Asteroids

1979XB help

Last update: 2026-07-30 11:21 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.651

Aphelion (Q)

4.483

Eccentricity (e)

0.746

Inclination (i)

25.3

deg

Orbit period (P)

1502.0

Earth MOID

0.00510

U parameter

9.0

Next Earth close approach

Date

2033-05-31

Nominal distance (from Earth center)

0.15043

22504674

Maximum Brightness

17.4

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

19.1

mag

Diameter

400 - 900*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

1979-12-11

Observatory

Siding Spring Observatory

ORBIT VISUALISATION TOOLS

External links

Proper elements

Epoch

Near present day

Near middle of observation arc

Orbit properties

Epoch
Semimajor Axis
Eccentricity (e)
Inclination (i)
Long. of Ascending Node (Ω)
Arg. of Perihelion (ω)
Mean Anomaly (M)
Perihelion distance
Aphelion distance
Asc. Node-Earth Sep.
Desc. Node-Earth Sep.
MOID
Orbit Period
U parameter

Value

1-sigma variation

Unit

Epoch

Value

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.566779

1-sigma variation

1.915930

Unit

Eccentricity (e)

Value

0.746383

1-sigma variation

0.190832

Unit

Inclination (i)

Value

25.3067

1-sigma variation

7.2334

Unit

Long. of Ascending Node (Ω)

Value

81.5401

1-sigma variation

37.5885

Unit

Arg. of Perihelion (ω)

Value

78.8821

1-sigma variation

9.7987

Unit

Mean Anomaly (M)

Value

120.64864

1-sigma variation

1693.03000

Unit

Perihelion distance

Value

0.650978

1-sigma variation

Unit

Aphelion distance

Value

4.482581

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.009136

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.312341

1-sigma variation

Unit

MOID

Value

0.005099

1-sigma variation

Unit

Orbit Period

Value

1502.0391

1-sigma variation

Unit

U parameter

Value

9.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	3.67079E0	3.65620E-1	-1.38587E1	-7.20170E1	1.87736E1	3.24373E3
e	3.65620E-1	3.64167E-2	-1.38036E0	-7.17308E0	1.86990E0	3.23084E2
i	-1.38587E1	-1.38036E0	5.23218E1	2.71892E2	-7.08775E1	-1.22463E4
Ω	-7.20170E1	-7.17308E0	2.71892E2	1.41290E3	-3.68318E2	-6.36386E4
ω	1.87736E1	1.86990E0	-7.08775E1	-3.68318E2	9.60139E1	1.65895E4
M	3.24373E3	3.23084E2	-1.22463E4	-6.36386E4	1.65895E4	2.86636E6

Date of computation: 2026-07-30 11:21 UTC

Note: The ASCII file is in a format suitable for Orbfit input.

Download ASCII file:

Physical properties

Rotation Period
Quality
Amplitude
Rotation Direction
Spinvector L
Spinvector B

Rotational properties

Value

Unit

Source

Rotation Period

Value

Unit

Source

[-]

Quality

Value

Unit

Source

[-]

Amplitude

Value

Unit

mag

Source

[-]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

Unit

Source

[-]

Spinvector B

Value

Unit

Source

[-]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

Unit

Source

[-]

Taxonomy (all)

Value

Unit

Source

[-]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

19.056

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

400 - 900*

Unit

Source

[2]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Unit

Source

[-]

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Sources

No.	Name	Additional
[1]	ESA Aegis	ESA orbit determination and impact monitoring system
[2]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

Unit

Source

[1]

Unobserved

Value

17037

Unit

Source

[1]

Normalized RMS of residuals

Value

0.449806

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1979-12-11.51059

Unit

Source

[2]

Last Observation

Value

1979-12-15.42951

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

18 (0)

Unit

Source

[1]

Radar Summary

First Observation
Last Observation
Delay (Discarded)
Doppler (Discarded)
Total Optical Observations (Discarded)

Radar

Value

Unit

Source

First Observation

Value

Unit

Source

[-]

Last Observation

Value

Unit

Source

[-]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[-]

Note: The ASCII file is in a format suitable for Orbfit input.

Sources

No.	Name	Additional
[1]	ESA Aegis	ESA orbit determination and impact monitoring system
[2]	MPC	Minor Planet Center: https://www.minorplanetcenter.net

Filters

Initial Date: *

Final Date: *

Normalised Only accepted

Max residual (arcsec):

* - these fields are required

Plot

Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

One line per time step

Time step:*

* - these fields are required

Note: Ephemerides requests are limited to a maximum of 1000 points and a final date not exceeding 2040/12/31 00:00.

Close Approaches for 1979XB from 1950 to 2126

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	1979-12-17 11:22	< 1 min	0.0383699	0.0296649	0.0029017
EARTH	2024-12-10 01:14	> 1 mo	0.0745871	0.0041938	131.9791245
EARTH	2033-05-31 23:41	> 1 mo	0.1504345	0.1338672	32.0139649
EARTH	2061-12-24 11:16	> 1 mo	0.1724150	0.0028237	130.9104541
EARTH	2102-12-13 06:14	> 1 mo	0.0065722	0.0060586	142.5298524
EARTH	2111-05-24 04:18	> 1 mo	0.1609324	0.0902968	15515.5430361

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
325.51802138	338.00685888	0.00509870	MINIMUM
38.88870200	142.51757476	0.13458473	MINIMUM
3.51434540	63.58315091	0.48886714	SADDLE
1.96198361	239.13125049	1.62254854	SADDLE
180.68673082	235.35125205	3.59122341	SADDLE
179.79879355	54.97536895	5.39778370	MAXIMUM

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MOID Plots

Click on the images to zoom-in and zoom-out

Level lines of the squared distance function

1979XB

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2056-12-12.902	72344.902	0.255	0.22 ± 0.106	3.53E6	2.34E-7	5.56E4	-2.82
2065-12-16.463	75635.463	-1.110	1.10 ± 0.091	3.58E7	2.72E-9	1.21E4	-5.39
2101-12-14.204	88781.204	-0.384	0.61 ± 0.000	1.97E8	3.46E-9	2.49E4	-5.30
2113-12-14.753	93164.753	-0.706	0.25 ± 0.028	1.37E6	4.94E-7	1.78E4	-3.33


Based on 18 optical observations (of which 0 are rejected as outliers) from 1979/12/11.511 to 1979/12/15.430.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.09 and 1.09 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
AstOD software version= 4.0, Date of computation=20250805 130500.123 UTC.

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