IOTA/IOTA-ES occultation update for (1620) Geographos / TYC 2404-00938-1 event on 2023 Apr 17, 03:53 UT Visible from N Canada Summary ------- On 2023 Apr 17 UT, the 2.87849535878483 km diameter asteroid (1620) Geographos will occult a 11.6 mag star in the constellation Auriga for observers along a path across N Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.08 mag to 18.71 mag (the magnitude of the asteroid) for at most 0.100 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: 85 * date and approx. time of event: 2023 Apr 17, 03:51 - 2023 Apr 17, 03:55 * geocentric midpoint of event [JD]: 2460051.66218016 * magnitude of target star: 11.63 * magnitude drop [mag]: 7.08 * estimated maximum duration [s]: 0.100 * Moon: 11 % sunlit, 97° distance * Sun: 59° distance * rough path description: N Canada The occultation path -------------------- * approximate projected width [km]: 6 * 1 sigma uncertainty interval [path widths]: +/- 0.59 * 1 sigma uncertainty interval [seconds]: +/- 0.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.003, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.004", 0.001", 111°) * approx speed of asteroid's shadow [km/s]: 29.1378 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2404-00938-1 by 1620 Geographos on 2023 Apr 17 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 Alt E. Longitude Latitude U.T. Alt Az Alt Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude 35 6 11 55 53 4 3 51 51.4 0 29 10 35 44 0 56 30 28 ... .. .. .. .. .. 36 12 25 56 57 18 ... .. .. .. .. .. .... 37 57 19 59 8 29 3 51 52.7 4 31 12 38 7 34 59 16 28 37 46 46 59 0 9 38 19 23 59 25 33 37 33 42 58 49 41 -1.18 39 13 22 60 43 41 3 51 53.9 6 32 13 39 21 31 60 49 19 39 5 7 60 37 56 39 31 8 60 55 55 38 55 6 60 30 52 -1.72 40 9 28 61 58 12 3 51 55.1 7 33 13 40 16 43 62 2 46 40 2 10 61 53 34 40 25 19 62 8 8 39 53 22 61 47 55 -1.81 40 54 57 63 1 53 3 51 56.4 8 34 13 41 1 41 63 5 49 40 48 11 62 57 55 41 9 43 63 10 27 40 40 2 62 53 6 -1.86 41 33 28 63 58 39 3 51 57.6 9 34 13 41 39 53 64 2 8 41 27 1 63 55 7 41 47 33 64 6 16 41 19 17 63 50 52 -1.88 42 6 53 64 50 28 3 51 58.9 10 35 14 42 13 6 64 53 38 42 0 40 64 47 17 42 20 30 64 57 24 41 53 12 64 43 25 -1.89 42 36 20 65 38 34 3 52 0.1 11 36 14 42 42 24 65 41 29 42 30 15 65 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72 29 20 59 25 58 - 72 43 32 59 29 0 - 72 24 0 59 24 50 -1.97 - 72 11 26 58 59 27 3 54 50.0 17 300 -20 - 72 15 53 59 0 26 - 72 6 58 58 58 28 - 72 21 13 59 1 36 - 72 1 37 58 57 16 -1.97 - 71 48 16 58 31 29 3 54 51.3 17 300 -20 - 71 52 45 58 32 30 - 71 43 48 58 30 27 - 71 58 6 58 33 43 - 71 38 26 58 29 13 -1.98 - 71 24 15 58 2 58 3 54 52.5 16 301 -21 - 71 28 45 58 4 2 - 71 19 45 58 1 54 - 71 34 7 58 5 18 - 71 14 21 58 0 36 -1.98 - 70 59 18 57 33 52 3 54 53.8 16 301 -21 - 71 3 50 57 34 59 - 70 54 46 57 32 45 - 71 9 14 57 36 19 - 70 49 20 57 31 24 -1.98 - 70 33 20 57 4 8 3 54 55.0 15 302 -22 - 70 37 54 57 5 18 - 70 28 46 57 2 58 - 70 43 21 57 6 41 - 70 23 18 57 1 33 -1.98 - 70 6 17 56 33 41 3 54 56.2 15 302 -23 - 70 10 54 56 34 55 - 70 1 40 56 32 27 - 70 16 24 56 36 22 - 69 56 8 56 30 58 -1.99 - 69 38 1 56 2 27 3 54 57.5 14 303 -23 - 69 42 41 56 3 44 - 69 33 21 56 1 9 - 69 48 15 56 5 16 - 69 27 45 55 59 35 -1.99 - 69 8 26 55 30 20 3 54 58.7 14 303 -24 - 69 13 9 55 31 41 - 69 3 41 55 28 57 - 69 18 48 55 33 18 - 68 58 0 55 27 18 -2.00 - 68 37 20 54 57 13 3 55 0.0 13 304 -24 - 68 42 9 54 58 39 - 68 32 31 54 55 46 - 68 47 53 55 0 22 - 68 26 44 54 54 0 -2.00 - 68 4 33 54 22 58 3 55 1.2 13 304 -25 - 68 9 28 54 24 30 - 67 59 38 54 21 25 - 68 15 19 54 26 20 - 67 53 44 54 19 33 -2.01 - 67 29 51 53 47 24 3 55 2.4 12 305 -26 - 67 34 52 53 49 3 - 67 24 49 53 45 44 - 67 40 52 53 51 0 - 67 18 46 53 43 44 -2.01 - 66 52 53 53 10 19 3 55 3.7 12 305 -26 - 66 58 4 53 12 5 - 66 47 42 53 8 31 - 67 4 13 53 14 11 - 66 41 28 53 6 21 -2.02 - 66 13 17 52 31 24 3 55 4.9 11 306 -27 - 66 18 38 52 33 20 - 66 7 54 52 29 27 - 66 25 1 52 35 37 - 66 1 27 52 27 6 -2.03 - 65 30 27 51 50 16 3 55 6.2 10 306 -28 - 65 36 2 51 52 23 - 65 24 50 51 48 7 - 65 42 41 51 54 54 - 65 18 5 51 45 32 -2.05 - 64 43 35 51 6 21 3 55 7.4 9 307 -28 - 64 49 29 51 8 42 - 64 37 40 51 3 57 - 64 56 30 51 11 30 - 64 30 32 51 1 4 -2.06 - 63 51 30 50 18 47 3 55 8.6 8 308 -29 - 63 57 49 50 21 29 - 63 45 8 50 16 4 - 64 5 19 50 24 39 - 63 37 28 50 12 46 -2.09 - 62 52 11 49 26 13 3 55 9.9 7 309 -30 - 62 59 8 49 29 22 - 62 45 11 49 23 1 - 63 7 20 49 33 4 - 62 36 43 49 19 7 -2.13 - 61 41 59 48 26 2 3 55 11.1 6 310 -31 - 61 49 56 48 29 55 - 61 33 55 48 22 3 - 61 59 18 48 34 28 - 61 24 6 48 17 11 -2.20 - 60 12 8 47 12 8 3 55 12.4 4 311 -33 - 60 22 10 47 17 31 - 60 1 49 47 6 33 - 60 33 50 47 23 43 - 59 49 11 46 59 39 -2.36 - 57 43 47 45 17 23 3 55 13.6 2 312 -34 - 58 3 20 45 29 27 - 57 21 3 45 3 5 - 58 24 2 45 42 0 - 56 45 33 44 40 10 -3.42 Uncertainty in time = +/- 0 secs Prediction of 2023 Mar 30.0 Data for the target star ------------------------ * name: TYC 2404-00938-1 * constellation : Auriga * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 05 36 19.1881 DE: +30 01 18.240 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 05 36 19.1881 DE: +30 01 18.240 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.6 * B mag [mag]: 12.7 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1620) Geographos asteroid class: approx. diameter [km]: 3 approx. diameter ["]: 0.002 distance from Earth [AU]: 1.67530 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#739 date of fit: 2023 Mar 17 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): 0.004", 0.001", 111.004° remarks: * orbital elements for (1620)Geographos : Mean anomaly = 260.3291876144 deg Arg. of pericenter = 276.9571834814 deg Long. of node = 337.1723343368 deg Inclination = 13.3363086465 deg Eccentricity = 0.3355368099 Semimajor axis = 1.2456940142 AU Perihelion dist = 0.8277178185 AU Mag: H = 15.32, G = 0.15 Epoch of elements : MJD 60051.16218692 TDT (2023 Apr 17.1622) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#7392023Mar17,0.10,2023,4,17,3.892324,0.143544,0.872659,16.226355,-2.680051,0.003369,0.000374,-0.000001,0.000000 -178.9659,30.0372,121.54,10.37,False TYC 2404-00938-1,5.60533010,30.0217336,12.67,11.63,11.07,0.1,0,,5.62974214,30.0372375,7.08,7.19,0,0,0 1620,Geographos,18.71,3.0,1.6753,0,0,6.560,-14.08,,0.2,0 0,260.2142,2023,4,17,276.9572,337.1723,13.3363,0.33554,1.24569,0.82772,15.32,5.0,0.15 1.598,0.0037,0.0013,111,0.0015,Known errors,-1.00,-1,-1,-1 20230417_0938-1,60032.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Mar 29, 23:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org