jpl.close_approaches

stable Advanced

Upcoming asteroid/comet close approaches within a distance (AU).

GET /v1/jpl/close_approaches

What you get#

A list of Jpl results in Onekey's unified shape, in data (an array). An empty array is a normal, successful answer and is charged like any other; a source that reports "nothing found" as an error returns a free 404 not_found instead.

What it costs#

Advanced · 5 credits for a fresh fetch, charged only when it succeeds.
Free when served from cache (0.2 credit for a cached response over 100 KB).
Free if the request is invalid (never charged) or the source fails or reports not found (refunded).

Parameters#

Name	Type	Required	Default	What it is	Constraints
`dist`	string	no	`0.05`	Max distance in AU	max 6 chars; must match `0(?:\.\d{1,4})?\|[1-9](?:\.\d{1,3})?`; trimmed
`limit`	string	no	`20`	Rows (1-100)	max 3 chars; must match `[1-9]\d?\|100`; trimmed

Request#

curl "https://api.onekey.dev/v1/jpl/close_approaches?limit=5" \
  -H "x-api-key: YOUR_API_KEY"

Try it

Add your key to run this call right here. No key? Get one free. The key stays in this tab.

Recorded response#

A real Jpl response, recorded and returned in Onekey's shape. Fields the platform does not provide are null.

json

{
  "success": true,
  "data": [
    {
      "entity": {
        "name": "2026 SC13"
      },
      "ext": {
        "closeApproach": "2026-Sep-28 02:10",
        "distanceAu": 0.019823951744932,
        "relVelocityKmS": 12.4016316358212,
        "absoluteMagnitude": 22.623,
        "timeUncertainty": "< 00:01"
      }
    },
    {
      "entity": {
        "name": "2026 SA8"
      },
      "ext": {
        "closeApproach": "2026-Sep-28 06:45",
        "distanceAu": 0.00253925938809526,
        "relVelocityKmS": 6.61131689150686,
        "absoluteMagnitude": 28.634,
        "timeUncertainty": "00:22"
      }
    }
  ],
  "metadata": {
    "platform": "jpl",
    "endpoint": "close_approaches",
    "cached": false,
    "stale": false,
    "age_s": 0,
    "fetched_at": "2026-01-01T12:00:00+00:00",
    "credits_charged": 5,
    "request_id": "7f3a9c2e5b1d4c8fa2e6d0b9c4f18e37"
  },
  "error": null
}

Field mapping#

How this endpoint's source fields become Onekey's unified schema. Fields the source lacks come back as null.

Source path	Onekey field	Transform
`0`	`entity.name`	-
`3`	`ext.closeApproach`	-
`4`	`ext.distanceAu`	`toNumber`
`7`	`ext.relVelocityKmS`	`toNumber`
`10`	`ext.absoluteMagnitude`	`toNumber`
`9`	`ext.timeUncertainty`	-

Caching and freshness#

Fresh for about 30 seconds. Repeat calls in that window are served from cache and are free.
Between 30 seconds and 5 minutes the cached copy is still served instantly and marked stale: true while Onekey refreshes it in the background.
If the source is down when a refresh is needed, the last copy can be served for up to 1 hour more (marked stale).
A "not found" is remembered for 1 minute and is free.
The cache is shared across all customers, which is what keeps repeat calls cheap.

What can go wrong#

Status	Code	What to do
401	`unauthorized`	Check the `x-api-key` header.
402	`insufficient_credits`	Add credits; your balance must cover the price.
404	`not_found`	Unknown endpoint path.
422	`invalid_params`	Fix the parameters using the table above. Free.
429	`rate_limited`	Wait `Retry-After` seconds, then retry.
502	`upstream_error`	The source failed. Refunded; retry with backoff.

See Errors for the full list and retry guidance.

Status: stable (verified against the live source).