From Surf Wiki (app.surf) — the open knowledge base

1251 Hedera

Main-belt asteroid

Field	Value
minorplanet	yes
name	1251 Hedera
background	#D6D6D6
image	001251-asteroid shape model (1251) Hedera.png
caption	Modelled shape of Hedera from its lightcurve
discovery_ref
discoverer	K. Reinmuth
discovery_site	Heidelberg Obs.
discovered	25 January 1933
mpc_name	(1251) Hedera
alt_names	1933 BE
A907 GDA915 CA
pronounced
named_after	Hedera (a.k.a. "Ivy")
mp_category	main-belt(middle)
background
orbit_ref
epoch	4 September 2017 (JD 2458000.5)
uncertainty	0
observation_arc	102.80 yr (37,548 days)
aphelion	3.1452 AU
perihelion	2.2884 AU
semimajor	2.7168 AU
eccentricity	0.1577
period	4.48 yr (1,636 days)
mean_anomaly	55.862°
mean_motion	/ day
inclination	6.0489°
asc_node	140.65°
arg_peri	217.52°
mean_diameter	km
44.22 km (calculated)
rotation
h
h
h
h
h
h
albedo	0.057 (assumed)

spectral_type	Tholen E
SMASS X
EC(SDSS-MFB)
B–V 0.689
U–B 0.233
abs_magnitude	10.5

A907 GDA915 CA background 44.22 km (calculated) h h h h h h

SMASS X EC(SDSS-MFB) B–V 0.689 U–B 0.233

1251 Hedera (prov. designation: ) is a background asteroid from the central regions of the asteroid belt, approximately 13 km in diameter. It was discovered on 25 January 1933, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany. The asteroid was named for the climbing plant Hedera, commonly known as "ivy".

Orbit and classification

Hedera is a non-family asteroid from the main belt's background population. It orbits the Sun in the central asteroid belt at a distance of 2.3–3.1 AU once every 4 years and 6 months (1,636 days; semi-major axis of 2.72 AU). Its orbit has an eccentricity of 0.16 and an inclination of 6° with respect to the ecliptic. The asteroid was first observed as at Heidelberg in April 1907. The body's observation arc begins at Heidelberg, the night after its official discovery observation.

Naming

This minor planet was named after the evergreen woody plant Hedera ("ivy") a genus of climbing or ground-creeping woody plants in the aralia family (ivy family). The was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 115).

Reinmuth's flowers

Due to his many discoveries, Karl Reinmuth submitted a large list of 66 newly named asteroids in the early 1930s. The list covered his discoveries with numbers between and . This list also contained a sequence of 28 asteroids, starting with 1054 Forsytia, that were all named after plants, in particular flowering plants (also see list of minor planets named after animals and plants).

Physical characteristics

Hedera is an E-type and X-type asteroid in the Tholen and SMASS classification, respectively.

Rotation period

Several rotational lightcurves of Hedera have been obtained from photometric observations since 2007. Best-rated lightcurve by Julian Oey at Kingsgrove and Leura observatories, Australia, gave a rotation period of 19.9000 hours with a consolidated brightness amplitude between 0.41 and 0.61 magnitude ().

Spin axis

Modeled photometric data from the Lowell Photometric Database (LPD) and the robotic BlueEye600 Observatory, gave a concurring period of 19.9020 hours, Both studies determined two spin axes of (124.0°, −70.0°) and (266.0°, −62.0°), as well as (271.0°, −53.0°) and (115.0°, −62.0°) in ecliptic coordinates (λ, β).

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Hedera measures 13.239 kilometers in diameter and its surface has an albedo of 0.636.

The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and consequently calculates a larger diameter of 44.22 kilometers based on an absolute magnitude of 10.50.

References

{{OED. hederal

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

background-asteroids discoveries-by-karl-wilhelm-reinmuth named-minor-planets e-type-asteroids-(tholen) x-type-asteroids-(smass) astronomical-objects-discovered-in-1933

Want to explore this topic further?

Ask Mako anything about 1251 Hedera — get instant answers, deeper analysis, and related topics.

Research with Mako

Free with your Surf account

Content sourced from Wikipedia, available under CC BY-SA 4.0.

This content may have been generated or modified by AI. CloudSurf Software LLC is not responsible for the accuracy, completeness, or reliability of AI-generated content. Always verify important information from primary sources.

Report