| 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) |
| 2026-05-12 00:00 |
04:08:08.33 |
+65:34:10.7 |
HIP 19177 |
9.72 |
| 2026-05-12 12:00 |
04:08:23.09 |
+65:34:19.7 |
HIP 19177 |
11.22 |
| 2026-05-13 00:00 |
04:08:37.88 |
+65:34:29.2 |
HIP 19177 |
12.74 |
| 2026-05-13 12:00 |
04:08:52.69 |
+65:34:39.1 |
HIP 19177 |
14.26 |
| 2026-05-14 00:00 |
04:09:07.52 |
+65:34:49.6 |
HIP 19177 |
15.80 |
| 2026-05-14 12:00 |
04:09:22.38 |
+65:35:00.6 |
HIP 19177 |
17.34 |
| 2026-05-15 00:00 |
04:09:37.25 |
+65:35:12.1 |
HIP 19177 |
18.88 |
| 2026-05-15 12:00 |
04:09:52.15 |
+65:35:24.1 |
HIP 19177 |
20.43 |
| 2026-05-16 00:00 |
04:10:07.06 |
+65:35:36.5 |
HIP 19259 |
21.58 |
| 2026-05-16 12:00 |
04:10:22.00 |
+65:35:49.5 |
HIP 19259 |
22.53 |
| 2026-05-17 00:00 |
04:10:36.95 |
+65:36:03.0 |
HIP 19259 |
23.53 |
| 2026-05-17 12:00 |
04:10:51.92 |
+65:36:17.0 |
HIP 19259 |
24.59 |
| 2026-05-18 00:00 |
04:11:06.90 |
+65:36:31.4 |
HIP 19710 |
24.08 |
| 2026-05-18 12:00 |
04:11:21.90 |
+65:36:46.4 |
HIP 19710 |
23.01 |
| 2026-05-19 00:00 |
04:11:36.91 |
+65:37:01.8 |
HIP 19710 |
21.99 |
| 2026-05-19 12:00 |
04:11:51.94 |
+65:37:17.8 |
HIP 19710 |
21.03 |
| 2026-05-20 00:00 |
04:12:06.98 |
+65:37:34.2 |
HIP 19710 |
20.14 |
| 2026-05-20 12:00 |
04:12:22.03 |
+65:37:51.1 |
HIP 19710 |
19.32 |
| 2026-05-21 00:00 |
04:12:37.09 |
+65:38:08.5 |
HIP 19710 |
18.60 |
| 2026-05-21 12:00 |
04:12:52.16 |
+65:38:26.5 |
HIP 19710 |
17.97 |
| 2026-05-22 00:00 |
04:13:07.25 |
+65:38:44.8 |
HIP 19710 |
17.46 |
| 2026-05-22 12:00 |
04:13:22.34 |
+65:39:03.7 |
HIP 19710 |
17.07 |
| 2026-05-23 00:00 |
04:13:37.44 |
+65:39:23.1 |
HIP 19710 |
16.81 |
| 2026-05-23 12:00 |
04:13:52.54 |
+65:39:42.9 |
HIP 19710 |
16.69 |
| 2026-05-24 00:00 |
04:14:07.65 |
+65:40:03.2 |
HIP 19710 |
16.71 |
| 2026-05-24 12:00 |
04:14:22.77 |
+65:40:24.0 |
HIP 19710 |
16.88 |
| 2026-05-25 00:00 |
04:14:37.90 |
+65:40:45.3 |
HIP 19710 |
17.18 |
| 2026-05-25 12:00 |
04:14:53.02 |
+65:41:07.0 |
HIP 19710 |
17.61 |
| 2026-05-26 00:00 |
04:15:08.15 |
+65:41:29.3 |
HIP 19710 |
18.17 |
| 2026-05-26 12:00 |
04:15:23.29 |
+65:41:52.0 |
HIP 19710 |
18.84 |
| 2026-05-27 00:00 |
04:15:38.42 |
+65:42:15.1 |
HIP 19710 |
19.61 |
| 2026-05-27 12:00 |
04:15:53.56 |
+65:42:38.8 |
HIP 19710 |
20.47 |
| 2026-05-28 00:00 |
04:16:08.70 |
+65:43:02.9 |
HIP 19710 |
21.41 |
| 2026-05-28 12:00 |
04:16:23.84 |
+65:43:27.5 |
HIP 19710 |
22.42 |
| 2026-05-29 00:00 |
04:16:38.98 |
+65:43:52.5 |
HIP 19710 |
23.50 |
| 2026-05-29 12:00 |
04:16:54.12 |
+65:44:18.0 |
HIP 19710 |
24.62 |
| 2026-05-30 00:00 |
04:17:09.25 |
+65:44:44.0 |
HIP 19710 |
25.79 |
| 2026-05-30 12:00 |
04:17:24.39 |
+65:45:10.4 |
HIP 19710 |
27.01 |
| 2026-05-31 00:00 |
04:17:39.52 |
+65:45:37.4 |
HIP 19710 |
28.25 |
| 2026-05-31 12:00 |
04:17:54.64 |
+65:46:04.7 |
HIP 19710 |
29.53 |
| 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 |