# Oskar Backlund

> Swedish astronomer (1846–1916)

**Wikidata**: [Q358257](https://www.wikidata.org/wiki/Q358257)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Oskar_Backlund)  
**Source**: https://4ort.xyz/entity/oskar-backlund

## Summary
Oskar Backlund was a Swedish astronomer (1846–1916) renowned for his research on celestial mechanics and cometary orbits. He served as director of the Pulkovo Observatory in Russia and made significant contributions to the study of Encke's Comet, refining calculations of its orbit and gravitational perturbations.

## Biography
- **Born:** April 28, 1846, in Länghem, Sweden
- **Nationality:** Swedish (later affiliated with the Russian Empire)
- **Education:** Uppsala University (studied astronomy and mathematics)
- **Known for:** Research on cometary orbits, particularly Encke's Comet, and leadership at Pulkovo Observatory
- **Employer(s):** Pulkovo Observatory (director), Uppsala University (early career)
- **Field(s):** Astronomy, celestial mechanics

## Contributions
Oskar Backlund conducted groundbreaking work on the orbit of **Encke's Comet**, refining calculations to account for gravitational perturbations from planets and non-gravitational forces. His research advanced the understanding of cometary dynamics and earned him international recognition. He also contributed to the **Pulkovo Observatory's** reputation as a leading center for astronomical research during his tenure as director (1895–1916). Backlund's work was published in prominent journals and influenced later studies in celestial mechanics.

## FAQs
### **What was Oskar Backlund's most significant discovery?**
Backlund is best known for his detailed studies of **Encke's Comet**, where he improved orbital calculations by incorporating non-gravitational effects, a major advancement in cometary astronomy.

### **Where did Oskar Backlund work?**
He began his career at **Uppsala University** and later became director of the **Pulkovo Observatory** in Russia, one of the most prestigious observatories of the time.

### **What awards did Oskar Backlund receive?**
He was honored with the **Gold Medal of the Royal Astronomical Society (1909)**, the **Bruce Medal (1909)**, and the **Lalande Prize (1886)** for his contributions to astronomy.

### **How did Backlund contribute to astronomy beyond research?**
As director of **Pulkovo Observatory**, he oversaw its operations and maintained its status as a key institution for astronomical observations and research.

### **Was Backlund affiliated with any scientific academies?**
Yes, he was a member of multiple prestigious academies, including the **Royal Swedish Academy of Sciences**, the **Russian Academy of Sciences**, and the **American Academy of Arts and Sciences**.

## Why They Matter
Oskar Backlund's work on **Encke's Comet** provided critical insights into the behavior of comets under gravitational and non-gravitational influences, shaping modern celestial mechanics. His leadership at **Pulkovo Observatory** ensured its continued prominence in 19th- and early 20th-century astronomy. His research laid the groundwork for future studies on cometary orbits and planetary perturbations.

## Notable For
- **Gold Medal of the Royal Astronomical Society (1909)**
- **Bruce Medal (1909)**
- **Lalande Prize (1886)**
- **Director of Pulkovo Observatory (1895–1916)**
- **Member of the Royal Swedish Academy of Sciences**
- **Member of the Russian Academy of Sciences**
- **Fellow of the American Academy of Arts and Sciences**
- **Research on Encke's Comet and celestial mechanics**

## Body

### **Early Life and Education**
Oskar Backlund was born on **April 28, 1846**, in **Länghem, Sweden**. He studied at **Uppsala University**, where he developed expertise in astronomy and mathematics.

### **Career and Research**
Backlund began his career at **Uppsala University** before moving to **Pulkovo Observatory** in Russia. In **1895**, he became its director, a position he held until his death in **1916**. His most significant work involved **Encke's Comet**, where he refined orbital calculations by accounting for non-gravitational forces, a breakthrough in cometary studies.

### **Awards and Honors**
Backlund received multiple prestigious awards, including:
- **Gold Medal of the Royal Astronomical Society (1909)**
- **Bruce Medal (1909)**
- **Lalande Prize (1886)**

### **Affiliations and Memberships**
He was a member of several esteemed scientific organizations:
- **Royal Swedish Academy of Sciences**
- **Russian Academy of Sciences**
- **American Academy of Arts and Sciences**
- **Accademia Nazionale dei Lincei (Italy)**
- **National Academy of Sciences (USA)**

### **Legacy**
Backlund's research on cometary orbits and celestial mechanics remains influential in astronomy. His leadership at **Pulkovo Observatory** cemented its reputation as a leading institution. The asteroid **856 Backlunda** and the lunar crater **Backlund** are named in his honor, commemorating his contributions to science.

## References

1. Johan Oskar (Oskar Andreevitj) Backlund. Dictionary of Swedish National Biography
2. Czech National Authority Database
3. Mathematics Genealogy Project
4. Integrated Authority File
5. Source
6. [Source](https://phys-astro.sonoma.edu/brucemedalists/oskar-backlund)
7. Complete List of Royal Society Fellows 1660-2007
8. International Standard Name Identifier
9. Virtual International Authority File
10. BnF authorities
11. [Dannike kyrkoarkiv, Födelse- och dopböcker, SE/GLA/13086/C/3 (1832-1860), bildid: C0043485_00042, sida 66. Swedish church birth records](https://sok.riksarkivet.se/bildvisning/C0043485_00042#?c=&m=&s=&cv=41&xywh=381%2C980%2C1638%2C1125)
12. La France savante
13. Biographical Database of Southern African Science
14. Freebase Data Dumps. 2013
15. [BnF authorities](https://data.bnf.fr/en/10231462/oscar_backlund/)
16. [Source](https://data.bnf.fr/en/10231462/oscar_backlund/)
17. LIBRIS. 2012