| Parameter |
Value |
| Designation |
C/2019 K6 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-05-20T00:32:38.981760Z |
| Orbit solution date (soln_date, UTC) |
2022-01-05T13:06:41Z |
| Obs used |
360 |
| NEO |
- |
| M1 |
9.600 |
| K1 |
11.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-05-31T13:20:54.816000Z |
| Discovery magnitude (MPC) |
21.10 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-08-12.0000000 |
| e |
0.99756459 |
| q (au) |
3.928974 |
| a (au) |
1613.267974 |
| i (deg) |
132.394317 |
| Ω (om, deg) |
42.926027 |
| ω (w, deg) |
187.578586 |
| M (ma, deg) |
359.995710 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.462 + 5.788\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.462 |
| n |
5.788 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
10.000 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2019-05-07 |
2020-05-14 |
+1.2378 |
-0.912 |
| 2020-05-21 |
2021-03-13 |
+7.1303 |
-3.375 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
05:51:16.70 |
-11:49:11.7 |
HIP 27657 |
10.49 |
| 2026-09-20 12:00 |
05:51:15.47 |
-11:50:05.1 |
HIP 27657 |
11.41 |
| 2026-09-21 00:00 |
05:51:14.17 |
-11:50:58.6 |
HIP 27657 |
12.34 |
| 2026-09-21 12:00 |
05:51:12.81 |
-11:51:52.0 |
HIP 27657 |
13.27 |
| 2026-09-22 00:00 |
05:51:11.38 |
-11:52:45.5 |
HIP 27657 |
14.21 |
| 2026-09-22 12:00 |
05:51:09.89 |
-11:53:39.1 |
HIP 27657 |
15.15 |
| 2026-09-23 00:00 |
05:51:08.34 |
-11:54:32.7 |
HIP 27657 |
16.10 |
| 2026-09-23 12:00 |
05:51:06.72 |
-11:55:26.2 |
HIP 27657 |
17.06 |
| 2026-09-24 00:00 |
05:51:05.03 |
-11:56:19.8 |
HIP 27657 |
18.02 |
| 2026-09-24 12:00 |
05:51:03.29 |
-11:57:13.5 |
HIP 27657 |
18.99 |
| 2026-09-25 00:00 |
05:51:01.47 |
-11:58:07.1 |
HIP 27657 |
19.97 |
| 2026-09-25 12:00 |
05:50:59.59 |
-11:59:00.7 |
HIP 27657 |
20.95 |
| 2026-09-26 00:00 |
05:50:57.65 |
-11:59:54.4 |
HIP 27657 |
21.93 |
| 2026-09-26 12:00 |
05:50:55.64 |
-12:00:48.0 |
HIP 27657 |
22.93 |
| 2026-09-27 00:00 |
05:50:53.57 |
-12:01:41.6 |
HIP 27509 |
23.15 |
| 2026-09-27 12:00 |
05:50:51.43 |
-12:02:35.3 |
HIP 27509 |
22.25 |
| 2026-09-28 00:00 |
05:50:49.23 |
-12:03:28.8 |
HIP 27509 |
21.35 |
| 2026-09-28 12:00 |
05:50:46.96 |
-12:04:22.4 |
HIP 27509 |
20.45 |
| 2026-09-29 00:00 |
05:50:44.62 |
-12:05:16.0 |
HIP 27509 |
19.55 |
| 2026-09-29 12:00 |
05:50:42.23 |
-12:06:09.5 |
HIP 27509 |
18.65 |
| 2026-09-30 00:00 |
05:50:39.76 |
-12:07:03.0 |
HIP 27509 |
17.75 |
| 2026-09-30 12:00 |
05:50:37.23 |
-12:07:56.4 |
HIP 27509 |
16.86 |
| 2026-10-01 00:00 |
05:50:34.64 |
-12:08:49.8 |
HIP 27509 |
15.98 |
| 2026-10-01 12:00 |
05:50:31.98 |
-12:09:43.2 |
HIP 27509 |
15.12 |
| 2026-10-02 00:00 |
05:50:29.26 |
-12:10:36.5 |
HIP 27509 |
14.27 |
| 2026-10-02 12:00 |
05:50:26.47 |
-12:11:29.7 |
HIP 27509 |
13.44 |
| 2026-10-03 00:00 |
05:50:23.61 |
-12:12:22.9 |
HIP 27509 |
12.64 |
| 2026-10-03 12:00 |
05:50:20.69 |
-12:13:16.0 |
HIP 27509 |
11.88 |
| 2026-10-04 00:00 |
05:50:17.71 |
-12:14:09.0 |
HIP 27509 |
11.17 |
| 2026-10-04 12:00 |
05:50:14.66 |
-12:15:02.0 |
HIP 27509 |
10.51 |
| 2026-10-05 00:00 |
05:50:11.54 |
-12:15:54.8 |
HIP 27509 |
9.94 |
| 2026-10-05 12:00 |
05:50:08.36 |
-12:16:47.6 |
HIP 27509 |
9.46 |
| 2026-10-06 00:00 |
05:50:05.11 |
-12:17:40.3 |
HIP 27509 |
9.09 |
| 2026-10-06 12:00 |
05:50:01.80 |
-12:18:32.9 |
HIP 27509 |
8.84 |
| 2026-10-07 00:00 |
05:49:58.42 |
-12:19:25.4 |
HIP 27509 |
8.75 |
| 2026-10-07 12:00 |
05:49:54.98 |
-12:20:17.7 |
HIP 27509 |
8.80 |
| 2026-10-08 00:00 |
05:49:51.48 |
-12:21:10.0 |
HIP 27509 |
9.02 |
| 2026-10-08 12:00 |
05:49:47.90 |
-12:22:02.1 |
HIP 27509 |
9.37 |
| 2026-10-09 00:00 |
05:49:44.27 |
-12:22:54.1 |
HIP 27509 |
9.86 |
| 2026-10-09 12:00 |
05:49:40.57 |
-12:23:46.0 |
HIP 27506 |
10.29 |
| 2026-10-10 00:00 |
05:49:36.80 |
-12:24:37.7 |
HIP 27506 |
9.20 |
| 2026-10-10 12:00 |
05:49:32.97 |
-12:25:29.3 |
HIP 27506 |
8.17 |
| 2026-10-11 00:00 |
05:49:29.08 |
-12:26:20.7 |
HIP 27506 |
7.21 |