IOTA/IOTA-ES occultation update for (3705) Hotellasilla / UCAC4 343-087613 event on 2024 Oct 17, 16:51 UT Visible from Summary ------- On 2024 Oct 17 UT, the 17.6646077830496 km diameter asteroid (3705) Hotellasilla will occult a 10.4 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 8.57 mag to 18.97 mag (the magnitude of the asteroid) for at most 0.540 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 17, 16:48 - 2024 Oct 17, 16:54 * geocentric midpoint of event [JD]: 2460601.20243804 * magnitude of target star: 10.40 * magnitude drop [mag]: 8.57 * estimated maximum duration [s]: 0.540 * Moon: 100 % sunlit, 133° distance * Sun: 51° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 18 * 1 sigma uncertainty interval [path widths]: +/- 0.25 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.002", 96°) * approx speed of asteroid's shadow [km/s]: 33.8646 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 343-087613 by 3705 Hotellasilla on 2024 Oct 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 -114 0 0 0 45 8 16 48 23.5 0 112 51 0 39 47 0 50 29 0 37 2 0 53 14 .... -113 0 0 0 21 10 16 48 23.6 1 112 52 0 15 49 0 26 32 0 13 4 0 29 17 0.17 -112 0 0 - 0 2 57 16 48 23.7 2 112 53 - 0 8 19 0 2 24 - 0 11 4 0 5 10 0.14 -111 0 0 - 0 27 14 16 48 23.9 3 112 54 - 0 32 36 - 0 21 52 - 0 35 21 - 0 19 6 0.14 -110 0 0 - 0 51 38 16 48 24.1 4 112 55 - 0 57 1 - 0 46 16 - 0 59 46 - 0 43 31 0.13 -109 0 0 - 1 16 11 16 48 24.4 6 112 56 - 1 21 33 - 1 10 48 - 1 24 19 - 1 8 3 0.13 -108 0 0 - 1 40 50 16 48 24.8 7 112 57 - 1 46 13 - 1 35 28 - 1 48 59 - 1 32 42 0.12 -107 0 0 - 2 5 37 16 48 25.2 8 111 58 - 2 11 0 - 2 0 14 - 2 13 46 - 1 57 28 0.12 -106 0 0 - 2 30 29 16 48 25.8 9 111 59 - 2 35 53 - 2 25 6 - 2 38 38 - 2 22 20 0.12 -105 0 0 - 2 55 27 16 48 26.3 10 111 60 - 3 0 51 - 2 50 4 - 3 3 37 - 2 47 18 0.12 -104 0 0 - 3 20 30 16 48 27.0 11 111 61 - 3 25 53 - 3 15 7 - 3 28 40 - 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37.8 2 248 -48 -13 16 15 -13 5 32 -13 19 0 -13 2 46 0.21 68 0 0 -12 47 11 16 54 37.9 1 248 -49 -12 52 33 -12 41 49 -12 55 18 -12 39 3 0.32 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 343-087613 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 55 41.9224 DE: -21 30 34.050 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 55 41.9224 DE: -21 30 34.050 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.4 * B mag [mag]: 11.5 * Diameter [mas]: 0.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3705) Hotellasilla asteroid class: approx. diameter [km]: 18 approx. diameter ["]: 0.006 distance from Earth [AU]: 3.89780 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#54 date of fit: 2023 Apr 24 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): 0.012", 0.002", 96.233° remarks: * orbital elements for (3705)Hotellasilla : Mean anomaly = 253.3710868705 deg Arg. of pericenter = 237.9211442832 deg Long. of node = 154.1820645915 deg Inclination = 1.4005103050 deg Eccentricity = 0.1679663461 Semimajor axis = 3.1300789491 AU Perihelion dist = 2.6043310251 AU Mag: H = 12.62, G = 0.15 Epoch of elements : MJD 60600.70243792 TDT (2024 Oct 17.7024) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,0.54,2024,10,17,16.858513,-0.013918,-0.107226,18.968293,-2.356395,0.004519,-0.000419,-0.000001,0.000000 -25.2701,-21.5492,-76.57,-9.61,False UCAC4 343-087613,16.92831183,-21.5094583,11.46,10.40,9.83,0.2,0,,16.95264154,-21.5492225,8.57,8.70,0,0,0 3705,Hotellasilla,18.97,18.230,3.8978,0,0,3.068,-5.31,,1.8,0 0,253.2461,2024,10,17,237.9211,154.1821,1.4005,0.16797,3.13008,2.60433,12.62,5.0,0.15 1.257,0.0123,0.0016,96,0.0016,Known errors,0.98,0,-1,-1 20241017_087613,60140.64 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:23 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org