IOTA/IOTA-ES occultation update for (175114) 2004 QQ / UCAC4 365-112389 event on 2024 Oct 27, 10:14 UT Visible from Summary ------- On 2024 Oct 27 UT, the 1.57642860489357 km diameter asteroid (175114) 2004 QQ will occult a 13.1 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 5.19 mag to 18.25 mag (the magnitude of the asteroid) for at most 0.050 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: 5 * date and approx. time of event: 2024 Oct 27, 10:11 - 2024 Oct 27, 10:17 * geocentric midpoint of event [JD]: 2460610.92700221 * magnitude of target star: 13.07 * magnitude drop [mag]: 5.19 * estimated maximum duration [s]: 0.050 * Moon: 22 % sunlit, 109° distance * Sun: 54° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 2 * 1 sigma uncertainty interval [path widths]: +/- 13.01 * 1 sigma uncertainty interval [seconds]: +/- 1.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.094, +/- 0.053) * 1 sigma uncertainty ellipse (major, minor, PA): (0.105", 0.026", 63°) * approx speed of asteroid's shadow [km/s]: 31.7250 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 365-112389 by 175114 2004 QQ on 2024 Oct 27 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 - 23 0 0 -34 3 20 10 11 56.5 0 111 43 -34 3 52 -34 2 48 -34 17 40 .. .. .. .... - 22 0 0 -34 22 19 10 11 56.5 1 110 44 -34 22 51 -34 21 47 -34 36 39 -34 8 1 0.43 - 21 0 0 -34 41 9 10 11 56.6 2 110 45 -34 41 41 -34 40 37 -34 55 29 -34 26 52 0.49 - 20 0 0 -34 59 50 10 11 56.8 3 109 45 -35 0 22 -34 59 18 -35 14 9 -34 45 33 0.51 - 19 0 0 -35 18 22 10 11 57.0 4 109 46 -35 18 54 -35 17 49 -35 32 40 -35 4 5 0.52 - 18 0 0 -35 36 43 10 11 57.2 4 108 47 -35 37 15 -35 36 11 -35 51 1 -35 22 27 0.52 - 17 0 0 -35 54 54 10 11 57.5 5 107 47 -35 55 26 -35 54 22 -36 9 11 -35 40 39 0.53 - 16 0 0 -36 12 54 10 11 57.8 6 107 48 -36 13 26 -36 12 22 -36 27 11 -35 58 40 0.53 - 15 0 0 -36 30 44 10 11 58.2 7 106 49 -36 31 16 -36 30 12 -36 44 59 -36 16 30 0.53 - 14 0 0 -36 48 22 10 11 58.7 8 106 49 -36 48 54 -36 47 50 -37 2 37 -36 34 9 0.53 - 13 0 0 -37 5 48 10 11 59.2 9 105 50 -37 6 20 -37 5 16 -37 20 2 -36 51 36 0.54 - 12 0 0 -37 23 3 10 11 59.7 10 104 50 -37 23 35 -37 22 31 -37 37 16 -37 8 52 0.54 - 11 0 0 -37 40 6 10 12 0.3 10 104 51 -37 40 38 -37 39 34 -37 54 18 -37 25 55 0.54 - 10 0 0 -37 56 56 10 12 0.9 11 103 52 -37 57 28 -37 56 24 -38 11 8 -37 42 47 0.54 - 9 0 0 -38 13 34 10 12 1.6 12 102 52 -38 14 6 -38 13 2 -38 27 45 -37 59 25 0.54 - 8 0 0 -38 29 59 10 12 2.3 13 102 53 -38 30 31 -38 29 27 -38 44 9 -38 15 51 0.54 - 7 0 0 -38 46 11 10 12 3.1 14 101 53 -38 46 43 -38 45 39 -39 0 20 -38 32 4 0.54 - 6 0 0 -39 2 10 10 12 3.9 15 101 54 -39 2 42 -39 1 38 -39 16 18 -38 48 4 0.54 - 5 0 0 -39 17 55 10 12 4.8 15 100 54 -39 18 27 -39 17 24 -39 32 2 -39 3 50 0.54 - 4 0 0 -39 33 27 10 12 5.6 16 99 54 -39 33 59 -39 32 56 -39 47 33 -39 19 23 0.54 - 3 0 0 -39 48 45 10 12 6.6 17 99 55 -39 49 17 -39 48 14 -40 2 50 -39 34 42 0.54 - 2 0 0 -40 3 49 10 12 7.5 18 98 55 -40 4 21 -40 3 18 -40 17 53 -39 49 47 0.54 - 1 0 0 -40 18 39 10 12 8.6 19 97 56 -40 19 11 -40 18 7 -40 32 42 -40 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-25 11 22 -24 42 45 0.58 161 0 0 -24 36 34 10 17 44.1 13 257 -35 -24 37 6 -24 36 2 -24 50 53 -24 22 17 0.58 162 0 0 -24 16 10 10 17 44.9 12 256 -36 -24 16 42 -24 15 38 -24 30 28 -24 1 54 0.58 163 0 0 -23 55 50 10 17 45.7 11 256 -37 -23 56 23 -23 55 18 -24 10 8 -23 41 35 0.58 164 0 0 -23 35 36 10 17 46.4 10 255 -38 -23 36 9 -23 35 4 -23 49 53 -23 21 22 0.59 165 0 0 -23 15 28 10 17 47.0 9 255 -39 -23 16 0 -23 14 56 -23 29 44 -23 1 14 0.59 166 0 0 -22 55 26 10 17 47.6 8 255 -40 -22 55 58 -22 54 54 -23 9 42 -22 41 13 0.60 167 0 0 -22 35 31 10 17 48.1 7 254 -41 -22 36 3 -22 34 59 -22 49 46 -22 21 19 0.61 168 0 0 -22 15 44 10 17 48.6 6 254 -42 -22 16 16 -22 15 12 -22 29 57 -22 1 32 0.61 169 0 0 -21 56 4 10 17 48.9 5 253 -43 -21 56 36 -21 55 32 -22 10 17 -21 41 53 0.63 170 0 0 -21 36 32 10 17 49.3 4 253 -44 -21 37 4 -21 36 0 -21 50 44 -21 22 22 0.65 171 0 0 -21 17 9 10 17 49.5 3 253 -45 -21 17 41 -21 16 37 -21 31 20 -21 3 0 0.68 172 0 0 -20 57 55 10 17 49.7 2 252 -45 -20 58 27 -20 57 24 -21 12 5 -20 43 47 0.75 173 0 0 -20 38 51 10 17 49.8 1 252 -46 -20 39 23 -20 38 19 -20 53 0 -20 24 44 0.94 174 0 0 -20 19 57 10 17 49.8 0 252 -47 -20 20 29 -20 19 25 -20 34 6 .. .. .. 10.32 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 365-112389 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 51 30.4279 DE: -17 11 11.499 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 51 30.4279 DE: -17 11 11.499 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 13.1 * B mag [mag]: 14.8 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (175114) 2004 QQ asteroid class: approx. diameter [km]: 2 approx. diameter ["]: 0.003 distance from Earth [AU]: 0.66970 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#134 date of fit: 2023 Mar 01 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): 0.105", 0.026", 62.614° remarks: * orbital elements for (175114)2004 QQ : Mean anomaly = 5.2098350068 deg Arg. of pericenter = 31.4887532381 deg Long. of node = 288.0797575077 deg Inclination = 5.7189553666 deg Eccentricity = 0.6632842895 Semimajor axis = 2.2497630065 AU Perihelion dist = 0.7575305492 AU Mag: H = 16.64, G = 0.15 Epoch of elements : MJD 60610.42700225 TDT (2024 Oct 27.4270) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1342023Mar01,0.05,2024,10,27,10.248053,0.059543,-0.472139,17.763530,2.258276,-0.004172,-0.000284,0.000001,0.000000 78.2453,-17.1933,22.24,-13.02,False UCAC4 365-112389,17.85845232,-17.1865273,14.82,13.07,12.13,0.1,0,,17.88220984,-17.1932611,5.19,5.68,0,0,0 175114,2004 QQ,18.25,1.625,0.6697,0,0,16.285,29.71,,0.2,0 0,5.0851,2024,10,27,31.4888,288.0798,5.7190,0.66328,2.24976,0.75753,16.64,5.0,0.15 13.839,0.1047,0.0260,63,0.0435,Known errors,1.01,0,-1,-1 20241027_112389,60140.66 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org