IOTA/IOTA-ES occultation update for (240) Vanadis / TYC 6338-01074-1 event on 2023 Oct 19, 18:07 UT Visible from Africa Summary ------- On 2023 Oct 19 UT, the 93.9 km diameter asteroid (240) Vanadis will occult a 10.9 mag star in the constellation Capricornus for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.09 mag to 13.92 mag (the magnitude of the asteroid) for at most 8.790 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: 2023 Oct 19, 17:57 - 2023 Oct 19, 18:17 * geocentric midpoint of event [JD]: 2460237.25516487 * magnitude of target star: 10.90 * magnitude drop [mag]: 3.09 * estimated maximum duration [s]: 8.790 * Moon: 24 % sunlit, 42° distance * Sun: 101° distance * rough path description: Africa Additional comments ------------------- no proper motion The occultation path -------------------- * approximate projected width [km]: 96 * 1 sigma uncertainty interval [path widths]: +/- 0.18 * 1 sigma uncertainty interval [seconds]: +/- 2.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.011) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.011", 84°) * approx speed of asteroid's shadow [km/s]: 10.6826 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6338-01074-1 by 240 Vanadis on 2023 Oct 19 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 0 0 0 .. .. .... .. .. .. .. .. .. -24 48 42 .. .. .. -24 58 53 .. .. .. .... - 86 0 0 -24 42 36 17 57 41.2 1 112 74 -25 10 38 -24 14 37 -25 20 48 -24 4 29 .... - 85 0 0 -25 4 17 17 57 41.5 2 111 73 -25 32 17 -24 36 20 -25 42 26 -24 26 14 0.23 - 84 0 0 -25 25 40 17 57 41.9 3 111 72 -25 53 37 -24 57 46 -26 3 46 -24 47 40 0.22 - 83 0 0 -25 46 45 17 57 42.5 4 110 72 -26 14 40 -25 18 54 -26 24 47 -25 8 49 0.22 - 82 0 0 -26 7 32 17 57 43.3 5 110 71 -26 35 23 -25 39 43 -26 45 30 -25 29 39 0.22 - 81 0 0 -26 27 59 17 57 44.2 6 109 70 -26 55 48 -26 0 13 -27 5 54 -25 50 11 0.22 - 80 0 0 -26 48 8 17 57 45.3 7 109 69 -27 15 54 -26 20 25 -27 25 58 -26 10 23 0.22 - 79 0 0 -27 7 57 17 57 46.6 8 108 68 -27 35 40 -26 40 16 -27 45 43 -26 30 15 0.22 - 78 0 0 -27 27 26 17 57 48.0 9 108 68 -27 55 6 -26 59 48 -28 5 9 -26 49 49 0.22 - 77 0 0 -27 46 35 17 57 49.6 10 108 67 -28 14 13 -27 19 1 -28 24 14 -27 9 2 0.21 - 76 0 0 -28 5 24 17 57 51.4 10 107 66 -28 32 59 -27 37 53 -28 42 59 -27 27 55 0.21 - 75 0 0 -28 23 53 17 57 53.3 11 107 65 -28 51 24 -27 56 24 -29 1 24 -27 46 27 0.21 - 74 0 0 -28 42 1 17 57 55.3 12 106 64 -29 9 30 -28 14 35 -29 19 28 -28 4 39 0.21 - 73 0 0 -28 59 48 17 57 57.5 13 106 63 -29 27 14 -28 32 25 -29 37 11 -28 22 31 0.21 - 72 0 0 -29 17 14 17 57 59.9 14 105 62 -29 44 37 -28 49 54 -29 54 33 -28 40 1 0.21 - 71 0 0 -29 34 19 17 58 2.4 15 105 62 -30 1 39 -29 7 2 -30 11 34 -28 57 10 0.21 - 70 0 0 -29 51 3 17 58 5.0 16 104 61 -30 18 20 -29 23 49 -30 28 13 -29 13 57 0.21 - 69 0 0 -30 7 25 17 58 7.8 17 104 60 -30 34 39 -29 40 14 -30 44 32 -29 30 24 0.21 - 68 0 0 -30 23 26 17 58 10.7 18 103 59 -30 50 37 -29 56 18 -31 0 28 -29 46 28 0.21 - 67 0 0 -30 39 5 17 58 13.8 19 102 58 -31 6 12 -30 11 59 -31 16 3 -30 2 11 0.21 - 66 0 0 -30 54 22 17 58 17.0 20 102 57 -31 21 27 -30 27 19 -31 31 16 -30 17 32 0.21 - 65 0 0 -31 9 17 17 58 20.3 21 101 56 -31 36 19 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250 -74 2 30 7 3 25 35 2 20 2 3 35 36 0.68 Uncertainty in time = +/- 2 secs Prediction of 2023 Oct 15.9 Data for the target star ------------------------ * name: TYC 6338-01074-1 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 38 06.6948 DE: -19 57 04.516 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 38 06.6948 DE: -19 57 04.516 * position source: pos:Gaia DR3, pm:UCAC5 * standard error: RA,DE [mas]: (12.700,10.900) * V mag [mag]: 10.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (240) Vanadis asteroid class: approx. diameter [km]: 94 approx. diameter ["]: 0.061 distance from Earth [AU]: 2.12520 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#72 date of fit: 2023 Oct 09 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): 0.007", 0.000", 78.275° remarks: * orbital elements for (240)Vanadis : Mean anomaly = 297.1353010850 deg Arg. of pericenter = 300.9595569496 deg Long. of node = 115.0630313435 deg Inclination = 2.1057713613 deg Eccentricity = 0.2088488346 Semimajor axis = 2.6626701137 AU Perihelion dist = 2.1065745635 AU Mag: H = 9.19, G = 0.15 Epoch of elements : MJD 60236.75534722 TDT (2023 Oct 19.7553) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#722023Oct09,8.79,2023,10,19,18.123957,0.049047,-0.189435,5.834822,1.519897,0.005420,0.001459,0.000000,0.000000 10.0527,-19.8689,-95.61,-10.08,False TYC 6338-01074-1,20.63519304,-19.9512544,0.00,10.90,0.00,0.0,0,,20.65792999,-19.8689193,3.08,0.00,0,0,0 240,Vanadis,13.92,93.900,2.1252,0,0,1.713,6.29,,5.2,0 0,296.9640,2023,10,19,300.9596,115.0630,2.1058,0.20885,2.66267,2.10657,9.19,5.0,0.15 1.181,0.0145,0.0110,84,0.0181,Known errors,-1.00,0,-1,-1 20231019_1074-1,60232.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Oct 15, 20:55 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org