Asteroid orbit identifying method based on observation angle data

A method of identification, a technology for asteroids, applied in directions such as measuring angles, measuring devices, mapping and navigation

Active Publication Date: 2015-07-22
NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for some small near-Earth objects, their angular velocity may be in the same order of magnitude as that of high-orbit satellites (or debris), or even smaller. Therefore, for the observation data

Method used

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  • Asteroid orbit identifying method based on observation angle data
  • Asteroid orbit identifying method based on observation angle data
  • Asteroid orbit identifying method based on observation angle data

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Select the observation data of asteroid numbered 53917 published on the website of the Small Planet Center (MPC) on February 20, 2014 (see Table 1), and take it as an example to identify, the steps are as follows.

[0075] In the following, YJD represents the number of days from January 1, 2000 in the observation epoch, lon represents right ascension, lat represents declination, and deg represents the unit of angle.

[0076] Table 1 Observation data of asteroid 53917

[0077] YJD

lon(deg)

lat(deg)

5163.74042

118.3713

32.24538

5163.74108

118.3711

32.24535

5163.75165

118.3695

32.24482

5163.75232

118.3694

32.2448

5163.7634

118.3677

32.24426

5163.76407

118.3676

32.24421

5163.77615

118.3657

32.24364

5163.77681

118.3656

32.24361

[0078] Step 1, calculate the rate of change of the observed quantity

[0079] The results are shown in T...

Embodiment 2

[0090] Select the asteroid numbered K06D14P published on the website of the Small Planet Center (MPC), and use the simulation software to simulate a period of observation data of the asteroid observed by an observatory in Beijing on February 9, 2014 (see Table 4). It is identified as an example, and the steps are as follows.

[0091] Table 4 Observation data of asteroid K06D14P

[0092] YJD

lon(deg)

lat(deg)

5155.15451

97.5240

-34.6077

5155.15799

97.5997

-34.5125

5155.16146

97.6751

-34.4175

5155.16493

97.7501

-34.3228

5155.16840

97.8247

-34.2283

5155.17188

97.8989

-34.1341

5155.17535

97.9727

-34.0402

5155.17882

98.0462

-33.9465

[0093] Step 1, calculate the rate of change of the observed quantity

[0094] The results are shown in Table 5. In the text, dlon represents the rate of change of right ascension, dlat represents the rate of...

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Abstract

The invention discloses an asteroid orbit identifying method based on observation angle data. The method comprises steps as follows: calculation of the change rate, that is, calculation of the observation angle data along with the time change rate; calculation of the angular velocity; screening of the angular velocity: the angular velocity of a current observation arc section is compared with a given threshold, and whether data of the section belong to an asteroid or a man-made earth satellite or are undetermined is judged preliminarily; correlation judgment: observation forecast is performed by using orbit elements of the catalogued man-made earth satellite, theoretically calculated values and measured values of all observation epochs are compared, if the error is small enough, the arc section is judged to belong to the man-made earth satellite, and otherwise, the arc section belongs to the asteroid. The method is convenient and easy to implement, can be applied to multiple research fields related to astronomical observation as well as quick recognition of near-earth asteroids, and wins precious early warning and emergency time for follow-up work.

Description

technical field [0001] The invention relates to the field of space target monitoring and early warning, and more specifically relates to an asteroid orbit identification method based on angle measurement data, which is used to determine whether the orbit of a target celestial body belongs to an asteroid or an artificial earth satellite. Background technique [0002] When using ground-based optical telescopes for observation, the images captured include natural celestial bodies such as galaxies, stars, major planets in the solar system, asteroids, and comets, as well as artificial celestial bodies such as artificial earth satellites and space debris. Through the image, we can obtain the direction information of the celestial body, which is usually described by the two angular measurements of right ascension and declination. Generally speaking, various objects in the image can be distinguished by angular velocity (hereinafter referred to as angular velocity): in the inertial c...

Claims

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Application Information

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IPC IPC(8): G01C1/00G01P3/00
CPCG01C1/00G01P3/00
Inventor 杨志涛刘静
Owner NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI
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