| 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) |
| 2026-06-01 00:00 |
04:18:09.77 |
+65:46:32.6 |
HIP 19710 |
30.84 |
| 2026-06-01 12:00 |
04:18:24.88 |
+65:47:00.8 |
HIP 20119 |
32.01 |
| 2026-06-02 00:00 |
04:18:40.00 |
+65:47:29.6 |
HIP 20119 |
32.40 |
| 2026-06-02 12:00 |
04:18:55.10 |
+65:47:58.8 |
HIP 20119 |
32.87 |
| 2026-06-03 00:00 |
04:19:10.20 |
+65:48:28.5 |
HIP 20119 |
33.43 |
| 2026-06-03 12:00 |
04:19:25.29 |
+65:48:58.6 |
HIP 20119 |
34.06 |
| 2026-06-04 00:00 |
04:19:40.37 |
+65:49:29.2 |
HIP 20119 |
34.76 |
| 2026-06-04 12:00 |
04:19:55.45 |
+65:50:00.2 |
HIP 20119 |
35.54 |
| 2026-06-05 00:00 |
04:20:10.51 |
+65:50:31.7 |
HIP 20119 |
36.38 |
| 2026-06-05 12:00 |
04:20:25.57 |
+65:51:03.6 |
HIP 20119 |
37.27 |
| 2026-06-06 00:00 |
04:20:40.61 |
+65:51:36.0 |
HIP 20435 |
37.97 |
| 2026-06-06 12:00 |
04:20:55.64 |
+65:52:08.8 |
HIP 20435 |
36.99 |
| 2026-06-07 00:00 |
04:21:10.66 |
+65:52:42.1 |
HIP 20435 |
36.06 |
| 2026-06-07 12:00 |
04:21:25.66 |
+65:53:15.8 |
HIP 20435 |
35.17 |
| 2026-06-08 00:00 |
04:21:40.65 |
+65:53:50.0 |
HIP 20435 |
34.33 |
| 2026-06-08 12:00 |
04:21:55.63 |
+65:54:24.6 |
HIP 20435 |
33.53 |
| 2026-06-09 00:00 |
04:22:10.59 |
+65:54:59.7 |
HIP 20435 |
32.79 |
| 2026-06-09 12:00 |
04:22:25.54 |
+65:55:35.2 |
HIP 20435 |
32.11 |
| 2026-06-10 00:00 |
04:22:40.47 |
+65:56:11.2 |
HIP 20435 |
31.49 |
| 2026-06-10 12:00 |
04:22:55.38 |
+65:56:47.6 |
HIP 20435 |
30.93 |
| 2026-06-11 00:00 |
04:23:10.27 |
+65:57:24.4 |
HIP 20435 |
30.45 |
| 2026-06-11 12:00 |
04:23:25.14 |
+65:58:01.7 |
HIP 20435 |
30.03 |
| 2026-06-12 00:00 |
04:23:40.00 |
+65:58:39.4 |
HIP 20435 |
29.69 |
| 2026-06-12 12:00 |
04:23:54.83 |
+65:59:17.6 |
HIP 20435 |
29.43 |
| 2026-06-13 00:00 |
04:24:09.64 |
+65:59:56.2 |
HIP 20435 |
29.25 |
| 2026-06-13 12:00 |
04:24:24.43 |
+66:00:35.2 |
HIP 20435 |
29.15 |
| 2026-06-14 00:00 |
04:24:39.20 |
+66:01:14.7 |
HIP 20435 |
29.13 |
| 2026-06-14 12:00 |
04:24:53.94 |
+66:01:54.6 |
HIP 20435 |
29.19 |
| 2026-06-15 00:00 |
04:25:08.66 |
+66:02:34.9 |
HIP 20435 |
29.34 |
| 2026-06-15 12:00 |
04:25:23.35 |
+66:03:15.7 |
HIP 20991 |
29.00 |
| 2026-06-16 00:00 |
04:25:38.01 |
+66:03:56.9 |
HIP 20991 |
27.41 |
| 2026-06-16 12:00 |
04:25:52.65 |
+66:04:38.5 |
HIP 20991 |
25.83 |
| 2026-06-17 00:00 |
04:26:07.26 |
+66:05:20.6 |
HIP 20991 |
24.26 |
| 2026-06-17 12:00 |
04:26:21.84 |
+66:06:03.0 |
HIP 20991 |
22.71 |
| 2026-06-18 00:00 |
04:26:36.39 |
+66:06:45.9 |
HIP 20991 |
21.17 |
| 2026-06-18 12:00 |
04:26:50.91 |
+66:07:29.2 |
HIP 20991 |
19.65 |
| 2026-06-19 00:00 |
04:27:05.40 |
+66:08:13.0 |
HIP 20991 |
18.15 |
| 2026-06-19 12:00 |
04:27:19.85 |
+66:08:57.1 |
HIP 20991 |
16.69 |
| 2026-06-20 00:00 |
04:27:34.28 |
+66:09:41.7 |
HIP 20991 |
15.27 |
| 2026-06-20 12:00 |
04:27:48.66 |
+66:10:26.7 |
HIP 20991 |
13.90 |
| 2026-06-21 00:00 |
04:28:03.02 |
+66:11:12.1 |
HIP 20991 |
12.60 |
| 2026-06-21 12:00 |
04:28:17.34 |
+66:11:57.9 |
HIP 20991 |
11.39 |
| 2026-06-22 00:00 |
04:28:31.62 |
+66:12:44.1 |
HIP 20991 |
10.31 |