IOTA/IOTA-ES occultation update for (2012) Guo / UCAC4 369-178738 event on 2024 Nov 12, 08:22 UT Visible from Summary ------- On 2024 Nov 12 UT, the 12.031 km diameter asteroid (2012) Guo will occult a 11.7 mag star in the constellation Capricornus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.97 mag to 17.70 mag (the magnitude of the asteroid) for at most 0.420 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: 98 * date and approx. time of event: 2024 Nov 12, 08:18 - 2024 Nov 12, 08:26 * geocentric midpoint of event [JD]: 2460626.84899433 * magnitude of target star: 11.73 * magnitude drop [mag]: 5.97 * estimated maximum duration [s]: 0.420 * Moon: 83 % sunlit, 55° distance * Sun: 76° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 0.34 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.003", 73°) * approx speed of asteroid's shadow [km/s]: 28.4507 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 369-178738 by 2012 Guo on 2024 Nov 12 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 40 0 0 - 5 37 41 8 18 51.3 0 106 73 - 5 41 7 - 5 34 15 - 5 43 26 - 5 31 55 .... 41 0 0 - 5 55 6 8 18 51.3 1 106 74 - 5 58 32 - 5 51 41 - 6 0 52 - 5 49 21 -0.01 42 0 0 - 6 12 15 8 18 51.5 2 106 75 - 6 15 40 - 6 8 49 - 6 17 59 - 6 6 30 -0.07 43 0 0 - 6 29 5 8 18 51.7 3 106 76 - 6 32 31 - 6 25 40 - 6 34 50 - 6 23 21 -0.09 44 0 0 - 6 45 38 8 18 51.9 4 106 77 - 6 49 3 - 6 42 13 - 6 51 22 - 6 39 54 -0.10 45 0 0 - 7 1 53 8 18 52.3 5 106 77 - 7 5 18 - 6 58 28 - 7 7 36 - 6 56 9 -0.11 46 0 0 - 7 17 49 8 18 52.7 6 106 78 - 7 21 13 - 7 14 25 - 7 23 32 - 7 12 6 -0.11 47 0 0 - 7 33 27 8 18 53.2 7 106 79 - 7 36 51 - 7 30 2 - 7 39 9 - 7 27 44 -0.12 48 0 0 - 7 48 45 8 18 53.8 9 105 79 - 7 52 9 - 7 45 21 - 7 54 27 - 7 43 3 -0.12 49 0 0 - 8 3 45 8 18 54.4 10 105 80 - 8 7 8 - 8 0 21 - 8 9 26 - 7 58 3 -0.12 50 0 0 - 8 18 25 8 18 55.1 11 105 80 - 8 21 48 - 8 15 1 - 8 24 6 - 8 12 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20 2 17 27 2 17 17 40 17 29 24 -0.13 -158 0 0 17 44 10 8 26 10.9 11 249 -64 17 40 41 17 47 40 17 38 18 17 50 2 -0.13 -157 0 0 18 4 35 8 26 11.6 10 249 -65 18 1 6 18 8 5 17 58 44 18 10 27 -0.13 -156 0 0 18 24 46 8 26 12.3 9 249 -66 18 21 17 18 28 16 18 18 55 18 30 38 -0.13 -155 0 0 18 44 43 8 26 12.8 8 250 -67 18 41 14 18 48 12 18 38 52 18 50 34 -0.13 -154 0 0 19 4 25 8 26 13.3 7 250 -68 19 0 56 19 7 54 18 58 35 19 10 16 -0.13 -153 0 0 19 23 53 8 26 13.8 6 250 -69 19 20 24 19 27 21 19 18 2 19 29 43 -0.13 -152 0 0 19 43 5 8 26 14.2 5 251 -70 19 39 36 19 46 33 19 37 15 19 48 55 -0.13 -151 0 0 20 2 2 8 26 14.5 4 251 -70 19 58 34 20 5 30 19 56 12 20 7 51 -0.13 -150 0 0 20 20 43 8 26 14.7 3 251 -71 20 17 15 20 24 11 20 14 54 20 26 32 -0.12 -149 0 0 20 39 8 8 26 14.9 2 252 -72 20 35 40 20 42 35 20 33 19 20 44 56 -0.12 -148 0 0 20 57 17 8 26 15.0 1 252 -73 20 53 49 21 0 44 20 51 29 21 3 5 -0.10 -147 0 0 21 15 9 8 26 15.0 0 253 -74 21 11 42 .. .. .. 21 9 22 .. .. .. 2.66 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 369-178738 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 30 41.2216 DE: -16 21 50.192 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 30 41.2215 DE: -16 21 50.192 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.7 * B mag [mag]: 12.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2012) Guo asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.009 distance from Earth [AU]: 1.92290 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): 0.018", 0.003", 72.991° remarks: * orbital elements for (2012)Guo : Mean anomaly = 15.2666202682 deg Arg. of pericenter = 36.6059818265 deg Long. of node = 277.0551334409 deg Inclination = 2.9056504578 deg Eccentricity = 0.1779830189 Semimajor axis = 2.3287121801 AU Perihelion dist = 1.9142409561 AU Mag: H = 13.55, G = 0.15 Epoch of elements : MJD 60626.34899409 TDT (2024 Nov 12.3490) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#522023Apr24,0.42,2024,11,12,8.375864,-0.034348,0.137606,15.588263,3.857098,0.004964,0.001315,-0.000001,0.000000 130.4220,-16.2813,50.41,-17.86,False UCAC4 369-178738,20.51145048,-16.3639420,12.01,11.73,11.58,0.0,0,,20.53469948,-16.2813159,5.97,5.67,0,0,0 2012,Guo,17.70,12.031,1.9229,0,0,4.951,17.64,,0.8,0 0,15.1698,2024,11,12,36.6060,277.0551,2.9057,0.17798,2.32871,1.91424,13.55,5.0,0.15 1.339,0.0180,0.0028,73,0.0029,Known errors,1.25,0,-1,-1 20241112_178738,60140.69 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org