| 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 |
-0.502 |
| 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) |
| 2026-05-12 00:00 |
05:33:26.72 |
-10:57:30.2 |
HIP 26102 |
8.98 |
| 2026-05-12 12:00 |
05:33:31.79 |
-10:56:43.7 |
HIP 26102 |
8.09 |
| 2026-05-13 00:00 |
05:33:36.89 |
-10:55:57.6 |
HIP 26102 |
7.38 |
| 2026-05-13 12:00 |
05:33:42.02 |
-10:55:12.0 |
HIP 26102 |
6.90 |
| 2026-05-14 00:00 |
05:33:47.18 |
-10:54:26.9 |
HIP 26102 |
6.71 |
| 2026-05-14 12:00 |
05:33:52.37 |
-10:53:42.2 |
HIP 26102 |
6.83 |
| 2026-05-15 00:00 |
05:33:57.59 |
-10:52:58.0 |
HIP 26102 |
7.24 |
| 2026-05-15 12:00 |
05:34:02.83 |
-10:52:14.2 |
HIP 26102 |
7.91 |
| 2026-05-16 00:00 |
05:34:08.10 |
-10:51:30.9 |
HIP 26102 |
8.77 |
| 2026-05-16 12:00 |
05:34:13.40 |
-10:50:48.0 |
HIP 26102 |
9.77 |
| 2026-05-17 00:00 |
05:34:18.72 |
-10:50:05.7 |
HIP 26102 |
10.88 |
| 2026-05-17 12:00 |
05:34:24.07 |
-10:49:23.7 |
HIP 26102 |
12.07 |
| 2026-05-18 00:00 |
05:34:29.44 |
-10:48:42.3 |
HIP 26102 |
13.31 |
| 2026-05-18 12:00 |
05:34:34.84 |
-10:48:01.3 |
HIP 26102 |
14.60 |
| 2026-05-19 00:00 |
05:34:40.26 |
-10:47:20.8 |
HIP 26102 |
15.92 |
| 2026-05-19 12:00 |
05:34:45.70 |
-10:46:40.7 |
HIP 26148 |
17.13 |
| 2026-05-20 00:00 |
05:34:51.17 |
-10:46:01.2 |
HIP 26148 |
16.88 |
| 2026-05-20 12:00 |
05:34:56.66 |
-10:45:22.1 |
HIP 26148 |
16.77 |
| 2026-05-21 00:00 |
05:35:02.17 |
-10:44:43.4 |
HIP 26148 |
16.81 |
| 2026-05-21 12:00 |
05:35:07.71 |
-10:44:05.3 |
HIP 26148 |
16.98 |
| 2026-05-22 00:00 |
05:35:13.26 |
-10:43:27.6 |
HIP 26148 |
17.30 |
| 2026-05-22 12:00 |
05:35:18.84 |
-10:42:50.4 |
HIP 26148 |
17.74 |
| 2026-05-23 00:00 |
05:35:24.43 |
-10:42:13.7 |
HIP 26148 |
18.31 |
| 2026-05-23 12:00 |
05:35:30.05 |
-10:41:37.4 |
HIP 26148 |
18.99 |
| 2026-05-24 00:00 |
05:35:35.68 |
-10:41:01.7 |
HIP 26349 |
18.94 |
| 2026-05-24 12:00 |
05:35:41.33 |
-10:40:26.4 |
HIP 26349 |
17.47 |
| 2026-05-25 00:00 |
05:35:47.00 |
-10:39:51.6 |
HIP 26349 |
16.01 |
| 2026-05-25 12:00 |
05:35:52.69 |
-10:39:17.2 |
HIP 26349 |
14.57 |
| 2026-05-26 00:00 |
05:35:58.40 |
-10:38:43.4 |
HIP 26349 |
13.14 |
| 2026-05-26 12:00 |
05:36:04.12 |
-10:38:10.0 |
HIP 26349 |
11.73 |
| 2026-05-27 00:00 |
05:36:09.86 |
-10:37:37.1 |
HIP 26349 |
10.36 |
| 2026-05-27 12:00 |
05:36:15.61 |
-10:37:04.7 |
HIP 26349 |
9.04 |
| 2026-05-28 00:00 |
05:36:21.39 |
-10:36:32.8 |
HIP 26349 |
7.79 |
| 2026-05-28 12:00 |
05:36:27.17 |
-10:36:01.3 |
HIP 26349 |
6.66 |
| 2026-05-29 00:00 |
05:36:32.97 |
-10:35:30.3 |
HIP 26349 |
5.71 |
| 2026-05-29 12:00 |
05:36:38.79 |
-10:34:59.8 |
HIP 26349 |
5.06 |
| 2026-05-30 00:00 |
05:36:44.62 |
-10:34:29.8 |
HIP 26349 |
4.83 |
| 2026-05-30 12:00 |
05:36:50.46 |
-10:34:00.3 |
HIP 26349 |
5.07 |
| 2026-05-31 00:00 |
05:36:56.32 |
-10:33:31.3 |
HIP 26349 |
5.73 |
| 2026-05-31 12:00 |
05:37:02.19 |
-10:33:02.7 |
HIP 26349 |
6.68 |
| 2026-06-01 00:00 |
05:37:08.07 |
-10:32:34.7 |
HIP 26349 |
7.81 |
| 2026-06-01 12:00 |
05:37:13.96 |
-10:32:07.1 |
HIP 26349 |
9.07 |
| 2026-06-02 00:00 |
05:37:19.87 |
-10:31:40.0 |
HIP 26349 |
10.40 |