| Parameter |
Value |
| Designation |
C/2019 K1 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-02-12T20:54:28.042560Z |
| Orbit solution date (soln_date, UTC) |
2022-07-19T01:12:15Z |
| Obs used |
274 |
| NEO |
- |
| M1 |
13.200 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-05-16T11:34:46.531200Z |
| Discovery magnitude (MPC) |
17.18 o |
| Discovery observatory (MPC) |
T08 · ATLAS-MLO, Mauna Loa |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-06-12.0000000 |
| e |
1.00056186 |
| q (au) |
2.012738 |
| a (au) |
-3582.254853 |
| i (deg) |
87.157348 |
| Ω (om, deg) |
73.377584 |
| ω (w, deg) |
265.682376 |
| M (ma, deg) |
-0.001130 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.125 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.125 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.684 |
| k |
0.800 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
04:48:46.31 |
+69:47:06.9 |
HIP 22371 |
1.29 |
| 2026-09-20 12:00 |
04:48:41.21 |
+69:48:26.0 |
HIP 22371 |
2.58 |
| 2026-09-21 00:00 |
04:48:35.94 |
+69:49:44.9 |
HIP 22371 |
3.95 |
| 2026-09-21 12:00 |
04:48:30.50 |
+69:51:03.6 |
HIP 22371 |
5.33 |
| 2026-09-22 00:00 |
04:48:24.89 |
+69:52:22.0 |
HIP 22371 |
6.72 |
| 2026-09-22 12:00 |
04:48:19.11 |
+69:53:40.2 |
HIP 22371 |
8.11 |
| 2026-09-23 00:00 |
04:48:13.16 |
+69:54:58.3 |
HIP 22371 |
9.50 |
| 2026-09-23 12:00 |
04:48:07.04 |
+69:56:16.1 |
HIP 22371 |
10.90 |
| 2026-09-24 00:00 |
04:48:00.74 |
+69:57:33.6 |
HIP 22371 |
12.30 |
| 2026-09-24 12:00 |
04:47:54.28 |
+69:58:50.9 |
HIP 22371 |
13.71 |
| 2026-09-25 00:00 |
04:47:47.64 |
+70:00:08.0 |
HIP 22371 |
15.11 |
| 2026-09-25 12:00 |
04:47:40.84 |
+70:01:24.8 |
HIP 22119 |
16.04 |
| 2026-09-26 00:00 |
04:47:33.86 |
+70:02:41.4 |
HIP 22119 |
16.65 |
| 2026-09-26 12:00 |
04:47:26.71 |
+70:03:57.6 |
HIP 22119 |
17.34 |
| 2026-09-27 00:00 |
04:47:19.39 |
+70:05:13.7 |
HIP 22119 |
18.10 |
| 2026-09-27 12:00 |
04:47:11.90 |
+70:06:29.4 |
HIP 22119 |
18.93 |
| 2026-09-28 00:00 |
04:47:04.24 |
+70:07:44.9 |
HIP 22119 |
19.82 |
| 2026-09-28 12:00 |
04:46:56.40 |
+70:09:00.0 |
HIP 22119 |
20.75 |
| 2026-09-29 00:00 |
04:46:48.40 |
+70:10:14.9 |
HIP 22119 |
21.73 |
| 2026-09-29 12:00 |
04:46:40.22 |
+70:11:29.5 |
HIP 22345 |
22.52 |
| 2026-09-30 00:00 |
04:46:31.86 |
+70:12:43.7 |
HIP 22345 |
21.76 |
| 2026-09-30 12:00 |
04:46:23.34 |
+70:13:57.7 |
HIP 22345 |
21.08 |
| 2026-10-01 00:00 |
04:46:14.65 |
+70:15:11.3 |
HIP 22345 |
20.49 |
| 2026-10-01 12:00 |
04:46:05.78 |
+70:16:24.6 |
HIP 22345 |
19.99 |
| 2026-10-02 00:00 |
04:45:56.74 |
+70:17:37.6 |
HIP 22345 |
19.60 |
| 2026-10-02 12:00 |
04:45:47.52 |
+70:18:50.2 |
HIP 22345 |
19.32 |
| 2026-10-03 00:00 |
04:45:38.14 |
+70:20:02.5 |
HIP 22345 |
19.16 |
| 2026-10-03 12:00 |
04:45:28.58 |
+70:21:14.4 |
HIP 22345 |
19.12 |
| 2026-10-04 00:00 |
04:45:18.86 |
+70:22:25.9 |
HIP 22345 |
19.21 |
| 2026-10-04 12:00 |
04:45:08.95 |
+70:23:37.1 |
HIP 22345 |
19.41 |
| 2026-10-05 00:00 |
04:44:58.88 |
+70:24:47.9 |
HIP 22345 |
19.74 |
| 2026-10-05 12:00 |
04:44:48.64 |
+70:25:58.4 |
HIP 22345 |
20.18 |
| 2026-10-06 00:00 |
04:44:38.22 |
+70:27:08.4 |
HIP 22345 |
20.72 |
| 2026-10-06 12:00 |
04:44:27.64 |
+70:28:18.0 |
HIP 22345 |
21.36 |
| 2026-10-07 00:00 |
04:44:16.88 |
+70:29:27.3 |
HIP 22345 |
22.10 |
| 2026-10-07 12:00 |
04:44:05.95 |
+70:30:36.1 |
HIP 22345 |
22.92 |
| 2026-10-08 00:00 |
04:43:54.85 |
+70:31:44.5 |
HIP 22345 |
23.81 |
| 2026-10-08 12:00 |
04:43:43.58 |
+70:32:52.5 |
HIP 22345 |
24.77 |
| 2026-10-09 00:00 |
04:43:32.15 |
+70:34:00.1 |
HIP 22345 |
25.79 |
| 2026-10-09 12:00 |
04:43:20.54 |
+70:35:07.2 |
HIP 22345 |
26.86 |
| 2026-10-10 00:00 |
04:43:08.77 |
+70:36:13.8 |
HIP 22345 |
27.98 |
| 2026-10-10 12:00 |
04:42:56.82 |
+70:37:20.0 |
HIP 22345 |
29.14 |
| 2026-10-11 00:00 |
04:42:44.71 |
+70:38:25.8 |
HIP 22345 |
30.35 |