IOTA/IOTA-ES occultation update for (2724) Orlov / UCAC4 542-033708 event on 2024 Dec 13, 15:55 UT Visible from Summary ------- On 2024 Dec 13 UT, the 20.662 km diameter asteroid (2724) Orlov will occult a 10.6 mag star in the constellation Gemini for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.95 mag to 16.55 mag (the magnitude of the asteroid) for at most 1.580 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: 95 * date and approx. time of event: 2024 Dec 13, 15:49 - 2024 Dec 13, 16:01 * geocentric midpoint of event [JD]: 2460658.16358400 * magnitude of target star: 10.60 * magnitude drop [mag]: 5.95 * estimated maximum duration [s]: 1.580 * Moon: 96 % sunlit, 43° distance * Sun: 159° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 27 * 1 sigma uncertainty interval [path widths]: +/- 0.43 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.019, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.005", 95°) * approx speed of asteroid's shadow [km/s]: 13.1071 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 542-033708 by 2724 Orlov on 2024 Dec 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 63 0 0 -34 16 44 16 1 40.6 0 68 -12 -34 8 40 -34 24 48 -34 1 43 -34 31 48 .... 64 0 0 -33 56 33 16 1 40.4 1 67 -13 -33 48 31 -34 4 37 -33 41 35 -34 11 36 0.46 65 0 0 -33 36 33 16 1 40.1 2 66 -14 -33 28 31 -33 44 36 -33 21 35 -33 51 34 0.63 66 0 0 -33 16 42 16 1 39.7 3 66 -15 -33 8 41 -33 24 44 -33 1 46 -33 31 42 0.70 67 0 0 -32 57 2 16 1 39.0 4 65 -16 -32 49 2 -33 5 4 -32 42 8 -33 12 0 0.74 68 0 0 -32 37 33 16 1 38.3 5 65 -17 -32 29 34 -32 45 34 -32 22 41 -32 52 30 0.77 69 0 0 -32 18 16 16 1 37.3 6 64 -17 -32 10 18 -32 26 16 -32 3 25 -32 33 11 0.79 70 0 0 -31 59 11 16 1 36.2 7 64 -18 -31 51 13 -32 7 10 -31 44 22 -32 14 4 0.80 71 0 0 -31 40 18 16 1 35.0 8 63 -19 -31 32 22 -31 48 16 -31 25 31 -31 55 10 0.81 72 0 0 -31 21 39 16 1 33.5 9 63 -20 -31 13 43 -31 29 36 -31 6 53 -31 36 29 0.82 73 0 0 -31 3 13 16 1 32.0 9 62 -21 -30 55 18 -31 11 9 -30 48 28 -31 18 1 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Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 542-033708 * constellation : Gemini * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 06 49 43.6670 DE: +18 12 19.742 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 06 49 43.6671 DE: +18 12 19.742 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.6 * B mag [mag]: 10.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2724) Orlov asteroid class: approx. diameter [km]: 21 approx. diameter ["]: 0.012 distance from Earth [AU]: 2.31170 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#52 date of fit: 2023 Feb 11 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): 0.019", 0.005", 95.363° remarks: * orbital elements for (2724)Orlov : Mean anomaly = 150.9444526243 deg Arg. of pericenter = 145.4805591159 deg Long. of node = 153.3566018616 deg Inclination = 3.9806827283 deg Eccentricity = 0.1233008909 Semimajor axis = 2.9272460887 AU Perihelion dist = 2.5663140380 AU Mag: H = 11.69, G = 0.15 Epoch of elements : MJD 60657.66358688 TDT (2024 Dec 13.6636) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#522023Feb11,1.58,2024,12,13,15.926016,-0.052916,-0.652748,-7.374069,0.594903,-0.001998,0.000642,0.000001,0.000000 141.0855,18.1772,-60.27,-23.21,False UCAC4 542-033708,6.82879640,18.2054840,10.87,10.60,10.45,0.0,0,,6.85344417,18.1771612,5.95,5.65,0,0,0 2724,Orlov,16.55,20.662,2.3117,0,0,-1.968,2.26,,1.6,0 0,150.8139,2024,12,13,145.4806,153.3566,3.9807,0.12330,2.92725,2.56631,11.69,5.0,0.15 1.432,0.0193,0.0053,95,0.0053,Known errors,0.93,0,-1,-1 20241213_033708,60140.74 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:43 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org