| Parameter |
Value |
| Designation |
C/2019 NJ3 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-10-22T02:23:32.611200Z |
| Orbit solution date (soln_date, UTC) |
2026-03-11T21:13:02Z |
| Obs used |
70 |
| NEO |
- |
| M1 |
6.600 |
| K1 |
13.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-03-25.0000000 |
| e |
1.00093598 |
| q (au) |
4.361928 |
| a (au) |
-4660.256154 |
| i (deg) |
99.435702 |
| Ω (om, deg) |
142.451880 |
| ω (w, deg) |
246.812804 |
| M (ma, deg) |
-0.000654 |
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) |
| 2026-03-26 00:00 |
09:28:00.50 |
+14:35:08.2 |
HIP 46335 |
18.30 |
| 2026-03-26 12:00 |
09:27:54.83 |
+14:36:04.1 |
HIP 46335 |
17.32 |
| 2026-03-27 00:00 |
09:27:49.22 |
+14:36:59.7 |
HIP 46335 |
16.46 |
| 2026-03-27 12:00 |
09:27:43.66 |
+14:37:54.9 |
HIP 46335 |
15.73 |
| 2026-03-28 00:00 |
09:27:38.17 |
+14:38:49.8 |
HIP 46335 |
15.16 |
| 2026-03-28 12:00 |
09:27:32.74 |
+14:39:44.4 |
HIP 46335 |
14.74 |
| 2026-03-29 00:00 |
09:27:27.37 |
+14:40:38.6 |
HIP 46335 |
14.50 |
| 2026-03-29 12:00 |
09:27:22.06 |
+14:41:32.5 |
HIP 46335 |
14.43 |
| 2026-03-30 00:00 |
09:27:16.82 |
+14:42:26.1 |
HIP 46335 |
14.53 |
| 2026-03-30 12:00 |
09:27:11.63 |
+14:43:19.3 |
HIP 46339 |
13.49 |
| 2026-03-31 00:00 |
09:27:06.51 |
+14:44:12.1 |
HIP 46339 |
12.21 |
| 2026-03-31 12:00 |
09:27:01.45 |
+14:45:04.6 |
HIP 46339 |
11.01 |
| 2026-04-01 00:00 |
09:26:56.46 |
+14:45:56.8 |
HIP 46339 |
9.89 |
| 2026-04-01 12:00 |
09:26:51.53 |
+14:46:48.7 |
HIP 46339 |
8.90 |
| 2026-04-02 00:00 |
09:26:46.66 |
+14:47:40.1 |
HIP 46339 |
8.05 |
| 2026-04-02 12:00 |
09:26:41.85 |
+14:48:31.3 |
HIP 46339 |
7.40 |
| 2026-04-03 00:00 |
09:26:37.11 |
+14:49:22.0 |
HIP 46339 |
6.99 |
| 2026-04-03 12:00 |
09:26:32.43 |
+14:50:12.5 |
HIP 46339 |
6.85 |
| 2026-04-04 00:00 |
09:26:27.82 |
+14:51:02.6 |
HIP 46339 |
6.98 |
| 2026-04-04 12:00 |
09:26:23.28 |
+14:51:52.3 |
HIP 46339 |
7.38 |
| 2026-04-05 00:00 |
09:26:18.79 |
+14:52:41.6 |
HIP 46339 |
7.98 |
| 2026-04-05 12:00 |
09:26:14.38 |
+14:53:30.7 |
HIP 46339 |
8.74 |
| 2026-04-06 00:00 |
09:26:10.03 |
+14:54:19.3 |
HIP 46339 |
9.61 |
| 2026-04-06 12:00 |
09:26:05.74 |
+14:55:07.6 |
HIP 46339 |
10.56 |
| 2026-04-07 00:00 |
09:26:01.53 |
+14:55:55.5 |
HIP 46339 |
11.56 |
| 2026-04-07 12:00 |
09:25:57.37 |
+14:56:43.1 |
HIP 46339 |
12.61 |
| 2026-04-08 00:00 |
09:25:53.29 |
+14:57:30.3 |
HIP 46339 |
13.67 |
| 2026-04-08 12:00 |
09:25:49.27 |
+14:58:17.2 |
HIP 46339 |
14.75 |
| 2026-04-09 00:00 |
09:25:45.32 |
+14:59:03.7 |
HIP 46318 |
15.49 |
| 2026-04-09 12:00 |
09:25:41.44 |
+14:59:49.8 |
HIP 46318 |
15.94 |
| 2026-04-10 00:00 |
09:25:37.62 |
+15:00:35.5 |
HIP 46318 |
16.46 |
| 2026-04-10 12:00 |
09:25:33.87 |
+15:01:20.9 |
HIP 46318 |
17.04 |
| 2026-04-11 00:00 |
09:25:30.19 |
+15:02:06.0 |
HIP 46318 |
17.65 |
| 2026-04-11 12:00 |
09:25:26.58 |
+15:02:50.6 |
HIP 46318 |
18.31 |
| 2026-04-12 00:00 |
09:25:23.04 |
+15:03:34.9 |
HIP 46318 |
19.00 |
| 2026-04-12 12:00 |
09:25:19.56 |
+15:04:18.8 |
HIP 46318 |
19.71 |
| 2026-04-13 00:00 |
09:25:16.16 |
+15:05:02.4 |
HIP 46318 |
20.45 |
| 2026-04-13 12:00 |
09:25:12.82 |
+15:05:45.5 |
HIP 46318 |
21.20 |
| 2026-04-14 00:00 |
09:25:09.55 |
+15:06:28.3 |
HIP 46318 |
21.96 |
| 2026-04-14 12:00 |
09:25:06.35 |
+15:07:10.8 |
HIP 46318 |
22.72 |
| 2026-04-15 00:00 |
09:25:03.22 |
+15:07:52.8 |
HIP 46318 |
23.49 |
| 2026-04-15 12:00 |
09:25:00.16 |
+15:08:34.5 |
HIP 46318 |
24.27 |
| 2026-04-16 00:00 |
09:24:57.17 |
+15:09:15.8 |
HIP 46318 |
25.04 |