Asteroids

2013RH74 help

Last update: 2025-09-10 00:30 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.927

Aphelion (Q)

3.641

Eccentricity (e)

0.594

Inclination (i)

5.5

deg

Orbit period (P)

1261.0

Earth MOID

0.01944

U parameter

0.2

Next Earth close approach

Date

2051-10-22

Nominal distance (from Earth center)

0.03878

5801017

Maximum Brightness

15.9

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

20.9

mag

Diameter

170 - 400*

Taxonomic type

Rotation period (T)

5.346

Discovery Information

Discovery Date

2013-09-15

Observatory

Catalina Sky Survey

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.284307

1-sigma variation

2.482E-8

Unit

Eccentricity (e)

Value

0.594071

1-sigma variation

3.235E-8

Unit

Inclination (i)

Value

5.4768

1-sigma variation

8.880E-6

Unit

Long. of Ascending Node (Ω)

Value

200.4190

1-sigma variation

1.778E-5

Unit

Arg. of Perihelion (ω)

Value

227.7990

1-sigma variation

2.094E-5

Unit

Mean Anomaly (M)

Value

170.62209

1-sigma variation

0.00002

Unit

Perihelion distance

Value

0.927266

1-sigma variation

Unit

Aphelion distance

Value

3.641348

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

1.456879

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.058606

1-sigma variation

Unit

MOID

Value

0.019441

1-sigma variation

Unit

Orbit Period

Value

1261.0434

1-sigma variation

Unit

U parameter

Value

0.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	6.16084E-16	-1.86273E-17	1.60489E-15	-1.28984E-14	-3.80899E-14	-4.96719E-13
e	-1.86273E-17	1.04673E-15	3.64230E-15	-1.70853E-14	3.07513E-13	-6.64666E-14
i	1.60489E-15	3.64230E-15	7.88558E-11	-7.15535E-11	8.08064E-11	-2.26684E-12
Ω	-1.28984E-14	-1.70853E-14	-7.15535E-11	3.16265E-10	-3.01229E-10	2.21624E-12
ω	-3.80899E-14	3.07513E-13	8.08064E-11	-3.01229E-10	4.38329E-10	-9.15083E-12
M	-4.96719E-13	-6.64666E-14	-2.26684E-12	2.21624E-12	-9.15083E-12	4.16647E-10

Date of computation: 2025-09-10 00:30 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

5.346

Unit

Source

[2]

Quality

Value

Unit

Source

[2]

Amplitude

Value

0.21-0.5

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

Unit

Source

[1]

Taxonomy (all)

Value

Unit

Source

[1]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

20.91

20.35

Unit

mag

Source

[3]

[1]

Slope Parameter (G)

Value

0.05

0.15**

Unit

mag

Source

[1]

[3]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[4]

Diameter

Value

170 - 400*

Unit

Source

[4]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.41

0.25

0.79

Unit

V-R

R-I

B-V

Source

[1]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Unit

Source

[5]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Hicks, M. et al. (2013) href="http://www.astronomerstelegram.org/?read=5562"> ATel#5562 (Broadband Photometry of the Potentially Hazardous Asteroid 2013 RH74)
[2]	EARN	1.) Warner, B.D. (2014) MPB 41,113-124. (NEAR-EARTH ASTEROID LIGHTCURVE ANALYSIS AT CS3-PALMER DIVIDE STATION: 2013 SEPTEMBER-DECEMBER)(LCs of 36 NEAs) 2.) Hicks, M. et al. (2013) href="http://www.astronomerstelegram.org/?read=5562"> ATel#5562 (Broadband Photometry of the Potentially Hazardous Asteroid 2013 RH74)
[3]	ESA Aegis	ESA orbit determination and impact monitoring system
[4]	Estimation	Estimated from absolute magnitude
[5]	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

2526

Unit

Source

[1]

Unobserved

Value

1878

Unit

Source

[1]

Normalized RMS of residuals

Value

0.458691

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2013-09-15.35861

Unit

Source

[2]

Last Observation

Value

2020-08-15.60634

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

384 (3)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2013-10-08

Unit

Source

[3]

Last Observation

Value

2013-10-08

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

1 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

1 (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 2013RH74 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	1968-11-01 22:27	1.2	0.0379675	0.0379599	0.0000025
EARTH	2007-01-18 10:47	< 1 min	0.1710137	0.1710119	0.0000006
EARTH	2013-10-17 08:25	< 1 s	0.0525831	0.0525830	0.0000000
EARTH	2051-10-22 07:12	< 1 min	0.0387774	0.0387702	0.0000024
EARTH	2082-12-22 05:31	3.2	0.0924899	0.0924878	0.0000007
EARTH	2114-01-18 05:38	3.2	0.1402395	0.1401827	0.0000189

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
340.90187287	289.92333782	0.01939363	MINIMUM
14.01427336	353.40139798	0.09151970	MINIMUM
5.87681224	337.85281038	0.09374299	SADDLE
359.39449416	145.23146837	1.93915643	SADDLE
179.93756543	145.66825362	2.63128807	SADDLE
179.73099358	325.56753883	4.62572490	MAXIMUM

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MOID Plots

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