IOTA/IOTA-ES occultation update for (2012) Guo / UCAC4 355-187287 event on 2024 Oct 13, 11:00 UT Visible from Summary ------- On 2024 Oct 13 UT, the 12.031 km diameter asteroid (2012) Guo will occult a 12.0 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 5.38 mag to 17.33 mag (the magnitude of the asteroid) for at most 0.610 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, 10:55 - 2024 Oct 13, 11:04 * geocentric midpoint of event [JD]: 2460596.95841763 * magnitude of target star: 11.96 * magnitude drop [mag]: 5.38 * estimated maximum duration [s]: 0.610 * Moon: 78 % sunlit, 33° distance * Sun: 92° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 15 * 1 sigma uncertainty interval [path widths]: +/- 0.34 * 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): (0.021", 0.003", 77°) * approx speed of asteroid's shadow [km/s]: 19.5758 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 355-187287 by 2012 Guo 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 - 1 0 0 -44 29 32 10 55 50.5 1 116 52 -44 34 11 -44 24 53 -44 37 18 -44 21 46 .... 0 0 0 -44 51 16 10 55 50.6 1 116 52 -44 55 55 -44 46 38 -44 59 2 -44 43 31 0.70 1 0 0 -45 12 49 10 55 50.8 2 115 52 -45 17 27 -45 8 10 -45 20 34 -45 5 4 0.73 2 0 0 -45 34 8 10 55 51.1 3 114 51 -45 38 47 -45 29 30 -45 41 53 -45 26 24 0.74 3 0 0 -45 55 15 10 55 51.4 4 114 51 -45 59 53 -45 50 37 -46 2 59 -45 47 31 0.75 4 0 0 -46 16 7 10 55 51.8 5 113 51 -46 20 45 -46 11 30 -46 23 51 -46 8 24 0.76 5 0 0 -46 36 46 10 55 52.3 5 112 51 -46 41 23 -46 32 9 -46 44 29 -46 29 3 0.76 6 0 0 -46 57 10 10 55 52.9 6 111 51 -47 1 47 -46 52 33 -47 4 53 -46 49 28 0.77 7 0 0 -47 17 20 10 55 53.5 7 111 51 -47 21 57 -47 12 43 -47 25 2 -47 9 38 0.77 8 0 0 -47 37 15 10 55 54.2 8 110 50 -47 41 51 -47 32 38 -47 44 56 -47 29 34 0.77 9 0 0 -47 56 54 10 55 55.0 8 109 50 -48 1 30 -47 52 18 -48 4 35 -47 49 14 0.77 10 0 0 -48 16 18 10 55 55.8 9 108 50 -48 20 54 -48 11 43 -48 23 59 -48 8 38 0.77 11 0 0 -48 35 26 10 55 56.7 10 108 50 -48 40 1 -48 30 51 -48 43 6 -48 27 47 0.77 12 0 0 -48 54 18 10 55 57.6 11 107 49 -48 58 53 -48 49 44 -49 1 57 -48 46 40 0.78 13 0 0 -49 12 54 10 55 58.6 11 106 49 -49 17 29 -49 8 20 -49 20 33 -49 5 17 0.78 14 0 0 -49 31 14 10 55 59.7 12 105 49 -49 35 48 -49 26 40 -49 38 51 -49 23 37 0.78 15 0 0 -49 49 17 10 56 0.8 13 104 48 -49 53 50 -49 44 44 -49 56 54 -49 41 41 0.78 16 0 0 -50 7 3 10 56 1.9 13 104 48 -50 11 36 -50 2 30 -50 14 39 -49 59 28 0.78 17 0 0 -50 24 32 10 56 3.1 14 103 48 -50 29 5 -50 20 0 -50 32 7 -50 16 58 0.78 18 0 0 -50 41 44 10 56 4.4 15 102 47 -50 46 16 -50 37 13 -50 49 19 -50 34 11 0.78 19 0 0 -50 58 39 10 56 5.7 15 101 47 -51 3 11 -50 54 8 -51 6 13 -50 51 7 0.78 20 0 0 -51 15 17 10 56 7.1 16 100 46 -51 19 48 -51 10 46 -51 22 49 -51 7 45 0.78 21 0 0 -51 31 37 10 56 8.5 17 100 46 -51 36 8 -51 27 7 -51 39 9 -51 24 6 0.78 22 0 0 -51 47 40 10 56 9.9 17 99 46 -51 52 10 -51 43 10 -51 55 11 -51 40 10 0.78 23 0 0 -52 3 25 10 56 11.4 18 98 45 -52 7 54 -51 58 56 -52 10 55 -51 55 56 0.78 24 0 0 -52 18 53 10 56 13.0 19 97 45 -52 23 21 -52 14 24 -52 26 22 -52 11 25 0.78 25 0 0 -52 34 3 10 56 14.5 19 96 44 -52 38 31 -52 29 35 -52 41 31 -52 26 36 0.78 26 0 0 -52 48 55 10 56 16.2 20 95 44 -52 53 22 -52 44 28 -52 56 22 -52 41 29 0.78 27 0 0 -53 3 29 10 56 17.8 21 94 44 -53 7 56 -52 59 3 -53 10 55 -52 56 4 0.78 28 0 0 -53 17 46 10 56 19.5 21 94 43 -53 22 13 -53 13 20 -53 25 11 -53 10 22 0.78 29 0 0 -53 31 45 10 56 21.2 22 93 43 -53 36 11 -53 27 20 -53 39 9 -53 24 22 0.78 30 0 0 -53 45 27 10 56 22.9 22 92 42 -53 49 52 -53 41 2 -53 52 50 -53 38 4 0.78 31 0 0 -53 58 50 10 56 24.7 23 91 42 -54 3 15 -53 54 26 -54 6 12 -53 51 29 0.78 32 0 0 -54 11 56 10 56 26.5 24 90 41 -54 16 20 -54 7 32 -54 19 17 -54 4 36 0.78 33 0 0 -54 24 44 10 56 28.4 24 89 41 -54 29 7 -54 20 21 -54 32 4 -54 17 25 0.78 34 0 0 -54 37 14 10 56 30.3 25 88 40 -54 41 37 -54 32 52 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56.5 21 261 -46 -35 39 3 -35 29 47 -35 42 10 -35 26 41 0.81 -176 0 0 -35 9 55 11 3 58.8 20 260 -46 -35 14 33 -35 5 17 -35 17 40 -35 2 12 0.81 -175 0 0 -34 45 28 11 4 1.1 19 260 -47 -34 50 5 -34 40 50 -34 53 12 -34 37 45 0.81 -174 0 0 -34 21 3 11 4 3.2 18 259 -47 -34 25 40 -34 16 26 -34 28 46 -34 13 21 0.81 -173 0 0 -33 56 42 11 4 5.3 17 258 -48 -34 1 19 -33 52 5 -34 4 24 -33 49 0 0.82 -172 0 0 -33 32 25 11 4 7.2 16 258 -48 -33 37 1 -33 27 48 -33 40 7 -33 24 44 0.82 -171 0 0 -33 8 12 11 4 9.1 16 257 -49 -33 12 49 -33 3 37 -33 15 54 -33 0 32 0.82 -170 0 0 -32 44 6 11 4 10.9 15 257 -49 -32 48 42 -32 39 30 -32 51 46 -32 36 26 0.82 -169 0 0 -32 20 5 11 4 12.5 14 256 -50 -32 24 41 -32 15 30 -32 27 45 -32 12 26 0.83 -168 0 0 -31 56 12 11 4 14.1 13 255 -50 -32 0 47 -31 51 38 -32 3 51 -31 48 34 0.83 -167 0 0 -31 32 26 11 4 15.5 12 255 -50 -31 37 1 -31 27 52 -31 40 5 -31 24 49 0.83 -166 0 0 -31 8 49 11 4 16.9 11 254 -51 -31 13 23 -31 4 15 -31 16 27 -31 1 12 0.84 -165 0 0 -30 45 21 11 4 18.1 10 254 -51 -30 49 54 -30 40 48 -30 52 57 -30 37 45 0.84 -164 0 0 -30 22 2 11 4 19.3 9 253 -51 -30 26 35 -30 17 29 -30 29 38 -30 14 27 0.85 -163 0 0 -29 58 54 11 4 20.3 8 253 -52 -30 3 26 -29 54 22 -30 6 29 -29 51 20 0.85 -162 0 0 -29 35 56 11 4 21.2 7 252 -52 -29 40 28 -29 31 25 -29 43 30 -29 28 23 0.86 -161 0 0 -29 13 11 11 4 22.1 6 252 -52 -29 17 42 -29 8 40 -29 20 44 -29 5 38 0.87 -160 0 0 -28 50 37 11 4 22.7 5 251 -52 -28 55 8 -28 46 7 -28 58 9 -28 43 6 0.89 -159 0 0 -28 28 16 11 4 23.3 4 251 -52 -28 32 47 -28 23 47 -28 35 48 -28 20 46 0.91 -158 0 0 -28 6 9 11 4 23.8 3 250 -52 -28 10 39 -28 1 40 -28 13 40 -27 58 40 0.95 -157 0 0 -27 44 16 11 4 24.2 2 250 -52 -27 48 45 -27 39 47 -27 51 46 -27 36 47 1.01 -156 0 0 -27 22 37 11 4 24.4 1 249 -52 -27 27 6 -27 18 9 -27 30 6 -27 15 10 1.16 -155 0 0 -27 1 14 11 4 24.5 1 249 -52 -27 5 42 -26 56 46 -27 8 41 -26 53 47 1.86 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 355-187287 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 35 10.7629 DE: -19 04 04.976 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 35 10.7629 DE: -19 04 04.977 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 12.0 * B mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2012) Guo asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.010 distance from Earth [AU]: 1.60160 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): 0.021", 0.003", 77.011° remarks: * orbital elements for (2012)Guo : Mean anomaly = 6.9772636183 deg Arg. of pericenter = 36.6046177049 deg Long. of node = 277.0547693536 deg Inclination = 2.9056365779 deg Eccentricity = 0.1780033656 Semimajor axis = 2.3287654396 AU Perihelion dist = 1.9142373537 AU Mag: H = 13.55, G = 0.15 Epoch of elements : MJD 60596.45841734 TDT (2024 Oct 13.4584) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#522023Apr24,0.61,2024,10,13,11.002023,0.100546,-0.604361,10.898931,1.815616,0.005112,0.000839,0.000000,0.000000 106.6263,-19.0142,11.50,-8.05,False UCAC4 355-187287,19.58632307,-19.0680489,12.41,11.96,11.72,0.0,0,K,19.61037432,-19.0142476,5.37,5.17,0,0,0 2012,Guo,17.33,12.031,1.6016,0,0,4.220,9.97,,0.8,0 0,6.8501,2024,10,13,36.6046,277.0548,2.9056,0.17800,2.32877,1.91424,13.55,5.0,0.15 1.335,0.0213,0.0032,77,0.0035,Known errors,0.93,0,-1,-1 20241013_187287,60140.63 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:08 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org