IOTA/IOTA-ES occultation update for (12894) 1998 QN73 / UCAC4 371-166026 event on 2024 Nov 13, 10:39 UT Visible from Summary ------- On 2024 Nov 13 UT, the 12.26 km diameter asteroid (12894) 1998 QN73 will occult a 10.3 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 7.94 mag to 18.19 mag (the magnitude of the asteroid) for at most 0.340 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: 94 * date and approx. time of event: 2024 Nov 13, 10:36 - 2024 Nov 13, 10:42 * geocentric midpoint of event [JD]: 2460627.94422091 * magnitude of target star: 10.25 * magnitude drop [mag]: 7.94 * estimated maximum duration [s]: 0.340 * Moon: 91 % sunlit, 88° distance * Sun: 58° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 0.46 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.002", 71°) * approx speed of asteroid's shadow [km/s]: 36.4306 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 371-166026 by 12894 1998 QN73 on 2024 Nov 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 - 18 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. -19 33 37 .. .. .. .... - 17 0 0 -19 43 58 10 36 48.6 1 107 58 -19 47 30 -19 40 26 -19 50 45 -19 37 11 .... - 16 0 0 -20 0 54 10 36 48.7 2 106 59 -20 4 26 -19 57 23 -20 7 41 -19 54 8 0.19 - 15 0 0 -20 17 39 10 36 48.8 3 106 60 -20 21 10 -20 14 7 -20 24 25 -20 10 52 0.19 - 14 0 0 -20 34 10 10 36 49.0 4 105 61 -20 37 42 -20 30 39 -20 40 57 -20 27 25 0.19 - 13 0 0 -20 50 30 10 36 49.2 5 105 62 -20 54 1 -20 46 59 -20 57 16 -20 43 44 0.19 - 12 0 0 -21 6 36 10 36 49.5 6 105 63 -21 10 7 -21 3 6 -21 13 22 -20 59 51 0.19 - 11 0 0 -21 22 30 10 36 49.9 7 104 64 -21 26 1 -21 18 59 -21 29 15 -21 15 45 0.19 - 10 0 0 -21 38 10 10 36 50.2 8 104 64 -21 41 41 -21 34 40 -21 44 55 -21 31 26 0.19 - 9 0 0 -21 53 37 10 36 50.7 9 104 65 -21 57 7 -21 50 6 -22 0 21 -21 46 53 0.19 - 8 0 0 -22 8 49 10 36 51.2 10 103 66 -22 12 19 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40 19 10 42 27.6 14 255 -42 - 4 43 52 - 4 36 46 - 4 47 9 - 4 33 29 0.20 154 0 0 - 4 20 57 10 42 28.4 13 255 -43 - 4 24 30 - 4 17 24 - 4 27 47 - 4 14 7 0.20 155 0 0 - 4 1 43 10 42 29.1 12 255 -44 - 4 5 16 - 3 58 10 - 4 8 33 - 3 54 54 0.20 156 0 0 - 3 42 37 10 42 29.8 11 255 -45 - 3 46 10 - 3 39 5 - 3 49 27 - 3 35 48 0.21 157 0 0 - 3 23 40 10 42 30.3 10 254 -46 - 3 27 13 - 3 20 8 - 3 30 29 - 3 16 52 0.21 158 0 0 - 3 4 53 10 42 30.9 9 254 -47 - 3 8 25 - 3 1 20 - 3 11 41 - 2 58 4 0.21 159 0 0 - 2 46 14 10 42 31.3 8 254 -48 - 2 49 47 - 2 42 42 - 2 53 3 - 2 39 26 0.21 160 0 0 - 2 27 46 10 42 31.8 7 254 -49 - 2 31 18 - 2 24 14 - 2 34 34 - 2 20 58 0.22 161 0 0 - 2 9 28 10 42 32.1 6 254 -50 - 2 13 0 - 2 5 56 - 2 16 16 - 2 2 40 0.22 162 0 0 - 1 51 20 10 42 32.4 5 254 -51 - 1 54 52 - 1 47 49 - 1 58 8 - 1 44 33 0.23 163 0 0 - 1 33 24 10 42 32.6 4 254 -52 - 1 36 56 - 1 29 52 - 1 40 11 - 1 26 37 0.24 164 0 0 - 1 15 39 10 42 32.8 3 254 -53 - 1 19 10 - 1 12 7 - 1 22 25 - 1 8 52 0.26 165 0 0 - 0 58 5 10 42 32.9 2 254 -54 - 1 1 37 - 0 54 34 - 1 4 52 - 0 51 19 0.32 166 0 0 - 0 40 44 10 42 33.0 0 254 -55 - 0 44 15 - 0 37 13 - 0 47 30 - 0 33 58 0.60 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 371-166026 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 18 32.9870 DE: -15 54 04.337 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 18 32.9870 DE: -15 54 04.337 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 10.3 * B mag [mag]: 10.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (12894) 1998 QN73 asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.007 distance from Earth [AU]: 2.49230 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#44 date of fit: 2023 Apr 25 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): 0.014", 0.002", 70.912° remarks: * orbital elements for (12894)1998 QN73 : Mean anomaly = 355.9704716555 deg Arg. of pericenter = 49.5674325856 deg Long. of node = 269.3804113522 deg Inclination = 10.6577499430 deg Eccentricity = 0.2051201907 Semimajor axis = 2.6883530384 AU Perihelion dist = 2.1369175505 AU Mag: H = 13.46, G = 0.15 Epoch of elements : MJD 60627.44422058 TDT (2024 Nov 13.4442) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#442023Apr25,0.34,2024,11,13,10.661302,0.030125,-0.177049,20.263478,3.493664,0.004564,0.000954,-0.000001,0.000000 77.0297,-15.8567,16.17,-18.15,False UCAC4 371-166026,19.30916312,-15.9012046,10.36,10.25,10.19,0.0,0,,19.33261794,-15.8566534,7.94,7.55,0,0,0 12894,1998 QN73,18.19,12.260,2.4923,0,0,4.955,12.33,,0.6,0 0,355.8711,2024,11,13,49.5674,269.3804,10.6577,0.20512,2.68835,2.13692,13.46,5.0,0.15 1.461,0.0140,0.0022,71,0.0031,Known errors,0.79,0,-1,-1 20241113_166026,60140.70 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org