 39 29 18 21 39.9 14 297 -77 -14 43 59 -14 34 59 -14 48 16 -14 30 42 0.35 75 0 0 -15 3 14 18 21 41.8 13 297 -78 -15 7 44 -14 58 44 -15 12 2 -14 54 27 0.35 76 0 0 -15 27 4 18 21 43.4 11 296 -79 -15 31 34 -15 22 34 -15 35 52 -15 18 16 0.35 77 0 0 -15 50 58 18 21 45.0 10 296 -79 -15 55 29 -15 46 28 -15 59 47 -15 42 10 0.35 78 0 0 -16 14 56 18 21 46.3 9 296 -79 -16 19 27 -16 10 26 -16 23 45 -16 6 8 0.35 79 0 0 -16 38 57 18 21 47.6 8 295 -80 -16 43 28 -16 34 26 -16 47 46 -16 30 9 0.35 80 0 0 -17 3 0 18 21 48.7 7 295 -80 -17 7 31 -16 58 29 -17 11 49 -16 54 11 0.35 81 0 0 -17 27 5 18 21 49.6 6 295 -80 -17 31 36 -17 22 34 -17 35 55 -17 18 16 0.35 82 0 0 -17 51 11 18 21 50.4 5 295 -80 -17 55 42 -17 46 40 -18 0 1 -17 42 22 0.35 83 0 0 -18 15 17 18 21 51.0 4 294 -80 -18 19 49 -18 10 46 -18 24 7 -18 6 28 0.35 84 0 0 -18 39 24 18 21 51.5 3 294 -79 -18 43 55 -18 34 53 -18 48 14 -18 30 34 0.36 85 0 0 -19 3 29 18 21 51.9 2 294 -79 -19 8 1 -18 58 58 -19 12 20 -18 54 40 0.36 86 0 0 -19 27 34 18 21 52.1 1 293 -78 -19 32 5 -19 23 2 -19 36 24 -19 18 44 0.38 87 0 0 -19 51 36 18 21 52.2 0 293 -78 -19 56 7 -19 47 5 -20 0 26 -19 42 46 0.74 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 14.3 Data for the target star ------------------------ * name: TYC 1375-00993-1 * constellation : Gemini * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 07 55 15.2116 DE: +21 33 45.038 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 07 55 15.2115 DE: +21 33 45.039 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.2 * B mag [mag]: 10.8 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3611) Dabu asteroid class: approx. diameter [km]: 14 approx. diameter ["]: 0.009 distance from Earth [AU]: 2.18920 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#50 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): 0.018", 0.004", 92.5° remarks: * orbital elements for (3611)Dabu : Mean anomaly = 51.4985274255 deg Arg. of pericenter = 290.5119167355 deg Long. of node = 135.6189233792 deg Inclination = 8.4885524343 deg Eccentricity = 0.2141976870 Semimajor axis = 2.7866156060 AU Perihelion dist = 2.1897289886 AU Mag: H = 13.19, G = 0.15 Epoch of elements : MJD 60409.76066633 TDT (2024 Apr 09.7607) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#502023Apr27,0.94,2024,4,9,18.255989,-0.009397,-0.337225,8.668200,-0.240938,0.005513,-0.001099,0.000000,0.000000 6.8507,21.4995,-93.49,7.96,False TYC 1375-00993-1,7.92089213,21.5625106,10.79,10.24,9.94,0.1,0,,7.94471295,21.4994875,7.75,7.60,0,0,0 3611,Dabu,17.99,14.510,2.1892,0,0,2.495,-0.97,,1.2,0 0,51.3374,2024,4,9,290.5119,135.6189,8.4886,0.21420,2.78662,2.18973,13.19,5.0,0.15 1.477,0.0180,0.0043,92,0.0043,Known errors,1.07,0,-1,-1 20240409_0993-1,60139.28 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 06:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org