| Parameter |
Value |
| Designation |
C/2021 N3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-08-19T14:19:37.767360Z |
| Orbit solution date (soln_date, UTC) |
2022-12-28T10:18:08Z |
| Obs used |
77 |
| NEO |
- |
| M1 |
7.200 |
| K1 |
12.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-07-13T12:22:01.401600Z |
| Discovery magnitude (MPC) |
20.56 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-04-13.0000000 |
| e |
0.96427540 |
| q (au) |
5.711157 |
| a (au) |
159.866205 |
| i (deg) |
26.748126 |
| Ω (om, deg) |
337.494113 |
| ω (w, deg) |
304.695943 |
| M (ma, deg) |
0.293248 |
Magnitude
Scatter + Global Linear
$$
M_a = (4.887 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
4.887 |
| n |
6.000 |
| gf |
0.872 |
| gb |
-0.960 |
| k |
1.000 |
| δ90 |
1.000 |
| 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) |
| 2026-07-29 00:00 |
01:07:45.52 |
+28:51:09.9 |
HIP 5339 |
6.60 |
| 2026-07-29 12:00 |
01:07:44.37 |
+28:51:57.1 |
HIP 5339 |
6.79 |
| 2026-07-30 00:00 |
01:07:43.15 |
+28:52:43.8 |
HIP 5339 |
7.08 |
| 2026-07-30 12:00 |
01:07:41.86 |
+28:53:30.1 |
HIP 5339 |
7.47 |
| 2026-07-31 00:00 |
01:07:40.49 |
+28:54:15.9 |
HIP 5339 |
7.94 |
| 2026-07-31 12:00 |
01:07:39.06 |
+28:55:01.4 |
HIP 5339 |
8.47 |
| 2026-08-01 00:00 |
01:07:37.56 |
+28:55:46.3 |
HIP 5339 |
9.06 |
| 2026-08-01 12:00 |
01:07:35.99 |
+28:56:30.9 |
HIP 5339 |
9.69 |
| 2026-08-02 00:00 |
01:07:34.35 |
+28:57:15.0 |
HIP 5339 |
10.35 |
| 2026-08-02 12:00 |
01:07:32.64 |
+28:57:58.7 |
HIP 5339 |
11.05 |
| 2026-08-03 00:00 |
01:07:30.87 |
+28:58:41.9 |
HIP 5339 |
11.77 |
| 2026-08-03 12:00 |
01:07:29.02 |
+28:59:24.6 |
HIP 5339 |
12.51 |
| 2026-08-04 00:00 |
01:07:27.10 |
+29:00:06.9 |
HIP 5339 |
13.26 |
| 2026-08-04 12:00 |
01:07:25.11 |
+29:00:48.8 |
HIP 5339 |
14.03 |
| 2026-08-05 00:00 |
01:07:23.06 |
+29:01:30.1 |
HIP 5339 |
14.82 |
| 2026-08-05 12:00 |
01:07:20.94 |
+29:02:11.1 |
HIP 5339 |
15.61 |
| 2026-08-06 00:00 |
01:07:18.74 |
+29:02:51.5 |
HIP 5339 |
16.41 |
| 2026-08-06 12:00 |
01:07:16.48 |
+29:03:31.5 |
HIP 5339 |
17.22 |
| 2026-08-07 00:00 |
01:07:14.15 |
+29:04:11.0 |
HIP 5339 |
18.04 |
| 2026-08-07 12:00 |
01:07:11.75 |
+29:04:50.1 |
HIP 5339 |
18.87 |
| 2026-08-08 00:00 |
01:07:09.29 |
+29:05:28.6 |
HIP 5339 |
19.70 |
| 2026-08-08 12:00 |
01:07:06.75 |
+29:06:06.7 |
HIP 5339 |
20.54 |
| 2026-08-09 00:00 |
01:07:04.15 |
+29:06:44.3 |
HIP 5339 |
21.38 |
| 2026-08-09 12:00 |
01:07:01.48 |
+29:07:21.4 |
HIP 5339 |
22.23 |
| 2026-08-10 00:00 |
01:06:58.74 |
+29:07:58.0 |
HIP 5339 |
23.08 |
| 2026-08-10 12:00 |
01:06:55.93 |
+29:08:34.2 |
HIP 5339 |
23.94 |
| 2026-08-11 00:00 |
01:06:53.06 |
+29:09:09.8 |
HIP 5339 |
24.81 |
| 2026-08-11 12:00 |
01:06:50.12 |
+29:09:44.9 |
HIP 5339 |
25.67 |
| 2026-08-12 00:00 |
01:06:47.12 |
+29:10:19.6 |
HIP 5339 |
26.55 |
| 2026-08-12 12:00 |
01:06:44.04 |
+29:10:53.7 |
HIP 5339 |
27.43 |
| 2026-08-13 00:00 |
01:06:40.91 |
+29:11:27.3 |
HIP 5339 |
28.31 |
| 2026-08-13 12:00 |
01:06:37.70 |
+29:12:00.5 |
HIP 5339 |
29.20 |
| 2026-08-14 00:00 |
01:06:34.43 |
+29:12:33.1 |
HIP 5212 |
29.23 |
| 2026-08-14 12:00 |
01:06:31.10 |
+29:13:05.2 |
HIP 5212 |
28.73 |
| 2026-08-15 00:00 |
01:06:27.70 |
+29:13:36.8 |
HIP 5212 |
28.25 |
| 2026-08-15 12:00 |
01:06:24.23 |
+29:14:07.9 |
HIP 5212 |
27.81 |
| 2026-08-16 00:00 |
01:06:20.70 |
+29:14:38.4 |
HIP 5212 |
27.40 |
| 2026-08-16 12:00 |
01:06:17.11 |
+29:15:08.4 |
HIP 5212 |
27.03 |
| 2026-08-17 00:00 |
01:06:13.45 |
+29:15:38.0 |
HIP 5212 |
26.70 |
| 2026-08-17 12:00 |
01:06:09.73 |
+29:16:07.0 |
HIP 5212 |
26.40 |
| 2026-08-18 00:00 |
01:06:05.95 |
+29:16:35.4 |
HIP 5212 |
26.15 |
| 2026-08-18 12:00 |
01:06:02.11 |
+29:17:03.4 |
HIP 5212 |
25.95 |
| 2026-08-19 00:00 |
01:05:58.20 |
+29:17:30.8 |
HIP 5212 |
25.79 |