IOTA/IOTA-ES occultation update for (3705) Hotellasilla / UCAC4 344-083721 event on 2024 Oct 13, 23:26 UT Visible from Summary ------- On 2024 Oct 13 UT, the 17.88 km diameter asteroid (3705) Hotellasilla will occult a 11.9 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 7.05 mag to 18.97 mag (the magnitude of the asteroid) for at most 0.550 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 13, 23:22 - 2024 Oct 13, 23:29 * geocentric midpoint of event [JD]: 2460597.47648341 * magnitude of target star: 11.92 * magnitude drop [mag]: 7.05 * estimated maximum duration [s]: 0.550 * Moon: 82 % sunlit, 77° distance * Sun: 53° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 18 * 1 sigma uncertainty interval [path widths]: +/- 0.26 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.002", 97°) * approx speed of asteroid's shadow [km/s]: 32.7231 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 344-083721 by 3705 Hotellasilla on 2024 Oct 13 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 149 0 0 - 1 52 34 23 22 55.9 0 111 53 - 1 57 51 - 1 47 17 - 2 0 34 - 1 44 34 .... 150 0 0 - 2 16 24 23 22 55.9 1 111 54 - 2 21 41 - 2 11 6 - 2 24 25 - 2 8 23 0.20 151 0 0 - 2 40 24 23 22 56.1 2 111 55 - 2 45 42 - 2 35 6 - 2 48 25 - 2 32 22 0.19 152 0 0 - 3 4 33 23 22 56.3 4 111 56 - 3 9 52 - 2 59 15 - 3 12 35 - 2 56 32 0.18 153 0 0 - 3 28 52 23 22 56.5 5 111 57 - 3 34 11 - 3 23 34 - 3 36 55 - 3 20 50 0.18 154 0 0 - 3 53 20 23 22 56.9 6 111 58 - 3 58 39 - 3 48 1 - 4 1 22 - 3 45 17 0.18 155 0 0 - 4 17 55 23 22 57.3 7 111 59 - 4 23 14 - 4 12 36 - 4 25 58 - 4 9 52 0.18 156 0 0 - 4 42 38 23 22 57.7 8 111 60 - 4 47 57 - 4 37 18 - 4 50 41 - 4 34 34 0.18 157 0 0 - 5 7 27 23 22 58.3 9 111 61 - 5 12 47 - 5 2 8 - 5 15 31 - 4 59 24 0.18 158 0 0 - 5 32 23 23 22 58.9 10 111 62 - 5 37 43 - 5 27 3 - 5 40 27 - 5 24 19 0.18 159 0 0 - 5 57 25 23 22 59.6 11 111 63 - 6 2 45 - 5 52 5 - 6 5 29 - 5 49 20 0.18 160 0 0 - 6 22 31 23 23 0.3 12 111 64 - 6 27 51 - 6 17 11 - 6 30 36 - 6 14 26 0.18 161 0 0 - 6 47 42 23 23 1.1 13 110 65 - 6 53 2 - 6 42 21 - 6 55 47 - 6 39 37 0.18 162 0 0 - 7 12 56 23 23 2.0 14 110 66 - 7 18 16 - 7 7 35 - 7 21 1 - 7 4 51 0.18 163 0 0 - 7 38 13 23 23 3.0 15 110 67 - 7 43 34 - 7 32 53 - 7 46 19 - 7 30 8 0.18 164 0 0 - 8 3 33 23 23 4.0 16 110 68 - 8 8 54 - 7 58 13 - 8 11 39 - 7 55 28 0.17 165 0 0 - 8 28 55 23 23 5.1 18 110 69 - 8 34 16 - 8 23 34 - 8 37 1 - 8 20 49 0.17 166 0 0 - 8 54 18 23 23 6.2 19 110 70 - 8 59 39 - 8 48 57 - 9 2 24 - 8 46 12 0.17 167 0 0 - 9 19 41 23 23 7.5 20 110 71 - 9 25 2 - 9 14 20 - 9 27 47 - 9 11 35 0.17 168 0 0 - 9 45 4 23 23 8.8 21 109 72 - 9 50 25 - 9 39 43 - 9 53 10 - 9 36 58 0.17 169 0 0 -10 10 27 23 23 10.1 22 109 73 -10 15 48 -10 5 6 -10 18 33 -10 2 21 0.17 170 0 0 -10 35 48 23 23 11.5 23 109 74 -10 41 9 -10 30 27 -10 43 54 -10 27 42 0.17 171 0 0 -11 1 7 23 23 13.0 24 109 75 -11 6 28 -10 55 46 -11 9 13 -10 53 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19 0.18 - 43 0 0 -22 15 23 23 29 11.2 17 253 -35 -22 20 36 -22 10 10 -22 23 18 -22 7 29 0.18 - 42 0 0 -21 55 17 23 29 12.2 16 253 -36 -22 0 31 -21 50 3 -22 3 12 -21 47 22 0.18 - 41 0 0 -21 34 54 23 29 13.2 15 253 -37 -21 40 9 -21 29 40 -21 42 50 -21 26 59 0.18 - 40 0 0 -21 14 16 23 29 14.0 14 252 -38 -21 19 30 -21 9 1 -21 22 12 -21 6 20 0.19 - 39 0 0 -20 53 21 23 29 14.9 13 252 -39 -20 58 36 -20 48 6 -21 1 18 -20 45 25 0.19 - 38 0 0 -20 32 11 23 29 15.7 12 252 -40 -20 37 27 -20 26 56 -20 40 9 -20 24 14 0.19 - 37 0 0 -20 10 47 23 29 16.4 11 251 -41 -20 16 2 -20 5 31 -20 18 45 -20 2 49 0.19 - 36 0 0 -19 49 7 23 29 17.0 10 251 -42 -19 54 23 -19 43 51 -19 57 5 -19 41 9 0.19 - 35 0 0 -19 27 13 23 29 17.7 9 251 -43 -19 32 29 -19 21 57 -19 35 12 -19 19 14 0.19 - 34 0 0 -19 5 5 23 29 18.2 8 250 -44 -19 10 22 -18 59 49 -19 13 5 -18 57 6 0.20 - 33 0 0 -18 42 44 23 29 18.7 7 250 -45 -18 48 1 -18 37 27 -18 50 44 -18 34 44 0.20 - 32 0 0 -18 20 10 23 29 19.1 6 250 -46 -18 25 27 -18 14 53 -18 28 11 -18 12 10 0.21 - 31 0 0 -17 57 23 23 29 19.5 5 249 -47 -18 2 41 -17 52 6 -18 5 24 -17 49 22 0.21 - 30 0 0 -17 34 24 23 29 19.8 4 249 -48 -17 39 42 -17 29 6 -17 42 26 -17 26 23 0.22 - 29 0 0 -17 11 14 23 29 20.0 3 249 -49 -17 16 32 -17 5 56 -17 19 16 -17 3 12 0.24 - 28 0 0 -16 47 52 23 29 20.2 2 248 -50 -16 53 11 -16 42 34 -16 55 55 -16 39 50 0.27 - 27 0 0 -16 24 20 23 29 20.3 1 248 -51 -16 29 39 -16 19 1 -16 32 23 -16 16 17 0.35 - 26 0 0 -16 0 37 23 29 20.4 0 248 -52 -16 5 56 -15 55 18 -16 8 40 -15 52 35 1.26 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 344-083721 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 51 11.3713 DE: -21 22 18.848 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 51 11.3711 DE: -21 22 18.848 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.9 * B mag [mag]: 12.4 * Diameter [mas]: 0.00 * 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]: 3.86060 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", 96.656° remarks: * orbital elements for (3705)Hotellasilla : Mean anomaly = 252.7093399784 deg Arg. of pericenter = 237.9199167873 deg Long. of node = 154.1821149713 deg Inclination = 1.4005097603 deg Eccentricity = 0.1679665568 Semimajor axis = 3.1300886480 AU Perihelion dist = 2.6043384353 AU Mag: H = 12.62, G = 0.15 Epoch of elements : MJD 60596.97648338 TDT (2024 Oct 13.9765) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,0.55,2024,10,13,23.435602,-0.021575,-0.162977,18.308692,-2.434305,0.004665,-0.000470,-0.000001,0.000000 -121.3818,-21.4143,-175.03,-8.24,False UCAC4 344-083721,16.85315872,-21.3719022,12.40,11.92,11.66,0.0,0,,16.87745656,-21.4142519,7.06,6.87,0,0,0 3705,Hotellasilla,18.97,17.880,3.8606,0,0,2.987,-5.55,,1.8,0 0,252.5355,2024,10,13,237.9199,154.1821,1.4005,0.16797,3.13009,2.60434,12.62,5.0,0.15 1.257,0.0123,0.0016,97,0.0016,Known errors,1.03,0,-1,-1 20241013_083721,60140.63 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:09 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org