IOTA/IOTA-ES occultation update for (2328) Robeson / UCAC4 479-011689 event on 2024 Dec 29, 23:38 UT Visible from Summary ------- On 2024 Dec 29 UT, the 12.223 km diameter asteroid (2328) Robeson will occult a 11.7 mag star in the constellation Orion for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.36 mag to 16.03 mag (the magnitude of the asteroid) for at most 1.330 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: 98 * date and approx. time of event: 2024 Dec 29, 23:26 - 2024 Dec 29, 23:49 * geocentric midpoint of event [JD]: 2460674.48482083 * magnitude of target star: 11.69 * magnitude drop [mag]: 4.36 * estimated maximum duration [s]: 1.330 * Moon: 1 % sunlit, 157° distance * Sun: 156° 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]: +/- 2.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.029, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.029", 0.004", 90°) * approx speed of asteroid's shadow [km/s]: 9.1671 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 479-011689 by 2328 Robeson on 2024 Dec 29 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 -103 0 0 - 5 7 19 23 49 33.6 0 84 17 - 5 3 56 - 5 10 42 - 5 1 37 - 5 13 1 .... -102 0 0 - 5 1 23 23 49 33.4 1 84 16 - 4 57 59 - 5 4 46 - 4 55 41 - 5 7 4 0.06 -101 0 0 - 4 55 32 23 49 33.1 2 84 15 - 4 52 9 - 4 58 56 - 4 49 51 - 5 1 14 0.12 -100 0 0 - 4 49 48 23 49 32.6 3 84 14 - 4 46 25 - 4 53 11 - 4 44 7 - 4 55 30 0.14 - 99 0 0 - 4 44 10 23 49 31.8 4 84 13 - 4 40 47 - 4 47 33 - 4 38 29 - 4 49 52 0.15 - 98 0 0 - 4 38 39 23 49 30.8 5 84 12 - 4 35 16 - 4 42 2 - 4 32 57 - 4 44 20 0.16 - 97 0 0 - 4 33 14 23 49 29.7 6 84 11 - 4 29 50 - 4 36 37 - 4 27 32 - 4 38 55 0.16 - 96 0 0 - 4 27 55 23 49 28.3 7 84 10 - 4 24 32 - 4 31 18 - 4 22 14 - 4 33 36 0.16 - 95 0 0 - 4 22 43 23 49 26.7 8 84 9 - 4 19 20 - 4 26 6 - 4 17 2 - 4 28 24 0.17 - 94 0 0 - 4 17 37 23 49 24.8 9 84 8 - 4 14 14 - 4 21 0 - 4 11 56 - 4 23 19 0.17 - 93 0 0 - 4 12 39 23 49 22.8 10 83 7 - 4 9 16 - 4 16 2 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0 0 -13 22 53 23 27 8.4 15 280 -24 -13 19 29 -13 26 16 -13 17 10 -13 28 35 0.19 66 0 0 -13 29 57 23 27 5.3 14 279 -23 -13 26 33 -13 33 20 -13 24 14 -13 35 39 0.19 67 0 0 -13 36 57 23 27 2.5 13 279 -22 -13 33 33 -13 40 21 -13 31 15 -13 42 39 0.19 68 0 0 -13 43 54 23 26 59.9 12 279 -21 -13 40 30 -13 47 18 -13 38 12 -13 49 36 0.19 69 0 0 -13 50 47 23 26 57.4 11 279 -21 -13 47 24 -13 54 11 -13 45 5 -13 56 30 0.19 70 0 0 -13 57 37 23 26 55.2 10 279 -20 -13 54 13 -14 1 1 -13 51 55 -14 3 19 0.19 71 0 0 -14 4 23 23 26 53.2 9 278 -19 -14 0 59 -14 7 46 -13 58 41 -14 10 5 0.19 72 0 0 -14 11 4 23 26 51.3 8 278 -18 -14 7 41 -14 14 28 -14 5 22 -14 16 47 0.19 73 0 0 -14 17 42 23 26 49.7 7 278 -17 -14 14 19 -14 21 6 -14 12 0 -14 23 24 0.19 74 0 0 -14 24 16 23 26 48.2 6 278 -16 -14 20 52 -14 27 39 -14 18 34 -14 29 58 0.19 75 0 0 -14 30 45 23 26 47.0 5 277 -15 -14 27 21 -14 34 8 -14 25 3 -14 36 27 0.19 76 0 0 -14 37 9 23 26 46.0 5 277 -14 -14 33 46 -14 40 33 -14 31 27 -14 42 51 0.19 77 0 0 -14 43 29 23 26 45.1 4 277 -13 -14 40 6 -14 46 53 -14 37 47 -14 49 11 0.20 78 0 0 -14 49 44 23 26 44.5 3 277 -13 -14 46 21 -14 53 8 -14 44 3 -14 55 26 0.20 79 0 0 -14 55 55 23 26 44.0 2 276 -12 -14 52 31 -14 59 18 -14 50 13 -15 1 36 0.21 80 0 0 -15 2 0 23 26 43.8 1 276 -11 -14 58 37 -15 5 23 -14 56 18 -15 7 42 0.26 Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.8 Data for the target star ------------------------ * name: UCAC4 479-011689 * constellation : Orion * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 05 29 42.3524 DE: +05 38 47.082 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 05 29 42.3523 DE: +05 38 47.082 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.7 * B mag [mag]: 12.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2328) Robeson asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.013 distance from Earth [AU]: 1.26400 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#49 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): 0.029", 0.004", 89.709° remarks: * orbital elements for (2328)Robeson : Mean anomaly = 302.3272114916 deg Arg. of pericenter = 340.4303260552 deg Long. of node = 182.0848281085 deg Inclination = 10.0092083189 deg Eccentricity = 0.1452257923 Semimajor axis = 2.3422720661 AU Perihelion dist = 2.0021137496 AU Mag: H = 13.15, G = 0.15 Epoch of elements : MJD 60673.98482083 TDT (2024 Dec 29.9848) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492023Apr24,1.33,2024,12,29,23.635700,-0.015165,-0.174708,-5.154634,0.449117,0.001508,0.001739,0.000001,0.000000 -10.6828,5.6665,-173.91,-23.15,False UCAC4 479-011689,5.49509788,5.6464119,12.03,11.69,11.51,0.0,0,,5.51772753,5.6664711,4.36,4.10,0,0,0 2328,Robeson,16.03,12.223,1.2640,0,0,-2.401,3.13,,1.0,0 0,302.0564,2024,12,29,340.4303,182.0848,10.0092,0.14523,2.34227,2.00211,13.15,5.0,0.15 1.340,0.0293,0.0037,90,0.0045,Known errors,1.81,0,-1,-1 20241229_011689,60140.76 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 18:15 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org