IOTA/IOTA-ES occultation update for (2012) Guo / UCAC4 389-135070 event on 2024 Dec 11, 12:17 UT Visible from Summary ------- On 2024 Dec 11 UT, the 12.022 km diameter asteroid (2012) Guo will occult a 11.9 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 6.02 mag to 17.95 mag (the magnitude of the asteroid) for at most 0.330 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 Dec 11, 12:15 - 2024 Dec 11, 12:20 * geocentric midpoint of event [JD]: 2460656.01248525 * magnitude of target star: 11.93 * magnitude drop [mag]: 6.02 * estimated maximum duration [s]: 0.330 * Moon: 81 % sunlit, 67° distance * Sun: 61° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 14 * 1 sigma uncertainty interval [path widths]: +/- 0.33 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.002", 70°) * approx speed of asteroid's shadow [km/s]: 35.9874 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 389-135070 by 2012 Guo on 2024 Dec 11 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 - 45 0 0 -48 22 16 12 15 27.9 0 108 50 -48 26 17 -48 18 15 -48 28 58 -48 15 35 .... - 44 0 0 -48 35 16 12 15 27.9 1 107 50 -48 39 16 -48 31 15 -48 41 56 -48 28 36 0.52 - 43 0 0 -48 47 57 12 15 28.0 2 106 51 -48 51 58 -48 43 57 -48 54 37 -48 41 18 0.56 - 42 0 0 -49 0 21 12 15 28.1 2 106 51 -49 4 21 -48 56 21 -49 7 0 -48 53 42 0.57 - 41 0 0 -49 12 27 12 15 28.2 3 105 52 -49 16 26 -49 8 28 -49 19 5 -49 5 49 0.58 - 40 0 0 -49 24 14 12 15 28.3 4 104 52 -49 28 13 -49 20 16 -49 30 52 -49 17 37 0.59 - 39 0 0 -49 35 44 12 15 28.5 5 103 53 -49 39 43 -49 31 46 -49 42 21 -49 29 8 0.59 - 38 0 0 -49 46 56 12 15 28.7 5 103 53 -49 50 54 -49 42 58 -49 53 32 -49 40 20 0.59 - 37 0 0 -49 57 50 12 15 29.0 6 102 54 -50 1 48 -49 53 53 -50 4 25 -49 51 15 0.60 - 36 0 0 -50 8 26 12 15 29.2 7 101 54 -50 12 23 -50 4 29 -50 15 1 -50 1 52 0.60 - 35 0 0 -50 18 44 12 15 29.5 7 100 54 -50 22 41 -50 14 48 -50 25 19 -50 12 11 0.60 - 34 0 0 -50 28 45 12 15 29.8 8 100 55 -50 32 41 -50 24 49 -50 35 18 -50 22 12 0.60 - 33 0 0 -50 38 28 12 15 30.2 8 99 55 -50 42 24 -50 34 32 -50 45 1 -50 31 56 0.60 - 32 0 0 -50 47 53 12 15 30.6 9 98 55 -50 51 49 -50 43 58 -50 54 25 -50 41 22 0.60 - 31 0 0 -50 57 1 12 15 30.9 10 97 56 -51 0 56 -50 53 6 -51 3 32 -50 50 30 0.60 - 30 0 0 -51 5 51 12 15 31.4 10 96 56 -51 9 46 -51 1 56 -51 12 22 -50 59 21 0.60 - 29 0 0 -51 14 23 12 15 31.8 11 96 56 -51 18 18 -51 10 29 -51 20 54 -51 7 54 0.60 - 28 0 0 -51 22 39 12 15 32.3 12 95 57 -51 26 33 -51 18 45 -51 29 8 -51 16 9 0.60 - 27 0 0 -51 30 36 12 15 32.7 12 94 57 -51 34 30 -51 26 43 -51 37 5 -51 24 8 0.60 - 26 0 0 -51 38 17 12 15 33.3 13 93 57 -51 42 10 -51 34 23 -51 44 45 -51 31 49 0.60 - 25 0 0 -51 45 40 12 15 33.8 14 92 58 -51 49 33 -51 41 47 -51 52 7 -51 39 12 0.61 - 24 0 0 -51 52 45 12 15 34.3 14 92 58 -51 56 38 -51 48 53 -51 59 13 -51 46 18 0.61 - 23 0 0 -51 59 34 12 15 34.9 15 91 58 -52 3 26 -51 55 42 -52 6 1 -51 53 8 0.61 - 22 0 0 -52 6 5 12 15 35.5 15 90 58 -52 9 57 -52 2 13 -52 12 32 -51 59 39 0.61 - 21 0 0 -52 12 20 12 15 36.1 16 89 59 -52 16 12 -52 8 28 -52 18 46 -52 5 54 0.61 - 20 0 0 -52 18 17 12 15 36.8 17 88 59 -52 22 9 -52 14 26 -52 24 42 -52 11 52 0.61 - 19 0 0 -52 23 57 12 15 37.4 17 88 59 -52 27 49 -52 20 6 -52 30 22 -52 17 33 0.61 - 18 0 0 -52 29 21 12 15 38.1 18 87 59 -52 33 12 -52 25 30 -52 35 45 -52 22 57 0.61 - 17 0 0 -52 34 27 12 15 38.8 19 86 59 -52 38 18 -52 30 37 -52 40 51 -52 28 3 0.61 - 16 0 0 -52 39 17 12 15 39.5 19 85 59 -52 43 7 -52 35 26 -52 45 41 -52 32 53 0.61 - 15 0 0 -52 43 50 12 15 40.3 20 84 59 -52 47 40 -52 39 59 -52 50 13 -52 37 27 0.61 - 14 0 0 -52 48 6 12 15 41.0 20 83 60 -52 51 56 -52 44 16 -52 54 29 -52 41 43 0.61 - 13 0 0 -52 52 5 12 15 41.8 21 82 60 -52 55 55 -52 48 15 -52 58 28 -52 45 43 0.61 - 12 0 0 -52 55 47 12 15 42.6 22 82 60 -52 59 37 -52 51 58 -53 2 10 -52 49 26 0.61 - 11 0 0 -52 59 13 12 15 43.5 22 81 60 -53 3 3 -52 55 24 -53 5 36 -52 52 52 0.61 - 10 0 0 -53 2 23 12 15 44.3 23 80 60 -53 6 12 -52 58 34 -53 8 45 -52 56 1 0.61 - 9 0 0 -53 5 15 12 15 45.2 23 79 60 -53 9 5 -53 1 26 -53 11 37 -52 58 54 0.61 - 8 0 0 -53 7 52 12 15 46.0 24 78 60 -53 11 41 -53 4 3 -53 14 13 -53 1 31 0.61 - 7 0 0 -53 10 11 12 15 46.9 24 77 60 -53 14 0 -53 6 22 -53 16 32 -53 3 50 0.61 - 6 0 0 -53 12 14 12 15 47.9 25 76 60 -53 16 3 -53 8 26 -53 18 35 -53 5 54 0.61 - 5 0 0 -53 14 1 12 15 48.8 26 76 60 -53 17 50 -53 10 12 -53 20 22 -53 7 40 0.61 - 4 0 0 -53 15 31 12 15 49.7 26 75 60 -53 19 20 -53 11 42 -53 21 52 -53 9 11 0.61 - 3 0 0 -53 16 45 12 15 50.7 27 74 60 -53 20 33 -53 12 56 -53 23 5 -53 10 24 0.61 - 2 0 0 -53 17 42 12 15 51.7 27 73 60 -53 21 30 -53 13 53 -53 24 2 -53 11 22 0.61 - 1 0 0 -53 18 22 12 15 52.7 28 72 60 -53 22 11 -53 14 34 -53 24 43 -53 12 2 0.61 0 0 0 -53 18 47 12 15 53.8 28 71 59 -53 22 35 -53 14 58 -53 25 7 -53 12 27 0.61 1 0 0 -53 18 54 12 15 54.8 29 70 59 -53 22 43 -53 15 6 -53 25 15 -53 12 34 0.61 2 0 0 -53 18 46 12 15 55.9 30 69 59 -53 22 34 -53 14 57 -53 25 6 -53 12 26 0.61 3 0 0 -53 18 20 12 15 57.0 30 68 59 -53 22 9 -53 14 32 -53 24 41 -53 12 0 0.61 4 0 0 -53 17 39 12 15 58.1 31 67 59 -53 21 27 -53 13 50 -53 23 59 -53 11 19 0.61 5 0 0 -53 16 41 12 15 59.2 31 66 59 -53 20 29 -53 12 52 -53 23 1 -53 10 21 0.61 6 0 0 -53 15 26 12 16 0.3 32 65 59 -53 19 15 -53 11 38 -53 21 47 -53 9 6 0.61 7 0 0 -53 13 55 12 16 1.5 32 65 58 -53 17 44 -53 10 6 -53 20 16 -53 7 35 0.61 8 0 0 -53 12 7 12 16 2.7 33 64 58 -53 15 56 -53 8 19 -53 18 28 -53 5 47 0.61 9 0 0 -53 10 3 12 16 3.9 33 63 58 -53 13 52 -53 6 14 -53 16 24 -53 3 42 0.61 10 0 0 -53 7 42 12 16 5.1 34 62 58 -53 11 31 -53 3 53 -53 14 3 -53 1 21 0.61 11 0 0 -53 5 5 12 16 6.4 35 61 57 -53 8 54 -53 1 16 -53 11 26 -52 58 44 0.61 12 0 0 -53 2 11 12 16 7.6 35 60 57 -53 6 0 -52 58 21 -53 8 32 -52 55 49 0.61 13 0 0 -52 59 0 12 16 8.9 36 59 57 -53 2 49 -52 55 10 -53 5 22 -52 52 38 0.61 14 0 0 -52 55 32 12 16 10.2 36 58 57 -52 59 22 -52 51 43 -53 1 54 -52 49 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Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 389-135070 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 21 30 09.5687 DE: -12 14 30.800 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 21 30 09.5686 DE: -12 14 30.801 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.9 * 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 ["]: 0.007 distance from Earth [AU]: 2.23500 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): 0.016", 0.002", 69.574° remarks: * orbital elements for (2012)Guo : Mean anomaly = 23.3557415051 deg Arg. of pericenter = 36.6063879592 deg Long. of node = 277.0555001568 deg Inclination = 2.9056597301 deg Eccentricity = 0.1779598627 Semimajor axis = 2.3286532983 AU Perihelion dist = 1.9142464771 AU Mag: H = 13.55, G = 0.15 Epoch of elements : MJD 60655.51248505 TDT (2024 Dec 11.5125) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#522023Apr24,0.33,2024,12,11,12.299646,0.161449,-0.495312,19.309630,6.303026,0.004451,0.001604,-0.000001,0.000000 57.6744,-12.1337,-6.12,-23.06,False UCAC4 389-135070,21.50265801,-12.2418888,11.98,11.93,11.90,0.0,0,,21.52499047,-12.1336833,1.66,3.21,1,0,1 2012,Guo,17.95,12.022,2.2350,0,0,5.181,24.81,,0.8,0 0,23.2136,2024,12,11,36.6064,277.0555,2.9057,0.17796,2.32865,1.91425,13.55,5.0,0.15 1.332,0.0157,0.0024,70,0.0025,Known errors,1.61,0,-1,-1 20241211_135070,60140.74 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org