IOTA/IOTA-ES occultation update for (856) Backlunda / TYC 5712-00569-1 event on 2023 Jun 17, 21:28 UT Visible from Europe Summary ------- On 2023 Jun 17 UT, the 45.2 km diameter asteroid (856) Backlunda will occult a 10.8 mag star in the constellation Aquila for observers along a path across Europe. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.19 mag to 13.89 mag (the magnitude of the asteroid) for at most 4.940 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 Jun 17, 21:23 - 2023 Jun 17, 21:32 * geocentric midpoint of event [JD]: 2460113.39462630 * magnitude of target star: 10.76 * magnitude drop [mag]: 3.19 * estimated maximum duration [s]: 4.940 * Moon: 0 % sunlit, 150° distance * Sun: 155° distance * rough path description: Europe The occultation path -------------------- * approximate projected width [km]: 141 * 1 sigma uncertainty interval [path widths]: +/- 0.21 * 1 sigma uncertainty interval [seconds]: +/- 1.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.003", 97°) * approx speed of asteroid's shadow [km/s]: 9.1536 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5712-00569-1 by 856 Backlunda on 2023 Jun 17 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 ' " Longitude Longitude Longitude Longitude 26 31 13 76 0 0 21 24 39.2 0 146 10 ... .. .. 29 37 29 ... .. .. 30 50 58 .... 28 50 46 75 0 0 21 24 39.9 2 148 8 25 53 35 31 36 17 24 35 49 32 42 9 1.89 30 34 23 74 0 0 21 24 41.5 3 149 7 27 55 25 33 4 26 26 46 18 34 4 31 2.40 31 51 9 73 0 0 21 24 43.8 4 151 6 29 25 58 34 9 12 28 23 15 35 4 42 2.61 32 47 3 72 0 0 21 24 46.8 5 152 5 30 32 42 34 55 28 29 34 55 35 47 15 2.72 33 26 9 71 0 0 21 24 50.4 6 152 4 31 20 32 35 26 40 30 26 42 36 15 24 2.79 33 51 25 70 0 0 21 24 54.6 7 153 3 31 53 1 35 45 22 31 2 23 36 31 31 2.84 34 5 3 69 0 0 21 24 59.5 8 153 2 32 12 39 35 53 27 31 24 41 36 37 25 2.88 34 8 42 68 0 0 21 25 4.9 9 153 1 32 21 22 35 52 24 31 35 37 36 34 29 2.90 34 3 37 67 0 0 21 25 11.0 9 153 0 32 20 36 35 43 18 31 36 44 36 23 47 -2.93 33 50 50 66 0 0 21 25 17.6 10 152 -1 32 11 28 35 27 3 31 29 12 36 6 9 -2.94 33 31 5 65 0 0 21 25 24.9 11 152 -2 31 54 51 35 4 21 31 13 57 35 42 16 -2.96 33 5 0 64 0 0 21 25 32.7 12 152 -3 31 31 26 34 35 44 30 51 40 35 12 38 -2.97 32 33 3 63 0 0 21 25 41.2 13 151 -4 31 1 43 34 1 38 30 22 54 34 37 40 -2.98 31 55 36 62 0 0 21 25 50.2 13 150 -5 30 26 7 33 22 23 29 48 5 33 57 41 -2.99 31 12 53 61 0 0 21 25 59.9 14 149 -6 29 44 54 32 38 11 29 7 30 33 12 53 -2.99 30 25 5 60 0 0 21 26 10.3 15 149 -6 28 58 16 31 49 14 28 21 22 32 23 27 -3.00 29 32 19 59 0 0 21 26 21.2 15 148 -7 28 6 21 30 55 35 27 29 47 31 29 27 -3.00 28 34 36 58 0 0 21 26 32.9 16 147 -8 27 9 8 29 57 18 26 32 46 30 30 54 -3.00 27 31 52 57 0 0 21 26 45.2 17 145 -9 26 6 35 28 54 19 25 30 15 29 27 47 -3.01 26 23 59 56 0 0 21 26 58.2 17 144 -10 24 58 31 27 46 30 24 22 4 28 19 58 -3.01 25 10 45 55 0 0 21 27 12.0 17 143 -11 23 44 42 26 33 40 23 7 57 27 7 16 -3.01 23 51 49 54 0 0 21 27 26.5 18 142 -12 22 24 44 25 15 32 21 47 29 25 49 24 -3.01 22 26 42 53 0 0 21 27 41.8 18 140 -13 20 58 4 23 51 41 20 20 3 24 26 1 -3.01 20 54 48 52 0 0 21 27 58.0 18 138 -13 19 23 57 22 21 35 18 44 52 22 56 34 -3.02 19 15 13 51 0 0 21 28 15.1 18 137 -14 17 41 18 20 44 30 17 0 46 21 20 23 -3.02 17 26 43 50 0 0 21 28 33.2 18 135 -15 15 48 37 18 59 24 15 6 2 19 36 30 -3.02 15 27 32 49 0 0 21 28 52.4 18 133 -15 13 43 38 17 4 51 12 58 11 17 43 37 -3.03 13 15 2 48 0 0 21 29 12.9 18 131 -15 11 22 48 14 58 50 10 33 9 15 39 52 -3.04 Latitude Latitude Latitude Latitude 13 0 0 47 53 37 21 29 15.2 18 131 -15 48 40 35 47 8 51 49 0 48 46 50 50 -3.01 12 0 0 47 28 58 21 29 24.2 17 130 -16 48 15 6 46 44 56 48 34 56 46 27 12 -3.02 11 0 0 47 5 38 21 29 32.9 17 129 -16 47 51 0 46 22 16 48 10 30 46 4 47 -3.02 10 0 0 46 43 35 21 29 41.5 17 128 -16 47 28 15 46 0 49 47 47 26 45 43 35 -3.03 9 0 0 46 22 47 21 29 49.8 17 127 -16 47 6 49 45 40 35 47 25 42 45 23 33 -3.03 8 0 0 46 3 13 21 29 57.9 16 126 -16 46 46 41 45 21 31 47 5 18 45 4 40 -3.03 7 0 0 45 44 51 21 30 5.8 16 125 -16 46 27 48 45 3 36 46 46 11 44 46 56 -3.03 6 0 0 45 27 42 21 30 13.5 15 124 -15 46 10 10 44 46 52 46 28 19 44 30 21 -3.03 5 0 0 45 11 42 21 30 20.9 15 123 -15 45 53 45 44 31 16 46 11 43 44 14 54 -3.04 4 0 0 44 56 53 21 30 28.1 15 123 -15 45 38 32 44 16 47 45 56 20 44 0 33 -3.04 3 0 0 44 43 13 21 30 35.1 14 122 -15 45 24 31 44 3 25 45 42 9 43 47 18 -3.04 2 0 0 44 30 41 21 30 41.8 14 121 -15 45 11 41 43 51 10 45 29 11 43 35 9 -3.05 1 0 0 44 19 18 21 30 48.2 13 120 -15 45 0 1 43 40 1 45 17 24 43 24 6 -3.05 0 0 0 44 9 2 21 30 54.4 13 119 -14 44 49 31 43 29 58 45 6 47 43 14 8 -3.06 - 1 0 0 43 59 54 21 31 0.3 12 119 -14 44 40 10 43 21 1 44 57 21 43 5 15 -3.06 - 2 0 0 43 51 52 21 31 6.0 12 118 -14 44 31 59 43 13 9 44 49 4 42 57 27 -3.07 - 3 0 0 43 44 58 21 31 11.4 11 117 -13 44 24 56 43 6 22 44 41 58 42 50 43 -3.08 - 4 0 0 43 39 10 21 31 16.5 10 116 -13 44 19 1 43 0 41 44 36 0 42 45 4 -3.08 - 5 0 0 43 34 29 21 31 21.3 10 116 -13 44 14 15 42 56 4 44 31 11 42 40 29 -3.09 - 6 0 0 43 30 55 21 31 25.8 9 115 -12 44 10 37 42 52 33 44 27 32 42 36 59 -3.10 - 7 0 0 43 28 28 21 31 30.0 8 114 -12 44 8 8 42 50 7 44 25 3 42 34 34 -3.11 - 8 0 0 43 27 7 21 31 33.9 8 113 -11 44 6 48 42 48 47 44 23 42 42 33 14 -3.13 - 9 0 0 43 26 54 21 31 37.5 7 113 -11 44 6 36 42 48 32 44 23 31 42 32 59 -3.14 - 10 0 0 43 27 49 21 31 40.8 7 112 -10 44 7 34 42 49 24 44 24 31 42 33 49 -3.16 - 11 0 0 43 29 51 21 31 43.8 6 111 -10 44 9 41 42 51 21 44 26 40 42 35 44 -3.18 - 12 0 0 43 33 1 21 31 46.5 5 111 -9 44 12 58 42 54 25 44 30 0 42 38 46 -3.20 - 13 0 0 43 37 19 21 31 48.8 4 110 -9 44 17 25 42 58 36 44 34 31 42 42 54 -3.23 - 14 0 0 43 42 47 21 31 50.8 4 109 -8 44 23 3 43 3 54 44 40 14 42 48 8 -3.27 - 15 0 0 43 49 24 21 31 52.4 3 108 -8 44 29 53 43 10 20 44 47 9 42 54 30 -3.34 - 16 0 0 43 57 12 21 31 53.7 2 108 -7 44 37 55 43 17 55 44 55 17 43 1 59 -3.43 - 17 0 0 44 6 10 21 31 54.6 2 107 -6 44 47 10 43 26 39 45 4 40 43 10 38 -3.62 - 18 0 0 44 16 21 21 31 55.2 1 106 -6 44 57 40 43 36 32 45 15 18 43 20 25 -4.12 - 19 0 0 44 27 44 21 31 55.4 0 106 -5 .. .. .. 43 47 37 .. .. .. 43 31 22 -12.23 Uncertainty in time = +/- 2 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: TYC 5712-00569-1 * constellation : Aquila * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 13 17.5961 DE: -11 10 32.026 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 13 17.5962 DE: -11 10 32.026 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 10.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (856) Backlunda asteroid class: approx. diameter [km]: 45 approx. diameter ["]: 0.045 distance from Earth [AU]: 1.39000 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#94 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): 0.017", 0.003", 96.716° remarks: * orbital elements for (856)Backlunda : Mean anomaly = 66.7596798476 deg Arg. of pericenter = 72.6278735665 deg Long. of node = 125.5326094557 deg Inclination = 14.3267602814 deg Eccentricity = 0.1191723564 Semimajor axis = 2.4350426892 AU Perihelion dist = 2.1448529139 AU Mag: H = 10.66, G = 0.15 Epoch of elements : MJD 60112.89451389 TDT (2023 Jun 17.8945) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#942023Apr24,4.94,2023,6,17,21.471031,-0.418351,0.849816,-4.635771,-2.280939,-0.001899,-0.001221,0.000001,0.000000 60.7119,-11.1361,-141.81,23.39,False TYC 5712-00569-1,19.22155446,-11.1755629,0.00,10.76,0.00,0.0,0,,19.24341771,-11.1360922,3.19,0.00,0,0,0 856,Backlunda,13.89,45.2,1.3900,0,0,-1.993,-14.43,,2.6,0 0,66.5277,2023,6,17,72.6279,125.5326,14.3268,0.11917,2.43504,2.14485,10.66,5.0,0.15 1.208,0.0167,0.0026,97,0.0093,Known errors,-1.00,-1,-1,-1 20230617_0569-1,60063.20 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:41 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org