Asteroids

1979XB help

Last update: 2026-03-17 23:26 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

22504743

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

1.916040

Unit

Eccentricity (e)

Value

0.746383

1-sigma variation

0.190840

Unit

Inclination (i)

Value

25.3067

1-sigma variation

7.2335

Unit

Long. of Ascending Node (Ω)

Value

81.5401

1-sigma variation

37.5883

Unit

Arg. of Perihelion (ω)

Value

78.8821

1-sigma variation

9.7973

Unit

Mean Anomaly (M)

Value

120.64862

1-sigma variation

1693.01000

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	3.67121E0	3.65657E-1	-1.38596E1	-7.20207E1	1.87719E1	3.24389E3
e	3.65657E-1	3.64198E-2	-1.38043E0	-7.17334E0	1.86971E0	3.23094E2
i	-1.38596E1	-1.38043E0	5.23231E1	2.71894E2	-7.08682E1	-1.22464E4
Ω	-7.20207E1	-7.17334E0	2.71894E2	1.41288E3	-3.68262E2	-6.36375E4
ω	1.87719E1	1.86971E0	-7.08682E1	-3.68262E2	9.59863E1	1.65869E4
M	3.24389E3	3.23094E2	-1.22464E4	-6.36375E4	1.65869E4	2.86630E6

Date of computation: 2026-03-17 23:26 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

[-]

Download this part as:

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

16973

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

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	0.0296650	0.0029017
EARTH	2024-12-10 01:15	> 1 mo	0.0745852	0.0041938	131.9784363
EARTH	2033-05-31 23:41	> 1 mo	0.1504349	0.1338672	32.0125512
EARTH	2061-12-24 11:15	> 1 mo	0.1724132	0.0028234	130.9248964
EARTH	2102-12-13 06:14	> 1 mo	0.0065702	0.0060586	142.2829351
EARTH	2111-05-24 03:58	> 1 mo	0.1611519	0.0902805	15557.8168312

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
325.53248026	341.10358082	0.00532247	MINIMUM
38.95389669	145.72581521	0.13410510	MINIMUM
3.56390546	66.72942875	0.48981779	SADDLE
2.03315447	242.33573270	1.62290421	SADDLE
180.69881180	238.46979109	3.59072991	SADDLE
179.81033877	58.09352720	5.39845365	MAXIMUM

Download:

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.

Download this part as:

Download Impactor Table as: