getEpochTimestamp returning NaN

[louisjmorgan]

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When I use the getEpochTimestamp function it returns a NaN. All other get functions are working as expected.

function convertTLE(tle) { const satelliteData = { name: getSatelliteName(tle), semiMajorAxis: getSemiMajorAxis(getMeanMotion(tle)), eccentricity: getEccentricity(tle), inclination: getInclination(tle), rightAscension: getRightAscension(tle), perigee: getPerigee(tle), meanAnomaly: getMeanAnomaly(tle), epoch: getEpochTimestamp(tle), }; console.log(getEpochTimestamp(tle)); return satelliteData; }

[davidcalhoun]

Thanks for the heads up - can you provide the tle you're inputting? The test seems to be working fine using the ISS's tle.

[louisjmorgan]

Wow thanks for the prompt response!

I'm using the ISS one from celestrak, I suspected this could be the issue but the format looks right to me:

const tle = ISS (ZARYA) 1 25544U 98067A 22005.58472471 .00003968 00000+0 77828-4 0 9998 2 25544 51.6440 61.8159 0005338 6.5542 157.7978 15.49868185319960;

thanks in advance, Louis

---

From: David Calhoun @.> Sent: 05 January 2022 17:24 To: davidcalhoun/tle.js @.> Cc: louisjmorgan @.>; Author @.> Subject: Re: [davidcalhoun/tle.js] getEpochTimestamp returning NaN (Issue #28)

Thanks for the heads up - can you provide the tle you're inputting? The testhttps://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fdavidcalhoun%2Ftle.js%2Fblob%2Fmaster%2F__tests__%2Fgetters.js%23L208&data=04%7C01%7C%7C8a5b6709f9bd466ad7ef08d9d0704753%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637770002911189860%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=W15VVQ3GNsL0Up9vv07CEtyfY04A4IEHKEnMND3CH68%3D&reserved=0 seems to be working fine using the ISS's tle.

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[davidcalhoun]

On first glance it looks like there's an extra two spaces in front of line 1 and 2? Could you try with this instead?

const tle = `ISS (ZARYA)
1 25544U 98067A   22005.58472471  .00003968  00000+0  77828-4 0  9998
2 25544  51.6440  61.8159 0005338   6.5542 157.7978 15.49868185319960`;

[louisjmorgan]

Unfortunately that's not working either. I've tried copying tle strings directly from your tests​ folder and those are not working either. As I said before the other getters are all working as expected.

---

From: David Calhoun @.> Sent: 05 January 2022 17:58 To: davidcalhoun/tle.js @.> Cc: louisjmorgan @.>; Author @.> Subject: Re: [davidcalhoun/tle.js] getEpochTimestamp returning NaN (Issue #28)

On first glance it looks like there's an extra two spaces in front of line 1 and 2? Could you try with this instead?

const tle = ISS (ZARYA) 1 25544U 98067A 22005.58472471 .00003968 00000+0 77828-4 0 9998 2 25544 51.6440 61.8159 0005338 6.5542 157.7978 15.49868185319960;

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[davidcalhoun]

Weird, I'm not sure what's happening, I can't reproduce it. I tried it on both Node.js v14.17.5 and v16.13.1 and it works for me. Added this test, which passes on my side:

test("getEpochTimestamp 2", () => {
	const tle = `ISS (ZARYA)
1 25544U 98067A   22005.58472471  .00003968  00000+0  77828-4 0  9998
2 25544  51.6440  61.8159 0005338   6.5542 157.7978 15.49868185319960`;
	expect(getEpochTimestamp(tle)).toEqual(1641391320214);
});

First thing I'd try is to console.log the tle you're inputting into getEpochTimestamp - maybe it's not passing in what you expect?

Also, are you running this in Node or in a browser? If you could provide version details I'll try to reproduce on my side.

[louisjmorgan]

I'm using Node v16.13.1 with react and webpack, but all the calculations are contained within a single react component so I'm not sure that's affecting anything. The console output for the TLE looked normal:

ISS (ZARYA) 1 25544U 98067A 22005.58472471 .00003968 00000+0 77828-4 0 9998 2 25544 51.6440 61.8159 0005338 6.5542 157.7978 15.49868185319960

I'll try running your test in a basic two file node setup shortly and let you know if it exhibits the same behaviour.

Thanks again for your help, Louis

---

From: David Calhoun @.> Sent: 06 January 2022 15:25 To: davidcalhoun/tle.js @.> Cc: louisjmorgan @.>; Author @.> Subject: Re: [davidcalhoun/tle.js] getEpochTimestamp returning NaN (Issue #28)

Weird, I'm not sure what's happening, I can't reproduce it. I tried it on both Node.js v14.17.5 and v16.13.1 and it works. Added this test, which passes on my side:

test("getEpochTimestamp 2", () => { const tle = ISS (ZARYA) 1 25544U 98067A 22005.58472471 .00003968 00000+0 77828-4 0 9998 2 25544 51.6440 61.8159 0005338 6.5542 157.7978 15.49868185319960; expect(getEpochTimestamp(tle)).toEqual(1641391320214); });

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[thkruz]

@louisjmorgan did you have any luck? Would be nice to close this issue if it works now.

[louisjmorgan]

No to be honest I didn't. I switched to using satellite-js which was more suited to my needs as I'm calculating orbital positions.

[davidcalhoun]

Closing this out as I'm unable to reproduce.