C/2019 NJ3 (Lemmon)
| Parameter |
Value |
| Designation |
C/2019 NJ3 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-10-22T04:20:23.625600Z |
| Orbit solution date (soln_date, UTC) |
2022-01-04T16:12:30Z |
| Obs used |
53 |
| NEO |
- |
| M1 |
6.700 |
| K1 |
13.250 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-06-16.0000000 |
| e |
1.00082891 |
| q (au) |
4.361733 |
| a (au) |
-5262.018257 |
| i (deg) |
99.437566 |
| Ω (om, deg) |
142.453529 |
| ω (w, deg) |
246.825348 |
| M (ma, deg) |
-0.000331 |
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) |
| 2026-02-03 00:00 |
09:41:08.17 |
+12:40:02.3 |
HIP 47551 |
15.75 |
| 2026-02-03 12:00 |
09:40:59.68 |
+12:41:14.9 |
HIP 47551 |
15.85 |
| 2026-02-04 00:00 |
09:40:51.17 |
+12:42:27.6 |
HIP 47551 |
16.30 |
| 2026-02-04 12:00 |
09:40:42.64 |
+12:43:40.3 |
HIP 47551 |
17.09 |
| 2026-02-05 00:00 |
09:40:34.11 |
+12:44:53.1 |
HIP 47551 |
18.16 |
| 2026-02-05 12:00 |
09:40:25.57 |
+12:46:05.9 |
HIP 47468 |
17.31 |
| 2026-02-06 00:00 |
09:40:17.03 |
+12:47:18.8 |
HIP 47468 |
16.54 |
| 2026-02-06 12:00 |
09:40:08.47 |
+12:48:31.6 |
HIP 47468 |
16.10 |
| 2026-02-07 00:00 |
09:39:59.91 |
+12:49:44.5 |
HIP 47468 |
16.01 |
| 2026-02-07 12:00 |
09:39:51.34 |
+12:50:57.4 |
HIP 47362 |
15.27 |
| 2026-02-08 00:00 |
09:39:42.77 |
+12:52:10.4 |
HIP 47362 |
14.40 |
| 2026-02-08 12:00 |
09:39:34.19 |
+12:53:23.3 |
HIP 47362 |
13.90 |
| 2026-02-09 00:00 |
09:39:25.61 |
+12:54:36.3 |
HIP 47362 |
13.81 |
| 2026-02-09 12:00 |
09:39:17.03 |
+12:55:49.2 |
HIP 47362 |
14.15 |
| 2026-02-10 00:00 |
09:39:08.44 |
+12:57:02.2 |
HIP 47362 |
14.87 |
| 2026-02-10 12:00 |
09:38:59.85 |
+12:58:15.1 |
HIP 47362 |
15.93 |
| 2026-02-11 00:00 |
09:38:51.27 |
+12:59:28.0 |
HIP 47362 |
17.27 |
| 2026-02-11 12:00 |
09:38:42.68 |
+13:00:41.0 |
HIP 47291 |
17.73 |
| 2026-02-12 00:00 |
09:38:34.10 |
+13:01:53.8 |
HIP 47291 |
18.26 |
| 2026-02-12 12:00 |
09:38:25.52 |
+13:03:06.7 |
HIP 47291 |
19.07 |
| 2026-02-13 00:00 |
09:38:16.94 |
+13:04:19.5 |
HIP 47291 |
20.15 |
| 2026-02-13 12:00 |
09:38:08.37 |
+13:05:32.3 |
HIP 47388 |
21.35 |
| 2026-02-14 00:00 |
09:37:59.80 |
+13:06:45.1 |
HIP 47388 |
22.35 |
| 2026-02-14 12:00 |
09:37:51.24 |
+13:07:57.8 |
HIP 47149 |
23.22 |
| 2026-02-15 00:00 |
09:37:42.69 |
+13:09:10.4 |
HIP 47149 |
20.81 |
| 2026-02-15 12:00 |
09:37:34.14 |
+13:10:23.0 |
HIP 47149 |
18.41 |
| 2026-02-16 00:00 |
09:37:25.60 |
+13:11:35.6 |
HIP 47149 |
16.01 |
| 2026-02-16 12:00 |
09:37:17.08 |
+13:12:48.0 |
HIP 47149 |
13.61 |
| 2026-02-17 00:00 |
09:37:08.56 |
+13:14:00.4 |
HIP 47149 |
11.22 |
| 2026-02-17 12:00 |
09:37:00.05 |
+13:15:12.8 |
HIP 47149 |
8.83 |
| 2026-02-18 00:00 |
09:36:51.56 |
+13:16:25.0 |
HIP 47149 |
6.45 |
| 2026-02-18 12:00 |
09:36:43.07 |
+13:17:37.1 |
HIP 47149 |
4.09 |
| 2026-02-19 00:00 |
09:36:34.61 |
+13:18:49.2 |
HIP 47149 |
1.81 |
| 2026-02-19 12:00 |
09:36:26.15 |
+13:20:01.2 |
HIP 47149 |
1.10 |
| 2026-02-20 00:00 |
09:36:17.72 |
+13:21:13.0 |
HIP 47149 |
3.23 |
| 2026-02-20 12:00 |
09:36:09.30 |
+13:22:24.8 |
HIP 47149 |
5.56 |
| 2026-02-21 00:00 |
09:36:00.89 |
+13:23:36.4 |
HIP 47149 |
7.91 |
| 2026-02-21 12:00 |
09:35:52.51 |
+13:24:48.0 |
HIP 47149 |
10.26 |
| 2026-02-22 00:00 |
09:35:44.14 |
+13:25:59.4 |
HIP 47149 |
12.62 |
| 2026-02-22 12:00 |
09:35:35.79 |
+13:27:10.7 |
HIP 47149 |
14.96 |
| 2026-02-23 00:00 |
09:35:27.47 |
+13:28:21.9 |
HIP 47149 |
17.31 |
| 2026-02-23 12:00 |
09:35:19.16 |
+13:29:32.9 |
HIP 47149 |
19.65 |
| 2026-02-24 00:00 |
09:35:10.88 |
+13:30:43.8 |
HIP 47149 |
21.98 |