IOTA/IOTA-ES occultation update for (7808) Bagould / TYC 4937-00881-1 event on 2024 Dec 17, 05:46 UT Visible from Summary ------- On 2024 Dec 17 UT, the 8.02118182709824 km diameter asteroid (7808) Bagould will occult a 9.5 mag star in the constellation Virgo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 8.44 mag to 17.95 mag (the magnitude of the asteroid) for at most 0.410 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: 74 * date and approx. time of event: 2024 Dec 17, 05:41 - 2024 Dec 17, 05:52 * geocentric midpoint of event [JD]: 2460661.74071558 * magnitude of target star: 9.51 * magnitude drop [mag]: 8.44 * estimated maximum duration [s]: 0.410 * Moon: 96 % sunlit, 71° distance * Sun: 86° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 8 * 1 sigma uncertainty interval [path widths]: +/- 0.76 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.003", 114°) * approx speed of asteroid's shadow [km/s]: 19.8385 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4937-00881-1 by 7808 Bagould on 2024 Dec 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 - 79 0 0 42 13 8 5 41 21.0 0 98 -70 42 10 53 42 15 24 42 7 23 42 18 53 .... - 78 0 0 42 6 49 5 41 21.1 1 98 -70 42 4 33 42 9 5 42 1 4 42 12 35 -0.05 - 77 0 0 42 0 3 5 41 21.2 2 99 -70 41 57 47 42 2 19 41 54 17 42 5 49 -0.09 - 76 0 0 41 52 49 5 41 21.3 3 100 -70 41 50 33 41 55 6 41 47 3 41 58 36 -0.11 - 75 0 0 41 45 9 5 41 21.5 3 100 -69 41 42 52 41 47 25 41 39 21 41 50 56 -0.12 - 74 0 0 41 37 0 5 41 21.8 4 101 -69 41 34 43 41 39 17 41 31 12 41 42 48 -0.12 - 73 0 0 41 28 24 5 41 22.2 5 102 -69 41 26 7 41 30 41 41 22 36 41 34 12 -0.13 - 72 0 0 41 19 20 5 41 22.6 6 102 -68 41 17 2 41 21 37 41 13 31 41 25 9 -0.13 - 71 0 0 41 9 47 5 41 23.0 6 103 -68 41 7 30 41 12 5 41 3 58 41 15 37 -0.13 - 70 0 0 40 59 47 5 41 23.5 7 104 -68 40 57 29 41 2 5 40 53 56 41 5 37 -0.13 - 69 0 0 40 49 18 5 41 24.1 8 104 -67 40 46 59 40 51 36 40 43 27 40 55 9 -0.14 - 68 0 0 40 38 20 5 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time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 4937-00881-1 * constellation : Virgo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 11 47 31.8837 DE: -05 27 32.468 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 11 47 31.8840 DE: -05 27 32.470 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.100) * V mag [mag]: 9.5 * B mag [mag]: 9.7 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (7808) Bagould asteroid class: approx. diameter [km]: 8 approx. diameter ["]: 0.004 distance from Earth [AU]: 2.50690 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#51 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): 0.013", 0.003", 113.907° remarks: * orbital elements for (7808)Bagould : Mean anomaly = 268.5656292711 deg Arg. of pericenter = 354.7831620525 deg Long. of node = 271.9156090404 deg Inclination = 6.5441968180 deg Eccentricity = 0.1590584319 Semimajor axis = 2.5573140731 AU Perihelion dist = 2.1505517066 AU Mag: H = 12.78, G = 0.15 Epoch of elements : MJD 60661.24071583 TDT (2024 Dec 17.2407) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#512023Apr27,0.41,2024,12,17,5.777174,0.084222,0.129431,9.345906,-6.167316,-0.005382,0.002294,0.000000,0.000000 4.1919,-5.5969,92.40,-23.37,False TYC 4937-00881-1,11.79218988,-5.4590187,9.74,9.51,9.39,0.1,0,,11.81343210,-5.5968784,8.44,8.11,0,0,0 7808,Bagould,17.95,8.203,2.5069,0,0,2.197,-21.64,,0.8,0 0,268.5076,2024,12,17,354.7832,271.9156,6.5442,0.15906,2.55731,2.15055,12.79,5.0,0.15 1.770,0.0130,0.0027,114,0.0034,Known errors,1.12,0,-1,-1 20241217_0881-1,60140.74 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org