IOTA/IOTA-ES occultation update for (12684) 1984 DQ / TYC 4943-00873-1 event on 2024 Dec 28, 06:28 UT Visible from Summary ------- On 2024 Dec 28 UT, the 9.354 km diameter asteroid (12684) 1984 DQ will occult a 10.2 mag star in the constellation Virgo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 8.12 mag to 18.29 mag (the magnitude of the asteroid) for at most 0.460 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 28, 06:22 - 2024 Dec 28, 06:33 * geocentric midpoint of event [JD]: 2460672.76959534 * magnitude of target star: 10.17 * magnitude drop [mag]: 8.12 * estimated maximum duration [s]: 0.460 * Moon: 7 % sunlit, 61° distance * Sun: 91° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 9 * 1 sigma uncertainty interval [path widths]: +/- 0.34 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.020, +/- 0.014) * 1 sigma uncertainty ellipse (major, minor, PA): (0.024", 0.002", 124°) * approx speed of asteroid's shadow [km/s]: 20.1530 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4943-00873-1 by 12684 1984 DQ on 2024 Dec 28 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 - 94 0 0 44 11 21 6 22 59.9 1 96 -69 44 8 47 44 13 54 44 7 2 44 15 40 .... - 93 0 0 44 6 40 6 23 0.0 1 97 -69 44 4 6 44 9 14 44 2 21 44 10 59 -0.07 - 92 0 0 44 1 31 6 23 0.1 2 97 -69 43 58 57 44 4 5 43 57 12 44 5 50 -0.09 - 91 0 0 43 55 54 6 23 0.2 3 98 -69 43 53 20 43 58 28 43 51 34 44 0 14 -0.10 - 90 0 0 43 49 49 6 23 0.5 3 99 -69 43 47 14 43 52 23 43 45 29 43 54 9 -0.10 - 89 0 0 43 43 15 6 23 0.7 4 99 -69 43 40 40 43 45 50 43 38 55 43 47 36 -0.11 - 88 0 0 43 36 13 6 23 1.1 5 100 -69 43 33 38 43 38 48 43 31 52 43 40 34 -0.11 - 87 0 0 43 28 41 6 23 1.4 6 101 -69 43 26 6 43 31 17 43 24 20 43 33 3 -0.11 - 86 0 0 43 20 41 6 23 1.9 6 101 -68 43 18 6 43 23 17 43 16 19 43 25 3 -0.11 - 85 0 0 43 12 12 6 23 2.4 7 102 -68 43 9 36 43 14 48 43 7 49 43 16 34 -0.11 - 84 0 0 43 3 13 6 23 2.9 8 103 -68 43 0 37 43 5 49 42 58 50 43 7 36 -0.11 - 83 0 0 42 53 44 6 23 3.5 9 104 -68 42 51 8 42 56 21 42 49 21 42 58 8 -0.11 - 82 0 0 42 43 46 6 23 4.2 9 104 -68 42 41 9 42 46 23 42 39 22 42 48 10 -0.11 - 81 0 0 42 33 17 6 23 4.9 10 105 -67 42 30 40 42 35 54 42 28 52 42 37 42 -0.11 - 80 0 0 42 22 18 6 23 5.7 11 106 -67 42 19 40 42 24 55 42 17 52 42 26 43 -0.12 - 79 0 0 42 10 48 6 23 6.5 12 106 -67 42 8 10 42 13 26 42 6 22 42 15 14 -0.12 - 78 0 0 41 58 47 6 23 7.4 12 107 -66 41 56 8 42 1 25 41 54 20 42 3 14 -0.12 - 77 0 0 41 46 14 6 23 8.4 13 108 -66 41 43 35 41 48 53 41 41 47 41 50 42 -0.12 - 76 0 0 41 33 10 6 23 9.4 14 108 -66 41 30 31 41 35 50 41 28 42 41 37 39 -0.12 - 75 0 0 41 19 35 6 23 10.5 15 109 -65 41 16 55 41 22 15 41 15 5 41 24 4 -0.12 - 74 0 0 41 5 27 6 23 11.6 16 110 -65 41 2 46 41 8 7 41 0 57 41 9 57 -0.12 - 73 0 0 40 50 46 6 23 12.9 16 110 -64 40 48 5 40 53 27 40 46 15 40 55 17 -0.12 - 72 0 0 40 35 33 6 23 14.2 17 111 -64 40 32 51 40 38 14 40 31 1 40 40 4 -0.12 - 71 0 0 40 19 46 6 23 15.5 18 112 -63 40 17 4 40 22 28 40 15 13 40 24 19 -0.12 - 70 0 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-29 33 49 -29 25 12 -0.17 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.8 Data for the target star ------------------------ * name: TYC 4943-00873-1 * constellation : Virgo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 12 16 19.5493 DE: -03 44 04.236 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 12 16 19.5496 DE: -03 44 04.238 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 10.2 * B mag [mag]: 10.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (12684) 1984 DQ asteroid class: approx. diameter [km]: 9 approx. diameter ["]: 0.007 distance from Earth [AU]: 1.92560 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#39 date of fit: 2023 Apr 27 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): 0.024", 0.002", 124.099° remarks: * orbital elements for (12684)1984 DQ : Mean anomaly = 318.1271442918 deg Arg. of pericenter = 252.3986556677 deg Long. of node = 330.2491693977 deg Inclination = 11.0138464245 deg Eccentricity = 0.2333827527 Semimajor axis = 2.5459094820 AU Perihelion dist = 1.9517381191 AU Mag: H = 13.97, G = 0.15 Epoch of elements : MJD 60672.26959562 TDT (2024 Dec 28.2696) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#392023Apr27,0.46,2024,12,28,6.470288,0.076841,0.103645,9.113405,-6.806959,-0.005217,0.002262,0.000000,0.000000 -9.8746,-3.8733,83.36,-23.25,False TYC 4943-00873-1,12.27209701,-3.7345099,10.35,10.17,10.07,0.0,0,,12.29348556,-3.8732782,8.13,7.77,0,0,0 12684,1984 DQ,18.29,9.354,1.9256,0,0,2.782,-31.09,,0.8,0 0,318.0617,2024,12,28,252.3987,330.2492,11.0138,0.23338,2.54591,1.95174,13.97,5.0,0.15 1.342,0.0243,0.0020,124,0.0023,Known errors,1.09,0,-1,-1 20241228_0873-1,60140.76 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 18:12 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org