Asteroids

29075 1950DA help

Last update: 2025-07-29 02:36 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

0.837

Aphelion (Q)

2.561

Eccentricity (e)

0.508

Inclination (i)

12.2

deg

Orbit period (P)

808.7

Earth MOID

0.03941

U parameter

0.0

A₂

-6.5

10^-15au/days²

Next Earth close approach

Date

2032-03-02

Nominal distance (from Earth center)

0.07575

11332390

Maximum Brightness

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

17.3

mag

Diameter

1810

Taxonomic type

E/M:

Rotation period (T)

2.122

Discovery Information

Discovery Date

1950-02-22

Observatory

Lick Observatory, Mount Hamilton

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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.698679

1-sigma variation

1.057E-9

Unit

Eccentricity (e)

Value

0.507505

1-sigma variation

1.342E-8

Unit

Inclination (i)

Value

12.1546

1-sigma variation

3.194E-6

Unit

Long. of Ascending Node (Ω)

Value

356.5470

1-sigma variation

4.951E-6

Unit

Arg. of Perihelion (ω)

Value

224.8264

1-sigma variation

5.959E-6

Unit

Mean Anomaly (M)

Value

312.28569

1-sigma variation

2.498E-6

Unit

Perihelion distance

Value

0.836590

1-sigma variation

Unit

Aphelion distance

Value

2.560768

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.966373

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.067973

1-sigma variation

Unit

MOID

Value

0.039413

1-sigma variation

Unit

Orbit Period

Value

808.6592

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

A₂

Value

-6.50155

1-sigma variation

1.16369

Unit

10^-15au/days²

Covariance Matrix

	a	e	i	Ω	ω	M	A₂
a	1.11760E-18	-7.23474E-18	-1.09021E-15	-1.13317E-15	2.59545E-15	-2.40174E-15	1.18811E-9
e	-7.23474E-18	1.80078E-16	2.60721E-15	4.06200E-14	-4.91822E-14	1.96696E-14	-5.44754E-9
i	-1.09021E-15	2.60721E-15	1.01986E-11	-1.07890E-11	7.90701E-12	4.45604E-12	-6.81267E-7
Ω	-1.13317E-15	4.06200E-14	-1.07890E-11	2.45137E-11	-2.68203E-11	1.58523E-12	-1.12337E-6
ω	2.59545E-15	-4.91822E-14	7.90701E-12	-2.68203E-11	3.55038E-11	-6.30891E-12	2.37233E-6
M	-2.40174E-15	1.96696E-14	4.45604E-12	1.58523E-12	-6.30891E-12	6.23764E-12	-2.26931E-6
A₂	1.18811E-9	-5.44754E-9	-6.81267E-7	-1.12337E-6	2.37233E-6	-2.26931E-6	1.35418E0

Date of computation: 2025-07-29 02:36 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

2.122

Unit

Source

[3]

Quality

Value

Unit

Source

[3]

Amplitude

Value

0.2

Unit

mag

Source

[3]

Rotation Direction

Value

RETRO

Unit

Source

[1]

Spinvector L

Value

187

Unit

Source

[1]

Spinvector B

Value

-89

Unit

Source

[1]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

E/M:

Unit

Source

[2]

Taxonomy (all)

Value

E/M:

Unit

Source

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

17.252

17.55

Unit

mag

Source

[4]

[3]

Slope Parameter (G)

Value

0.15**

0.03

Unit

mag

Source

[4]

[3]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.07

0.078

Unit

Source

[7]

[5]

Diameter

Value

1810

Unit

Source

[5]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.49

0.86

Unit

V-R

B-V

Source

[8]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Visual S

Radar R

Unit

Source

[2]

[9]

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Sources

No.	Name	Additional
[1]	EARN	1.) Farnocchia, D. & S.R. Chesley (2014) Icarus 229, 321-327. (Assessment of the 2880 impact threat from asteroid (29075) 1950 DA)
[2]	EARN	1.) Rivkin, A.S. et al. (2005) Icarus 175, 175-180. (Constraining near-Earth object albedos using near-infrared spectroscopy) (1580,3103,29075,2001 ME1, 26760)
[3]	EARN	1.) Petr Pravec's Ondrejov NEO Photometric Program Webpage "Prepublished Periods"
[4]	ESA Aegis	ESA orbit determination and impact monitoring system
[5]	EARN	1.) Joseph R. Masiero et al 2021 Planet. Sci. J. 2 162
[6]	EARN	1.) Mainzer, A. et al. (2011) ApJ 743, 156. (NEOWISE Observations of Near-Earth Objects: Preliminary Results) (albedo and diameters of 428 NEOs) 2.) Binzel, R.P. et al. (2002) in "Asteroids III" (Eds. W.F.Bottke et al.), Univ.Ariz.Press, Tucson, USA, pp. 255-271. (Physical Properties of NEOs) 3.) Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; et al. (2011) Astrophys. J. 741, A90. See also Grav 2012b and Masiero 2012.
[7]	EARN	1.) Mainzer, A. et al. (2011) ApJ 743, 156. (NEOWISE Observations of Near-Earth Objects: Preliminary Results) (albedo and diameters of 428 NEOs) 2.) Rivkin, A.S. et al. (2005) Icarus 175, 175-180. (Constraining near-Earth object albedos using near-infrared spectroscopy) (1580,3103,29075,2001 ME1, 26760) 3.) Binzel, R.P. et al. (2002) in "Asteroids III" (Eds. W.F.Bottke et al.), Univ.Ariz.Press, Tucson, USA, pp. 255-271. (Physical Properties of NEOs) 4.) Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; et al. (2011) Astrophys. J. 741, A90. See also Grav 2012b and Masiero 2012.
[8]	EARN	1.) Dandy, C.L.; Fitzsimmons, A.; Collander-Brown, S.J. (2003) Icarus 163, 363-373. (Optical colors of 56 near-Earth objects: trends with size and orbit)
[9]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

27460

Unit

Source

[1]

Unobserved

Value

123

Unit

Source

[1]

Normalized RMS of residuals

Value

0.514216

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1950-02-22.23014

Unit

Source

[2]

Last Observation

Value

2025-04-28.83791

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

1136 (10)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2001-03-03

Unit

Source

[3]

Last Observation

Value

2012-05-01

Unit

Source

[3]

Delay (Discarded)

Value

8 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

4 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

12 (0)

Unit

Source

[1]

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
[3]	JPL Radar Observations	Jet Propulsion Laboratory: https://ssd.jpl.nasa.gov/dat/radar_data_ast.txt

Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

One line per time step

Time step:*

* - these fields are required

Close Approaches for 29075 1950DA from 1950 to 2125

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	1950-03-12 23:35	< 1 min	0.0592866	0.0592860	0.0000002
EARTH	2001-03-05 01:22	< 1 s	0.0520726	0.0520726	0.0000000
EARTH	2032-03-02 06:43	< 1 s	0.0757523	0.0757521	0.0000001
EARTH	2074-03-19 22:17	< 1 min	0.0954592	0.0954584	0.0000003
EARTH	2105-03-10 01:38	< 1 min	0.0363159	0.0363157	0.0000001

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
327.52016054	64.46624545	0.03941335	MINIMUM
39.55593336	183.95917948	0.20573175	MINIMUM
13.28703091	141.01320218	0.23847212	SADDLE
181.89007998	299.89025595	1.58704098	SADDLE
2.77330044	302.40207868	1.82271665	SADDLE
179.92720746	118.77664847	3.56044984	MAXIMUM

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MOID Plots

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

Level lines of the squared distance function

29075 1950DA

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS	TS
2880-03-16.992	373033.992	2.221	0.000	0.13 ± 0.001	4.39E3	1.96E-5	9.59E4	-2.13	n/a


Based on 925 optical observations (of which 9 are rejected as outliers) and on 12 radar observations (of which 0 are rejected as outliers) from 1950/02/22.230 to 2021/12/03.144.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.28 and 1.28 Earth radii. Coordinates for LOV = EQU scaled= 1 second= F.
AstOD software version= 2.0, Date of computation=20250805 130500.123 UTC.

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