| Parameter |
Value |
| Designation |
C/2019 JU6 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-06-01T01:29:57.295680Z |
| Orbit solution date (soln_date, UTC) |
2022-06-20T23:12:34Z |
| Obs used |
76 |
| NEO |
- |
| M1 |
14.500 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-05-19.0000000 |
| e |
0.99939729 |
| q (au) |
2.045767 |
| a (au) |
3394.271759 |
| i (deg) |
148.291676 |
| Ω (om, deg) |
21.701965 |
| ω (w, deg) |
94.917780 |
| M (ma, deg) |
359.999935 |
Magnitude
Scatter + Global Linear
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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 |
09:35:21.77 |
-12:09:49.9 |
HIP 47007 |
7.87 |
| 2026-09-20 12:00 |
09:35:25.65 |
-12:10:33.4 |
HIP 47007 |
8.98 |
| 2026-09-21 00:00 |
09:35:29.51 |
-12:11:17.2 |
HIP 47007 |
10.11 |
| 2026-09-21 12:00 |
09:35:33.33 |
-12:12:01.0 |
HIP 47007 |
11.25 |
| 2026-09-22 00:00 |
09:35:37.13 |
-12:12:45.0 |
HIP 47007 |
12.39 |
| 2026-09-22 12:00 |
09:35:40.90 |
-12:13:29.2 |
HIP 47007 |
13.54 |
| 2026-09-23 00:00 |
09:35:44.64 |
-12:14:13.4 |
HIP 47007 |
14.68 |
| 2026-09-23 12:00 |
09:35:48.35 |
-12:14:57.8 |
HIP 47007 |
15.82 |
| 2026-09-24 00:00 |
09:35:52.03 |
-12:15:42.4 |
HIP 47007 |
16.96 |
| 2026-09-24 12:00 |
09:35:55.69 |
-12:16:27.0 |
HIP 47007 |
18.10 |
| 2026-09-25 00:00 |
09:35:59.31 |
-12:17:11.8 |
HIP 47007 |
19.24 |
| 2026-09-25 12:00 |
09:36:02.90 |
-12:17:56.7 |
HIP 47007 |
20.37 |
| 2026-09-26 00:00 |
09:36:06.46 |
-12:18:41.8 |
HIP 47007 |
21.50 |
| 2026-09-26 12:00 |
09:36:09.99 |
-12:19:26.9 |
HIP 47007 |
22.63 |
| 2026-09-27 00:00 |
09:36:13.49 |
-12:20:12.2 |
HIP 47007 |
23.75 |
| 2026-09-27 12:00 |
09:36:16.96 |
-12:20:57.5 |
HIP 47007 |
24.87 |
| 2026-09-28 00:00 |
09:36:20.40 |
-12:21:43.0 |
HIP 47007 |
25.98 |
| 2026-09-28 12:00 |
09:36:23.80 |
-12:22:28.6 |
HIP 47007 |
27.09 |
| 2026-09-29 00:00 |
09:36:27.17 |
-12:23:14.3 |
HIP 47007 |
28.20 |
| 2026-09-29 12:00 |
09:36:30.51 |
-12:24:00.1 |
HIP 47007 |
29.30 |
| 2026-09-30 00:00 |
09:36:33.82 |
-12:24:46.0 |
HIP 47007 |
30.39 |
| 2026-09-30 12:00 |
09:36:37.09 |
-12:25:31.9 |
HIP 47086 |
31.47 |
| 2026-10-01 00:00 |
09:36:40.33 |
-12:26:18.0 |
HIP 47086 |
32.49 |
| 2026-10-01 12:00 |
09:36:43.54 |
-12:27:04.2 |
HIP 47086 |
33.52 |
| 2026-10-02 00:00 |
09:36:46.71 |
-12:27:50.4 |
HIP 47086 |
34.55 |
| 2026-10-02 12:00 |
09:36:49.85 |
-12:28:36.8 |
HIP 47086 |
35.58 |
| 2026-10-03 00:00 |
09:36:52.95 |
-12:29:23.2 |
HIP 47086 |
36.61 |
| 2026-10-03 12:00 |
09:36:56.02 |
-12:30:09.7 |
HIP 47086 |
37.64 |
| 2026-10-04 00:00 |
09:36:59.06 |
-12:30:56.3 |
HIP 47086 |
38.68 |
| 2026-10-04 12:00 |
09:37:02.05 |
-12:31:43.0 |
HIP 47086 |
39.71 |
| 2026-10-05 00:00 |
09:37:05.02 |
-12:32:29.7 |
HIP 47086 |
40.74 |
| 2026-10-05 12:00 |
09:37:07.94 |
-12:33:16.5 |
HIP 47086 |
41.76 |
| 2026-10-06 00:00 |
09:37:10.83 |
-12:34:03.3 |
HIP 47086 |
42.79 |
| 2026-10-06 12:00 |
09:37:13.68 |
-12:34:50.3 |
HIP 47235 |
43.46 |
| 2026-10-07 00:00 |
09:37:16.50 |
-12:35:37.3 |
HIP 47235 |
42.59 |
| 2026-10-07 12:00 |
09:37:19.28 |
-12:36:24.3 |
HIP 47235 |
41.73 |
| 2026-10-08 00:00 |
09:37:22.02 |
-12:37:11.4 |
HIP 47235 |
40.87 |
| 2026-10-08 12:00 |
09:37:24.72 |
-12:37:58.5 |
HIP 47235 |
40.03 |
| 2026-10-09 00:00 |
09:37:27.38 |
-12:38:45.7 |
HIP 47235 |
39.19 |
| 2026-10-09 12:00 |
09:37:30.01 |
-12:39:32.9 |
HIP 47235 |
38.36 |
| 2026-10-10 00:00 |
09:37:32.59 |
-12:40:20.2 |
HIP 47235 |
37.54 |
| 2026-10-10 12:00 |
09:37:35.14 |
-12:41:07.5 |
HIP 47235 |
36.73 |
| 2026-10-11 00:00 |
09:37:37.65 |
-12:41:54.8 |
HIP 47235 |
35.93 |