522 Helga: Difference between revisions

522 Helga
Discovery
Discovered by	Max Wolf
Discovery site	Heidelberg Observatory
Discovery date	10 January 1904
Designations
MPC designation	(522) Helga
Pronunciation	German: [ˈhɛlɡaː]
Alternative designations	1904 NC
Orbital characteristics
	Epoch 31 July 2016 (JD 2457600.5)
	Uncertainty parameter 0
Observation arc	114.65 yr (41876 d)
Aphelion	3.9372 AU (589.00 Gm)
Perihelion	3.3284 AU (497.92 Gm)
Semi-major axis	3.6328 AU (543.46 Gm)
Eccentricity	0.083794
Orbital period (sidereal)	6.92 yr (2529.1 d)
Mean anomaly	200.06°
Mean motion	0° 8m 32.424s / day
Inclination	4.4174°
Longitude of ascending node	116.683°
Argument of perihelion	246.503°
Physical characteristics
Mean radius	50.61±1.75 km
Synodic rotation period	8.129 h (0.3387 d)
Geometric albedo	0.0388±0.003
Absolute magnitude (H)	9.0

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522 Helga, provisional designation 1904 NC is a large main belt asteroid (minor planet). It was discovered in 1904 by Max Wolf in Heidelberg. Helga is notable for being the first such object to be shown to be in a stable but chaotic orbit in resonance with Jupiter, its Lyapunov time being relatively short, at 6,900 yr. Despite this, its orbit appears to be stable, as the eccentricity and precession rates are such that it avoids close encounters with Jupiter.^[3] It forms part of the Cybele asteroid group.^[4]

522 Helga was "named by Lt. Th. Lassen, orbit computer" according to Paul Herget's The Names of the Minor Planets^[5] (note that computer does not refer to a personal computer, i.e. a machine, but rather to a person actually doing the necessary calculations).

References

^ (German Names)
^ "522 Helga (1904 NC)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 6 May 2016.
^ Milani, Andrea; Nobili, Anna M. (June 1992). "An example of stable chaos in the Solar System". Nature. 357 (6379): 569–571. Bibcode:1992Natur.357..569M. doi:10.1038/357569a0. ISSN 1476-4687. S2CID 4367823.
^ Lagerkvist, Claes-Ingvar; et al. (January 2001), "A Study of Cybele Asteroids. I. Spin Properties of Ten Asteroids", Icarus, 149 (1): 190–197, Bibcode:2001Icar..149..190L, doi:10.1006/icar.2000.6507.
^ Title: Benennung von kleinen Planeten; Journal: Astronomische Nachrichten, volume 169, p.363; Bibliographic Code: 1905AN....169..363.

External links

522 Helga at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
522 Helga at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

This article about an asteroid native to the asteroid belt is a stub. You can help Wikipedia by expanding it.

[1] (German Names)

[jpldata-2] "522 Helga (1904 NC)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 6 May 2016.

[3] Milani, Andrea; Nobili, Anna M. (June 1992). "An example of stable chaos in the Solar System". Nature. 357 (6379): 569–571. Bibcode:1992Natur.357..569M. doi:10.1038/357569a0. ISSN 1476-4687. S2CID 4367823.

[Lagerkvist2001-4] Lagerkvist, Claes-Ingvar; et al. (January 2001), "A Study of Cybele Asteroids. I. Spin Properties of Ten Asteroids", Icarus, 149 (1): 190–197, Bibcode:2001Icar..149..190L, doi:10.1006/icar.2000.6507.

[5] Title: Benennung von kleinen Planeten; Journal: Astronomische Nachrichten, volume 169, p.363; Bibliographic Code: 1905AN....169..363.

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[3]

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[5]

@@ Line 1: / Line 1: @@
-{{Refimprove|date=September 2014}}
+{{Use dmy dates|date=October 2019}}
 {{Infobox planet
  | minorplanet= yes
@@ Line 5: / Line 5: @@
  | name= 522 Helga
  | mpc_name= (522) Helga
+ | pronounced= {{IPA|de|ˈhɛlɡaː|lang}}<ref>[https://www.germannames.de/wiki/Helga (German Names)]</ref>
  | alt_names= 1904 NC
  | discoverer= [[Max Wolf]]
@@ Line 20: / Line 21: @@
  | mean_anomaly= 200.06[[Degree (angle)|°]]
  | mean_motion= {{Deg2DMS|0.14234|sup=ms}} / day
- | orbit_ref= <ref name="jpldata">{{Cite web |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=522;cad=1 |title=522 Helga (1904 NC) |work=[[JPL Small-Body Database]] |publisher=[[NASA]]/[[Jet Propulsion Laboratory]] |access-date=6 May 2016}}</ref>
+ | orbit_ref= <ref name="jpldata">{{Cite web |url=https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=522;cad=1 |title=522 Helga (1904 NC) |work=[[JPL Small-Body Database]] |publisher=[[NASA]]/[[Jet Propulsion Laboratory]] |access-date=6 May 2016}}</ref>
  | observation_arc= 114.65 yr (41876 d)
  | uncertainty= 0
@@ Line 29: / Line 30: @@
 }}
-'''Helga''' (minor planet designation: '''522 Helga'''), provisional designation '''1904 NC''' is an [[asteroid]] ([[minor planet]]) orbiting the [[Sun]] discovered in [[1904 in science|1904]] by [[Max Wolf]] in [[Heidelberg]]. Helga is notable for being the first such object to be shown to be in a stable but [[Chaos theory|chaotic]] orbit in [[resonance]] with [[Jupiter]], its [[Lyapunov exponent|Lyapunov time]] being relatively short, at 6,900 yr. Despite this, its orbit appears to be stable, as the [[Orbital eccentricity|eccentricity]] and [[precession]] rates are such that it avoids close encounters with Jupiter.<ref>[http://www.nature.com/nature/journal/v357/n6379/abs/357569a0.html Nature]</ref>
+'''522 Helga''', provisional designation '''1904 NC''' is a large [[main belt]] [[asteroid]] ([[minor planet]]). It was discovered in [[1904 in science|1904]] by [[Max Wolf]] in [[Heidelberg]]. Helga is notable for being the first such object to be shown to be in a stable but [[Chaos theory|chaotic]] orbit in [[resonance]] with [[Jupiter]], its [[Lyapunov exponent|Lyapunov time]] being relatively short, at 6,900 yr. Despite this, its orbit appears to be stable, as the [[Orbital eccentricity|eccentricity]] and [[precession]] rates are such that it avoids close encounters with Jupiter.<ref>{{Cite journal |last1=Milani |first1=Andrea |last2=Nobili |first2=Anna M. |date=June 1992 |title=An example of stable chaos in the Solar System |url=https://www.nature.com/articles/357569a0 |journal=Nature |language=en |volume=357 |issue=6379 |pages=569–571 |doi=10.1038/357569a0 |bibcode=1992Natur.357..569M |s2cid=4367823 |issn=1476-4687}}</ref> It forms part of the [[Cybele asteroid|Cybele asteroid group]].<ref name=Lagerkvist2001/>
 Helga was "named by Lt. Th. Lassen, orbit computer" according to [[Paul Herget]]'s ''[[The Names of the Minor Planets]]''<ref>[http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1905AN....169..363. Title: Benennung von kleinen Planeten; Journal: Astronomische Nachrichten, volume 169, p.363; Bibliographic Code: 1905AN....169..363.]</ref> (note that ''computer'' does not refer to a [[personal computer]], i.e. a machine, but rather to a person actually doing the necessary calculations).
 ==References==
-{{Reflist}}
+{{Reflist|refs=
+<ref name=Lagerkvist2001>{{citation
+ | title=A Study of Cybele Asteroids. I. Spin Properties of Ten Asteroids
+ | last1=Lagerkvist | first1=Claes-Ingvar
+ | last2=Erikson | first2=Anders
+ | last3=Lahulla | first3=Felix
+ | last4=De Martino | first4=Mario
+ | last5=Nathues | first5=Andreas
+ | last6=Dahlgren | first6=Mats
+ | display-authors=1
+ | journal=Icarus
+ | volume=149
+ | issue=1
+ | pages=190–197
+ | date=January 2001
+ | doi=10.1006/icar.2000.6507
+ | bibcode=2001Icar..149..190L
+ | postscript=.
+}}</ref>
+}}
 ==External links==
+* {{AstDys|522}}
 * {{JPL small body}}
-{{Minor planets navigator|521 Brixia|number=522|523 Ada}}
+{{Minor planets navigator |521 Brixia |number=522 |523 Ada}}
 {{Small Solar System bodies}}
+{{Authority control}}
 {{DEFAULTSORT:000522}}
 [[Category:Cybele asteroids]]
 [[Category:Discoveries by Max Wolf|Helga]]
-[[Category:Minor planets with names of unknown origin|Helga]]
 [[Category:Named minor planets|Helga]]
 [[Category:X-type asteroids (Tholen)]]