IOTA/IOTA-ES occultation update for (1437) Diomedes / UCAC4 616-041516 event on 2023 Jan 10, 16:49 UT Visible from Japan, Russia, SW Asia Summary ------- On 2023 Jan 10 UT, the 144.1 km diameter asteroid (1437) Diomedes will occult a 12.4 mag star in the constellation Gemini for observers along a path across Japan, Russia, SW Asia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.69 mag to 15.04 mag (the magnitude of the asteroid) for at most 8.060 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: 2023 Jan 10, 16:43 - 2023 Jan 10, 16:55 * geocentric midpoint of event [JD]: 2459955.20088338 * magnitude of target star: 12.44 * magnitude drop [mag]: 2.69 * estimated maximum duration [s]: 8.060 * Moon: 88 % sunlit, 41° distance * Sun: 169° distance * rough path description: Japan, Russia, SW Asia The occultation path -------------------- * approximate projected width [km]: 149 * 1 sigma uncertainty interval [path widths]: +/- 0.22 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.010) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.004", 119°) * approx speed of asteroid's shadow [km/s]: 17.8773 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 616-041516 by 1437 Diomedes on 2023 Jan 10 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 15 0 0 9 51 43 16 55 0.3 0 57 -1 10 40 19 9 3 19 11 1 26 .. .. .. .... 16 0 0 10 31 18 16 55 0.2 2 57 -2 11 19 59 9 42 50 11 41 8 9 21 55 -0.28 17 0 0 11 10 59 16 54 59.8 3 57 -3 11 59 44 10 22 28 12 20 55 10 1 30 -0.27 18 0 0 11 50 46 16 54 59.4 4 57 -4 12 39 34 11 2 10 13 0 46 10 41 11 -0.27 19 0 0 12 30 35 16 54 58.8 5 57 -5 13 19 27 11 41 57 13 40 41 11 20 56 -0.27 20 0 0 13 10 27 16 54 58.0 6 58 -7 13 59 22 12 21 45 14 20 37 12 0 44 -0.27 21 0 0 13 50 20 16 54 57.1 8 58 -8 14 39 17 13 1 35 15 0 33 12 40 33 -0.26 22 0 0 14 30 11 16 54 56.0 9 58 -9 15 19 11 13 41 25 15 40 28 13 20 22 -0.26 23 0 0 15 10 1 16 54 54.8 10 58 -10 15 59 2 14 21 13 16 20 20 14 0 9 -0.26 24 0 0 15 49 47 16 54 53.4 11 59 -11 16 38 49 15 0 57 17 0 8 14 39 53 -0.26 25 0 0 16 29 28 16 54 51.9 12 59 -12 17 18 31 15 40 38 17 39 50 15 19 33 -0.26 26 0 0 17 9 3 16 54 50.2 13 59 -13 17 58 7 16 20 12 18 19 26 15 59 7 -0.26 27 0 0 17 48 30 16 54 48.4 15 59 -14 18 37 34 16 59 39 18 58 54 16 38 34 -0.26 28 0 0 18 27 49 16 54 46.5 16 60 -16 19 16 52 17 38 58 19 38 12 17 17 53 -0.26 29 0 0 19 6 57 16 54 44.4 17 60 -17 19 56 0 18 18 7 20 17 19 17 57 2 -0.26 30 0 0 19 45 54 16 54 42.2 18 61 -18 20 34 56 18 57 5 20 56 14 18 36 1 -0.26 31 0 0 20 24 38 16 54 39.9 19 61 -19 21 13 39 19 35 51 21 34 57 19 14 47 -0.26 32 0 0 21 3 9 16 54 37.4 20 61 -20 21 52 8 20 14 24 22 13 24 19 53 21 -0.26 33 0 0 21 41 24 16 54 34.9 21 62 -21 22 30 21 20 52 41 22 51 37 20 31 39 -0.26 34 0 0 22 19 24 16 54 32.2 22 62 -22 23 8 18 21 30 43 23 29 32 21 9 42 -0.26 35 0 0 22 57 6 16 54 29.4 23 63 -23 23 45 57 22 8 28 24 7 10 21 47 29 -0.26 36 0 0 23 34 30 16 54 26.5 25 63 -24 24 23 17 22 45 56 24 44 29 22 24 58 -0.26 37 0 0 24 11 34 16 54 23.5 26 63 -25 25 0 18 23 23 4 25 21 28 23 2 7 -0.26 38 0 0 24 48 19 16 54 20.4 27 64 -26 25 36 58 23 59 52 25 58 7 23 38 58 -0.26 39 0 0 25 24 42 16 54 17.2 28 64 -27 26 13 17 24 36 20 26 34 24 24 15 27 -0.26 40 0 0 26 0 43 16 54 13.9 29 65 -28 26 49 13 25 12 26 27 10 18 24 51 35 -0.26 41 0 0 26 36 21 16 54 10.5 30 65 -29 27 24 47 25 48 9 27 45 49 25 27 20 -0.26 42 0 0 27 11 36 16 54 7.0 31 66 -30 27 59 56 26 23 29 28 20 56 26 2 43 -0.27 43 0 0 27 46 26 16 54 3.5 32 67 -31 28 34 40 26 58 25 28 55 38 26 37 41 -0.27 44 0 0 28 20 51 16 53 59.9 33 67 -32 29 8 59 27 32 56 29 29 54 27 12 14 -0.27 45 0 0 28 54 50 16 53 56.2 34 68 -33 29 42 52 28 7 1 30 3 45 27 46 22 -0.27 46 0 0 29 28 23 16 53 52.4 35 68 -34 30 16 19 28 40 40 30 37 8 28 20 4 -0.27 47 0 0 30 1 29 16 53 48.6 36 69 -35 30 49 18 29 13 53 31 10 4 28 53 20 -0.27 48 0 0 30 34 7 16 53 44.7 37 70 -36 31 21 49 29 46 38 31 42 32 29 26 8 -0.27 49 0 0 31 6 18 16 53 40.8 38 70 -37 31 53 52 30 18 55 32 14 32 29 58 28 -0.27 50 0 0 31 37 59 16 53 36.8 39 71 -37 32 25 26 30 50 45 32 46 3 30 30 21 -0.27 51 0 0 32 9 12 16 53 32.7 40 72 -38 32 56 32 31 22 5 33 17 5 31 1 44 -0.27 52 0 0 32 39 56 16 53 28.7 41 72 -39 33 27 8 31 52 56 33 47 38 31 32 39 -0.27 53 0 0 33 10 10 16 53 24.5 42 73 -40 33 57 14 32 23 18 34 17 41 32 3 4 -0.27 54 0 0 33 39 55 16 53 20.4 43 74 -41 34 26 50 32 53 11 34 47 13 32 33 0 -0.27 55 0 0 34 9 9 16 53 16.2 44 75 -42 34 55 56 33 22 33 35 16 16 33 2 26 -0.27 56 0 0 34 37 53 16 53 11.9 45 75 -42 35 24 32 33 51 26 35 44 48 33 31 22 -0.27 57 0 0 35 6 7 16 53 7.6 45 76 -43 35 52 37 34 19 48 36 12 50 33 59 48 -0.27 58 0 0 35 33 50 16 53 3.3 46 77 -44 36 20 12 34 47 39 36 40 20 34 27 43 -0.27 59 0 0 36 1 2 16 52 59.0 47 78 -45 36 47 15 35 15 0 37 7 20 34 55 7 -0.27 60 0 0 36 27 43 16 52 54.7 48 79 -46 37 13 48 35 41 50 37 33 49 35 22 1 -0.27 61 0 0 36 53 54 16 52 50.3 49 80 -46 37 39 50 36 8 9 37 59 47 35 48 24 -0.27 62 0 0 37 19 34 16 52 45.9 50 81 -47 38 5 21 36 33 58 38 25 14 36 14 16 -0.27 63 0 0 37 44 43 16 52 41.5 51 82 -48 38 30 21 36 59 15 38 50 10 36 39 38 -0.27 64 0 0 38 9 20 16 52 37.1 51 83 -48 38 54 50 37 24 2 39 14 35 37 4 28 -0.27 65 0 0 38 33 27 16 52 32.7 52 84 -49 39 18 48 37 48 18 39 38 30 37 28 48 -0.27 66 0 0 38 57 4 16 52 28.3 53 85 -50 39 42 15 38 12 3 40 1 53 37 52 36 -0.27 67 0 0 39 20 9 16 52 23.9 54 86 -50 40 5 12 38 35 17 40 24 46 38 15 55 -0.27 68 0 0 39 42 44 16 52 19.4 55 87 -51 40 27 38 38 58 1 40 47 8 38 38 42 -0.27 69 0 0 40 4 48 16 52 15.0 55 88 -52 40 49 33 39 20 14 41 9 0 39 0 59 -0.27 70 0 0 40 26 22 16 52 10.5 56 89 -52 41 10 58 39 41 56 41 30 21 39 22 45 -0.27 71 0 0 40 47 26 16 52 6.1 57 90 -53 41 31 53 40 3 9 41 51 12 39 44 1 -0.27 72 0 0 41 8 0 16 52 1.6 58 91 -54 41 52 18 40 23 51 42 11 33 40 4 47 -0.27 73 0 0 41 28 3 16 51 57.2 58 93 -54 42 12 13 40 44 3 42 31 24 40 25 3 -0.27 74 0 0 41 47 37 16 51 52.8 59 94 -55 42 31 39 41 3 45 42 50 46 40 44 49 -0.27 75 0 0 42 6 41 16 51 48.3 60 95 -55 42 50 35 41 22 58 43 9 38 41 4 5 -0.27 76 0 0 42 25 16 16 51 43.9 60 96 -56 43 9 1 41 41 41 43 28 1 41 22 52 -0.27 77 0 0 42 43 22 16 51 39.5 61 98 -56 43 26 59 41 59 55 43 45 55 41 41 9 -0.27 78 0 0 43 0 59 16 51 35.0 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Uncertainty in time = +/- 3 secs Prediction of 2022 Dec 1.1 Data for the target star ------------------------ * name: UCAC4 616-041516 * constellation : Gemini * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 07 36 40.4113 DE: +33 03 33.008 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 07 36 40.4113 DE: +33 03 33.008 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1437) Diomedes asteroid class: approx. diameter [km]: 144 approx. diameter ["]: 0.049 distance from Earth [AU]: 4.02900 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#86 date of fit: 2022 Nov 22 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): 0.018", 0.004", 119.23° remarks: * orbital elements for (1437)Diomedes : Mean anomaly = 22.0917325773 deg Arg. of pericenter = 128.9196428687 deg Long. of node = 315.7906685239 deg Inclination = 20.4712879182 deg Eccentricity = 0.0457125234 Semimajor axis = 5.2162761469 AU Perihelion dist = 4.9778270017 AU Mag: H = 8.26, G = 0.15 Epoch of elements : MJD 59954.70069445 TDT (2023 Jan 10.7007) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#862022Nov22,8.06,2023,1,10,16.821201,-0.018402,0.264264,-10.066089,-0.700956,-0.000291,-0.001180,0.000001,0.000000 112.2750,33.0075,-70.45,-21.92,False UCAC4 616-041516,7.61122537,33.0591688,0.00,12.44,0.00,0.0,0,,7.63623397,33.0074534,2.70,0.00,0,0,0 1437,Diomedes,15.04,144.1,4.0290,0,0,-1.746,-1.53,,7.8,0 0,22.0338,2023,1,10,128.9196,315.7907,20.4713,0.04571,5.21628,4.97783,8.27,5.0,0.15 1.217,0.0183,0.0043,119,0.0107,Known errors,-1.00,-1,-1,-1 20230110_041516,59914.09 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Dec 01, 02:11 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org