Asteroids

3553 Mera help

Last update: 2025-03-29 00:18 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Amor

Perihelion (q)

1.118

Aphelion (Q)

2.171

Eccentricity (e)

0.320

Inclination (i)

36.8

deg

Orbit period (P)

770.4

Earth MOID

0.29488

U parameter

0.0

Next Earth close approach

Date

Nominal distance (from Earth center)

Maximum Brightness

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

16.5

mag

Diameter

1300 - 2900*

Taxonomic type

S-

Rotation period (T)

3.194

Discovery Information

Discovery Date

1985-05-14

Observatory

Palomar Mountain

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

1.644601

1-sigma variation

1.506E-9

Unit

Eccentricity (e)

Value

0.319906

1-sigma variation

2.231E-8

Unit

Inclination (i)

Value

36.7752

1-sigma variation

5.872E-6

Unit

Long. of Ascending Node (Ω)

Value

232.4887

1-sigma variation

5.655E-6

Unit

Arg. of Perihelion (ω)

Value

288.8897

1-sigma variation

9.558E-6

Unit

Mean Anomaly (M)

Value

23.16802

1-sigma variation

0.00001

Unit

Perihelion distance

Value

1.118483

1-sigma variation

Unit

Aphelion distance

Value

2.170719

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.327403

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.657545

1-sigma variation

Unit

MOID

Value

0.294884

1-sigma variation

Unit

Orbit Period

Value

770.3520

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.26729E-18	-7.08359E-18	2.21762E-16	-5.11137E-17	-1.16909E-15	-9.67966E-16
e	-7.08359E-18	4.97818E-16	-2.50377E-15	-1.61149E-15	-5.88316E-14	4.23992E-14
i	2.21762E-16	-2.50377E-15	3.44778E-11	1.83010E-11	-1.44031E-11	-1.93063E-13
Ω	-5.11137E-17	-1.61149E-15	1.83010E-11	3.19799E-11	-2.17831E-11	-3.19917E-12
ω	-1.16909E-15	-5.88316E-14	-1.44031E-11	-2.17831E-11	9.13638E-11	-5.56298E-11
M	-9.67966E-16	4.23992E-14	-1.93063E-13	-3.19917E-12	-5.56298E-11	4.95342E-11

Date of computation: 2025-03-28 15:40 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

3.194

Unit

Source

[2]

Quality

Value

Unit

Source

[2]

Amplitude

Value

0.08

Unit

mag

Source

[2]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

Unit

Source

[-]

Spinvector B

Value

Unit

Source

[-]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

S-

Unit

Source

[1]

Taxonomy (all)

Value

S-

Unit

Source

[1]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

16.65

16.543

Unit

mag

Source

[3]

[4]

Slope Parameter (G)

Value

0.24

0.15**

Unit

mag

Source

[5]

[4]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[6]

Diameter

Value

1300 - 2900*

Unit

Source

[6]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Visual S

Unit

Source

[1]

Download this part as:

Sources

No.	Name	Additional
No.[1]	NameEARN	Additional1.) Lazzarin, M., Marchi,S. & Magrin, S. (2010) href="http://www.astro.unipd.it/planets/sineo/data.html"> SINEO Database (Spectroscopic Investiation of Near-Earth Objects)
No.[2]	NameEARN	Additional1.) Galad, A. et al. (2005) Earth, Moon and Planets 97, 147-163. (Joint lightcurve observations of 10 near-Earth asteroids from Modra and Ondrejov) (3553,22753,31669,40267, 66146,88188,103067,1001CB21,2004LJ1,2004XO14,) 2.) Petr Pravec's Ondrejov NEO Photometric Program Webpage "Prepublished Periods"
No.[3]	NameEARN	Additional1.) Pravec, P. et al. (2012) Icarus 221, 365-387 (Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations) 2.) Galad, A. et al. (2005) Earth, Moon and Planets 97, 147-163. (Joint lightcurve observations of 10 near-Earth asteroids from Modra and Ondrejov) (3553,22753,31669,40267, 66146,88188,103067,1001CB21,2004LJ1,2004XO14,)
No.[4]	NameESA Aegis	AdditionalESA orbit determination and impact monitoring system
No.[5]	NameEARN	Additional1.) Pravec, P. et al. (2012) Icarus 221, 365-387 (Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations)
No.[6]	NameEstimation	AdditionalEstimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

14564

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.431856

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1985-05-11.33542

Unit

Source

[2]

Last Observation

Value

2025-03-26.025154

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

1784 (9)

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

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
45.68619945	121.34175961	0.29488357	MINIMUM
294.89878519	331.57223135	0.53556410	MINIMUM
343.20387800	34.25041772	0.68471744	SADDLE
169.67795132	234.90478413	1.46943104	SADDLE
354.74447364	233.74879024	2.02671057	SADDLE
190.93587487	72.91870679	3.04880548	MAXIMUM

Download:

MOID Plots

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