IOTA/IOTA-ES occultation update for (6712) Hornstein / TYC 6844-02256-1 event on 2024 Oct 15, 18:58 UT Visible from Summary ------- On 2024 Oct 15 UT, the 9.26279916768548 km diameter asteroid (6712) Hornstein will occult a 9.0 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 10.00 mag to 19.04 mag (the magnitude of the asteroid) for at most 0.330 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 15, 18:55 - 2024 Oct 15, 19:01 * geocentric midpoint of event [JD]: 2460599.29054350 * magnitude of target star: 9.04 * magnitude drop [mag]: 10.00 * estimated maximum duration [s]: 0.330 * Moon: 96 % sunlit, 85° distance * Sun: 71° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 11 * 1 sigma uncertainty interval [path widths]: +/- 0.27 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.002", 87°) * approx speed of asteroid's shadow [km/s]: 29.2638 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6844-02256-1 by 6712 Hornstein on 2024 Oct 15 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 -138 0 0 -31 6 14 18 55 17.6 0 117 54 -31 9 41 -31 2 48 -31 11 33 -31 0 56 .... -137 0 0 -31 32 28 18 55 17.7 1 116 54 -31 35 55 -31 29 1 -31 37 47 -31 27 9 0.54 -136 0 0 -31 58 39 18 55 17.8 2 116 55 -32 2 6 -31 55 12 -32 3 59 -31 53 20 0.57 -135 0 0 -32 24 48 18 55 18.1 3 115 55 -32 28 15 -32 21 21 -32 30 7 -32 19 28 0.59 -134 0 0 -32 50 52 18 55 18.3 4 114 56 -32 54 20 -32 47 26 -32 56 12 -32 45 33 0.60 -133 0 0 -33 16 53 18 55 18.7 5 114 56 -33 20 20 -33 13 26 -33 22 13 -33 11 33 0.60 -132 0 0 -33 42 48 18 55 19.1 6 113 56 -33 46 15 -33 39 21 -33 48 8 -33 37 29 0.61 -131 0 0 -34 8 38 18 55 19.6 7 113 57 -34 12 5 -34 5 11 -34 13 58 -34 3 18 0.61 -130 0 0 -34 34 21 18 55 20.2 8 112 57 -34 37 48 -34 30 54 -34 39 41 -34 29 1 0.61 -129 0 0 -34 59 57 18 55 20.8 9 112 57 -35 3 24 -34 56 30 -35 5 17 -34 54 37 0.61 -128 0 0 -35 25 25 18 55 21.5 10 111 58 -35 28 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24 16 19 1 23.2 12 250 -46 -32 27 43 -32 20 49 -32 29 36 -32 18 57 0.66 56 0 0 -31 58 3 19 1 24.1 11 250 -47 -32 1 30 -31 54 37 -32 3 23 -31 52 44 0.67 57 0 0 -31 31 48 19 1 24.8 10 249 -47 -31 35 15 -31 28 21 -31 37 7 -31 26 29 0.67 58 0 0 -31 5 30 19 1 25.5 9 249 -48 -31 8 57 -31 2 4 -31 10 49 -31 0 11 0.68 59 0 0 -30 39 11 19 1 26.1 8 248 -49 -30 42 38 -30 35 45 -30 44 30 -30 33 53 0.68 60 0 0 -30 12 51 19 1 26.7 7 247 -50 -30 16 18 -30 9 25 -30 18 10 -30 7 33 0.69 61 0 0 -29 46 31 19 1 27.2 6 247 -50 -29 49 57 -29 43 5 -29 51 50 -29 41 13 0.71 62 0 0 -29 20 12 19 1 27.6 5 246 -51 -29 23 38 -29 16 46 -29 25 30 -29 14 54 0.72 63 0 0 -28 53 54 19 1 27.9 4 246 -52 -28 57 20 -28 50 29 -28 59 12 -28 48 37 0.75 64 0 0 -28 27 39 19 1 28.2 3 246 -52 -28 31 5 -28 24 14 -28 32 56 -28 22 22 0.79 65 0 0 -28 1 27 19 1 28.4 2 245 -53 -28 4 52 -27 58 1 -28 6 44 -27 56 10 0.88 66 0 0 -27 35 18 19 1 28.5 1 245 -53 -27 38 43 -27 31 53 -27 40 34 -27 30 2 1.16 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 6844-02256-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 17 08.9488 DE: -22 51 22.130 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 17 08.9487 DE: -22 51 22.130 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 9.0 * B mag [mag]: 10.0 * Diameter [mas]: 0.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (6712) Hornstein asteroid class: approx. diameter [km]: 9 approx. diameter ["]: 0.005 distance from Earth [AU]: 2.38670 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): 0.015", 0.001", 86.982° remarks: * orbital elements for (6712)Hornstein : Mean anomaly = 58.9052343417 deg Arg. of pericenter = 322.4609394208 deg Long. of node = 263.9538735023 deg Inclination = 0.9683286384 deg Eccentricity = 0.1247280137 Semimajor axis = 2.3984169460 AU Perihelion dist = 2.0992671644 AU Mag: H = 14.23, G = 0.15 Epoch of elements : MJD 60598.79054329 TDT (2024 Oct 15.7905) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#502023Apr27,0.33,2024,10,15,18.973044,0.018417,-0.523498,16.506629,0.593037,0.005219,0.000185,0.000000,0.000000 -34.7332,-22.8481,-108.19,-8.91,False TYC 6844-02256-1,18.28581914,-22.8561471,9.99,9.04,8.53,0.2,0,,18.31067115,-22.8480714,10.00,10.07,0,0,0 6712,Hornstein,19.04,9.609,2.3867,0,0,4.400,2.19,,0.8,0 0,58.6955,2024,10,15,322.4609,263.9539,0.9683,0.12473,2.39842,2.09927,14.23,5.0,0.15 1.272,0.0147,0.0015,87,0.0015,Known errors,0.75,0,-1,-1 20241015_2256-1,60140.64 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:16 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org