| Parameter |
Value |
| Designation |
C/2019 Q1 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-07-19T15:31:26.172480Z |
| Orbit solution date (soln_date, UTC) |
2024-03-12T13:12:25Z |
| Obs used |
248 |
| NEO |
- |
| M1 |
13.900 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-08-28T09:37:41.952000Z |
| Discovery magnitude (MPC) |
20.60 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-04-08.0000000 |
| e |
1.00092868 |
| q (au) |
4.997085 |
| a (au) |
-5380.822928 |
| i (deg) |
155.721870 |
| Ω (om, deg) |
42.338664 |
| ω (w, deg) |
55.917769 |
| M (ma, deg) |
-0.000256 |
Magnitude
Scatter + Global Linear
$$
M_a = (17.131 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
17.131 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.790 |
| 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) |
| 2026-03-26 00:00 |
15:57:20.57 |
-13:39:26.9 |
HIP 78096 |
9.84 |
| 2026-03-26 12:00 |
15:57:13.91 |
-13:39:05.5 |
HIP 78096 |
8.27 |
| 2026-03-27 00:00 |
15:57:07.19 |
-13:38:43.9 |
HIP 78096 |
6.74 |
| 2026-03-27 12:00 |
15:57:00.40 |
-13:38:22.2 |
HIP 78096 |
5.27 |
| 2026-03-28 00:00 |
15:56:53.55 |
-13:38:00.4 |
HIP 78096 |
3.98 |
| 2026-03-28 12:00 |
15:56:46.64 |
-13:37:38.4 |
HIP 78096 |
3.11 |
| 2026-03-29 00:00 |
15:56:39.66 |
-13:37:16.3 |
HIP 78096 |
3.07 |
| 2026-03-29 12:00 |
15:56:32.62 |
-13:36:54.1 |
HIP 78096 |
3.91 |
| 2026-03-30 00:00 |
15:56:25.51 |
-13:36:31.7 |
HIP 78096 |
5.24 |
| 2026-03-30 12:00 |
15:56:18.35 |
-13:36:09.3 |
HIP 78096 |
6.79 |
| 2026-03-31 00:00 |
15:56:11.12 |
-13:35:46.7 |
HIP 78096 |
8.44 |
| 2026-03-31 12:00 |
15:56:03.83 |
-13:35:24.0 |
HIP 78096 |
10.16 |
| 2026-04-01 00:00 |
15:55:56.49 |
-13:35:01.2 |
HIP 78096 |
11.91 |
| 2026-04-01 12:00 |
15:55:49.08 |
-13:34:38.3 |
HIP 78096 |
13.71 |
| 2026-04-02 00:00 |
15:55:41.61 |
-13:34:15.2 |
HIP 78096 |
15.52 |
| 2026-04-02 12:00 |
15:55:34.08 |
-13:33:52.1 |
HIP 77904 |
15.74 |
| 2026-04-03 00:00 |
15:55:26.49 |
-13:33:28.8 |
HIP 77904 |
14.31 |
| 2026-04-03 12:00 |
15:55:18.85 |
-13:33:05.4 |
HIP 77904 |
13.00 |
| 2026-04-04 00:00 |
15:55:11.14 |
-13:32:41.9 |
HIP 77904 |
11.83 |
| 2026-04-04 12:00 |
15:55:03.38 |
-13:32:18.3 |
HIP 77904 |
10.88 |
| 2026-04-05 00:00 |
15:54:55.56 |
-13:31:54.7 |
HIP 77904 |
10.19 |
| 2026-04-05 12:00 |
15:54:47.69 |
-13:31:30.9 |
HIP 77904 |
9.84 |
| 2026-04-06 00:00 |
15:54:39.76 |
-13:31:07.0 |
HIP 77904 |
9.88 |
| 2026-04-06 12:00 |
15:54:31.77 |
-13:30:43.0 |
HIP 77904 |
10.30 |
| 2026-04-07 00:00 |
15:54:23.73 |
-13:30:18.9 |
HIP 77904 |
11.07 |
| 2026-04-07 12:00 |
15:54:15.63 |
-13:29:54.8 |
HIP 77904 |
12.13 |
| 2026-04-08 00:00 |
15:54:07.48 |
-13:29:30.5 |
HIP 77812 |
11.73 |
| 2026-04-08 12:00 |
15:53:59.27 |
-13:29:06.2 |
HIP 77812 |
9.90 |
| 2026-04-09 00:00 |
15:53:51.02 |
-13:28:41.7 |
HIP 77812 |
8.15 |
| 2026-04-09 12:00 |
15:53:42.71 |
-13:28:17.2 |
HIP 77812 |
6.57 |
| 2026-04-10 00:00 |
15:53:34.34 |
-13:27:52.6 |
HIP 77812 |
5.32 |
| 2026-04-10 12:00 |
15:53:25.93 |
-13:27:27.9 |
HIP 77812 |
4.70 |
| 2026-04-11 00:00 |
15:53:17.46 |
-13:27:03.2 |
HIP 77812 |
4.96 |
| 2026-04-11 12:00 |
15:53:08.95 |
-13:26:38.3 |
HIP 77812 |
5.99 |
| 2026-04-12 00:00 |
15:53:00.38 |
-13:26:13.4 |
HIP 77812 |
7.51 |
| 2026-04-12 12:00 |
15:52:51.77 |
-13:25:48.5 |
HIP 77812 |
9.27 |
| 2026-04-13 00:00 |
15:52:43.10 |
-13:25:23.4 |
HIP 77812 |
11.18 |
| 2026-04-13 12:00 |
15:52:34.39 |
-13:24:58.3 |
HIP 77812 |
13.17 |
| 2026-04-14 00:00 |
15:52:25.63 |
-13:24:33.1 |
HIP 77812 |
15.21 |
| 2026-04-14 12:00 |
15:52:16.82 |
-13:24:07.9 |
HIP 77812 |
17.30 |
| 2026-04-15 00:00 |
15:52:07.97 |
-13:23:42.6 |
HIP 77812 |
19.42 |
| 2026-04-15 12:00 |
15:51:59.07 |
-13:23:17.2 |
HIP 77609 |
19.34 |
| 2026-04-16 00:00 |
15:51:50.13 |
-13:22:51.8 |
HIP 77609 |
17.18 |