IOTA/IOTA-ES occultation update for (2012) Guo / UCAC4 354-177341 event on 2024 Oct 10, 16:14 UT Visible from Summary ------- On 2024 Oct 10 UT, the 11.9839167935931 km diameter asteroid (2012) Guo will occult a 9.3 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 7.97 mag to 17.28 mag (the magnitude of the asteroid) for at most 0.650 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 10, 16:08 - 2024 Oct 10, 16:19 * geocentric midpoint of event [JD]: 2460594.17644479 * magnitude of target star: 9.31 * magnitude drop [mag]: 7.97 * estimated maximum duration [s]: 0.650 * Moon: 49 % sunlit, 10° distance * Sun: 94° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 0.33 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.021, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.022", 0.003", 77°) * approx speed of asteroid's shadow [km/s]: 18.7026 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 354-177341 by 2012 Guo on 2024 Oct 10 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 - 60 0 0 - 5 48 54 16 8 24.4 1 109 84 - 5 52 25 - 5 45 24 - 5 54 44 - 5 43 5 .... - 59 0 0 - 6 9 42 16 8 24.6 2 109 84 - 6 13 12 - 6 6 11 - 6 15 31 - 6 3 53 0.03 - 58 0 0 - 6 30 17 16 8 24.9 3 109 83 - 6 33 48 - 6 26 47 - 6 36 6 - 6 24 29 0.00 - 57 0 0 - 6 50 41 16 8 25.2 4 109 82 - 6 54 11 - 6 47 11 - 6 56 29 - 6 44 52 -0.01 - 56 0 0 - 7 10 51 16 8 25.7 5 109 81 - 7 14 21 - 7 7 21 - 7 16 39 - 7 5 3 -0.02 - 55 0 0 - 7 30 48 16 8 26.3 6 109 80 - 7 34 18 - 7 27 18 - 7 36 36 - 7 25 0 -0.03 - 54 0 0 - 7 50 32 16 8 27.1 7 108 79 - 7 54 1 - 7 47 2 - 7 56 19 - 7 44 44 -0.03 - 53 0 0 - 8 10 1 16 8 27.9 8 108 78 - 8 13 30 - 8 6 32 - 8 15 48 - 8 4 14 -0.03 - 52 0 0 - 8 29 16 16 8 28.8 9 108 77 - 8 32 45 - 8 25 47 - 8 35 3 - 8 23 30 -0.03 - 51 0 0 - 8 48 17 16 8 29.9 10 108 76 - 8 51 45 - 8 44 48 - 8 54 3 - 8 42 31 -0.04 - 50 0 0 - 9 7 2 16 8 31.0 11 108 75 - 9 10 31 - 9 3 34 - 9 12 48 - 9 1 16 -0.04 - 49 0 0 - 9 25 32 16 8 32.3 12 108 74 - 9 29 0 - 9 22 4 - 9 31 17 - 9 19 47 -0.04 - 48 0 0 - 9 43 46 16 8 33.7 13 108 73 - 9 47 14 - 9 40 18 - 9 49 31 - 9 38 1 -0.04 - 47 0 0 -10 1 44 16 8 35.2 14 107 72 -10 5 12 - 9 58 16 -10 7 29 - 9 55 59 -0.04 - 46 0 0 -10 19 26 16 8 36.8 15 107 70 -10 22 53 -10 15 58 -10 25 10 -10 13 41 -0.04 - 45 0 0 -10 36 50 16 8 38.5 16 107 69 -10 40 18 -10 33 23 -10 42 34 -10 31 7 -0.04 - 44 0 0 -10 53 58 16 8 40.2 17 107 68 -10 57 25 -10 50 31 -10 59 42 -10 48 15 -0.04 - 43 0 0 -11 10 49 16 8 42.1 19 107 67 -11 14 15 -11 7 22 -11 16 32 -11 5 6 -0.04 - 42 0 0 -11 27 21 16 8 44.1 20 107 66 -11 30 48 -11 23 55 -11 33 4 -11 21 39 -0.04 - 41 0 0 -11 43 36 16 8 46.2 21 106 65 -11 47 3 -11 40 10 -11 49 19 -11 37 54 -0.05 - 40 0 0 -11 59 33 16 8 48.4 22 106 64 -12 2 59 -11 56 7 -12 5 15 -11 53 52 -0.05 - 39 0 0 -12 15 12 16 8 50.7 23 106 63 -12 18 37 -12 11 46 -12 20 53 -12 9 31 -0.05 - 38 0 0 -12 30 32 16 8 53.1 24 106 62 -12 33 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-75 5 14 44 5 21 51 5 12 23 5 24 12 -0.04 98 0 0 5 41 42 16 19 30.2 17 248 -76 5 38 8 5 45 15 5 35 47 5 47 36 -0.04 99 0 0 6 5 2 16 19 32.0 16 248 -77 6 1 28 6 8 35 5 59 7 6 10 56 -0.04 100 0 0 6 28 16 16 19 33.7 15 248 -78 6 24 43 6 31 50 6 22 22 6 34 10 -0.04 101 0 0 6 51 26 16 19 35.3 14 248 -79 6 47 53 6 54 59 6 45 32 6 57 20 -0.04 102 0 0 7 14 29 16 19 36.8 13 248 -80 7 10 56 7 18 2 7 8 35 7 20 23 -0.04 103 0 0 7 37 26 16 19 38.1 12 249 -81 7 33 53 7 40 59 7 31 32 7 43 19 -0.04 104 0 0 8 0 16 16 19 39.4 11 249 -82 7 56 43 8 3 49 7 54 22 8 6 9 -0.04 105 0 0 8 22 58 16 19 40.5 10 249 -83 8 19 25 8 26 30 8 17 5 8 28 51 -0.04 106 0 0 8 45 32 16 19 41.5 9 249 -84 8 41 59 8 49 4 8 39 39 8 51 24 -0.04 107 0 0 9 7 57 16 19 42.4 8 249 -85 9 4 25 9 11 30 9 2 5 9 13 50 -0.04 108 0 0 9 30 13 16 19 43.1 6 249 -85 9 26 41 9 33 46 9 24 21 9 36 6 -0.03 109 0 0 9 52 20 16 19 43.8 5 249 -86 9 48 48 9 55 52 9 46 28 9 58 12 -0.03 110 0 0 10 14 17 16 19 44.3 4 250 -86 10 10 45 10 17 49 10 8 25 10 20 9 -0.03 111 0 0 10 36 3 16 19 44.7 3 250 -86 10 32 32 10 39 35 10 30 12 10 41 55 -0.02 112 0 0 10 57 39 16 19 45.0 2 250 -86 10 54 7 11 1 11 10 51 48 11 3 30 -0.01 113 0 0 11 19 3 16 19 45.2 1 250 -85 11 15 32 11 22 35 11 13 12 11 24 54 0.03 114 0 0 11 40 16 16 19 45.3 0 250 -85 11 36 44 11 43 47 11 34 25 11 46 6 0.47 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 354-177341 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 30 32.3057 DE: -19 14 43.508 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 30 32.3056 DE: -19 14 43.508 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 9.3 * B mag [mag]: 10.2 * Diameter [mas]: 0.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2012) Guo asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.011 distance from Earth [AU]: 1.57240 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#52 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): 0.022", 0.003", 77.38° remarks: * orbital elements for (2012)Guo : Mean anomaly = 6.2057941718 deg Arg. of pericenter = 36.6044786920 deg Long. of node = 277.0547457229 deg Inclination = 2.9056354291 deg Eccentricity = 0.1780050660 Semimajor axis = 2.3287700503 AU Perihelion dist = 1.9142371838 AU Mag: H = 13.55, G = 0.15 Epoch of elements : MJD 60593.67644446 TDT (2024 Oct 10.6764) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#522023Apr24,0.65,2024,10,10,16.234675,-0.009177,0.056148,10.423640,1.668101,0.005121,0.000796,0.000000,0.000000 29.7192,-19.1942,-66.81,-7.01,False UCAC4 354-177341,19.50897384,-19.2454188,10.19,9.31,8.83,0.2,0,,19.53308142,-19.1941647,7.97,8.00,0,0,0 2012,Guo,17.28,12.212,1.5724,0,0,4.116,9.33,,0.8,0 0,6.0182,2024,10,10,36.6045,277.0547,2.9056,0.17801,2.32877,1.91424,13.55,5.0,0.15 1.330,0.0217,0.0033,77,0.0035,Known errors,0.97,0,-1,-1 20241010_177341,60140.62 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:59 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org