# Trilling 2018: Spitzer Observations of Interstellar Object 1I/'Oumuamua

> David E. Trilling, Michael Mommert, Joseph L. Hora et al., 2018. 6 records on Mysteries Department cite it. The size and outgassing limits that every…

Source: https://mysteriesdept.com/sources/SRC0CSKB4HY02PY/spitzer-observations-of-interstellar-object-1i-oumuamua  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

---

[Sources](https://mysteriesdept.com/sources)[1I/'Oumuamua](https://mysteriesdept.com/mysteries/oumuamua)Trilling 2018

**0**

# Spitzer Observations of Interstellar Object 1I/'Oumuamua

David E. Trilling, Michael Mommert, Joseph L. Hora et al., 2018. _The Astronomical Journal_.

A 30.2-hour Spitzer integration at 4.5 microns on 21-22 November 2017 did not detect the object: a 3-sigma flux limit of 0.3 microjanskys, an effective diameter below 98, 140 or 440 m depending on the thermal model, an albedo above 0.2, 0.1 or 0.01, and upper limits on CO2, CO and dust production lower than any before. AJ 156, 261.

**1I/'Oumuamua** Articledoi: **[10.3847/1538-3881/aae88f](https://doi.org/10.3847/1538-3881/aae88f)** Checked against the original0

## What it's used for here

The size and outgassing limits that every composition hypothesis has to satisfy.

## Cited by on this site 6 records

[Spitzer IRAC 4.5-micron observations of 'Oumuamua (DDT programme 13249) and the published limits](https://mysteriesdept.com/datasets/DAT0CSKCTGG3GMB/spitzer-irac-4-5-micron-observations-of-oumuamua-ddt)

Dataset

DAT

[No water outgassing was ever detected.](https://mysteriesdept.com/mysteries/oumuamua/evidence/EVD0CSKCA527WAC/no-water-outgassing-was-ever-detected)

Evidence

EVD

[Spitzer limits CO and CO2 to about ten thousand times below what the outgassing model needed; water was not…](https://mysteriesdept.com/mysteries/oumuamua/evidence/EVD0CSKC1BT03JA/spitzer-limits-co-and-co2-to-about-ten-thousand-times-below)

Evidence

EVD

[Spitzer integrates for 30.2 hours at 4.5 microns and does not detect it](https://mysteriesdept.com/mysteries/oumuamua/events/EVT0CSKBW7R6JME/spitzer-integrates-for-30-2-hours-at-4-5-microns-and-does)

EVT

[1I/'Oumuamua](https://mysteriesdept.com/mysteries/oumuamua)

The mystery article

MYS

[What pushed 'Oumuamua away from the Sun?](https://mysteriesdept.com/mysteries/oumuamua/questions/QST0CSKBZDA67JF/what-pushed-oumuamua-away-from-the-sun)

Question

QST

## Cite it

```
Trilling, D. E., Mommert, M., Hora, J. L., Farnocchia, D., Chodas, P., Giorgini, J., Smith, H. A., Carey, S., Lisse, C. M., Werner, M., McNeill, A., Chesley, S. R., Emery, J. P., Fazio, G., Fernandez, Y. R., Harris, A., Marengo, M., Mueller, M., Roegge, A., Smith, N., Weaver, H. A., Meech, K., & Micheli, M. (2018). Spitzer Observations of Interstellar Object 1I/'Oumuamua. The Astronomical Journal. https://doi.org/10.3847/1538-3881/aae88f
```

[Read it free at doi.org](https://doi.org/10.3847/1538-3881/aae88f)

Key

**SRC** 0CSKB4HY02PY

Kind

Journal article

Rights

The publisher's

Kept

27 Oct 2026, for editors

Checked

Against the published article

Added by

[apollo](https://mysteriesdept.com/u/apollo)

The record

Bibliographic records are CC0. Take this one as CSL-JSON, BibTeX or RIS.

[CSL-JSON](https://mysteriesdept.com/sources/SRC0CSKB4HY02PY/spitzer-observations-of-interstellar-object-1i-oumuamua/csl.json)