C/2021 N3 (PANSTARRS)
| 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) |
| 2026-02-03 00:00 |
00:28:52.27 |
+22:58:31.6 |
HIP 2397 |
25.86 |
| 2026-02-03 12:00 |
00:28:58.92 |
+22:58:47.0 |
HIP 2397 |
24.66 |
| 2026-02-04 00:00 |
00:29:05.63 |
+22:59:03.0 |
HIP 2397 |
23.49 |
| 2026-02-04 12:00 |
00:29:12.38 |
+22:59:19.5 |
HIP 2397 |
22.37 |
| 2026-02-05 00:00 |
00:29:19.19 |
+22:59:36.6 |
HIP 2397 |
21.30 |
| 2026-02-05 12:00 |
00:29:26.04 |
+22:59:54.1 |
HIP 2397 |
20.29 |
| 2026-02-06 00:00 |
00:29:32.94 |
+23:00:12.1 |
HIP 2397 |
19.37 |
| 2026-02-06 12:00 |
00:29:39.90 |
+23:00:30.7 |
HIP 2397 |
18.54 |
| 2026-02-07 00:00 |
00:29:46.90 |
+23:00:49.7 |
HIP 2397 |
17.82 |
| 2026-02-07 12:00 |
00:29:53.95 |
+23:01:09.3 |
HIP 2397 |
17.24 |
| 2026-02-08 00:00 |
00:30:01.04 |
+23:01:29.4 |
HIP 2397 |
16.80 |
| 2026-02-08 12:00 |
00:30:08.19 |
+23:01:50.0 |
HIP 2397 |
16.52 |
| 2026-02-09 00:00 |
00:30:15.38 |
+23:02:11.1 |
HIP 2397 |
16.41 |
| 2026-02-09 12:00 |
00:30:22.61 |
+23:02:32.7 |
HIP 2397 |
16.49 |
| 2026-02-10 00:00 |
00:30:29.89 |
+23:02:54.8 |
HIP 2397 |
16.75 |
| 2026-02-10 12:00 |
00:30:37.22 |
+23:03:17.4 |
HIP 2397 |
17.19 |
| 2026-02-11 00:00 |
00:30:44.60 |
+23:03:40.5 |
HIP 2397 |
17.79 |
| 2026-02-11 12:00 |
00:30:52.01 |
+23:04:04.1 |
HIP 2397 |
18.55 |
| 2026-02-12 00:00 |
00:30:59.47 |
+23:04:28.3 |
HIP 2397 |
19.45 |
| 2026-02-12 12:00 |
00:31:06.98 |
+23:04:52.9 |
HIP 2397 |
20.48 |
| 2026-02-13 00:00 |
00:31:14.53 |
+23:05:18.0 |
HIP 2573 |
20.52 |
| 2026-02-13 12:00 |
00:31:22.12 |
+23:05:43.6 |
HIP 2573 |
18.73 |
| 2026-02-14 00:00 |
00:31:29.76 |
+23:06:09.7 |
HIP 2573 |
16.92 |
| 2026-02-14 12:00 |
00:31:37.43 |
+23:06:36.3 |
HIP 2573 |
15.11 |
| 2026-02-15 00:00 |
00:31:45.15 |
+23:07:03.4 |
HIP 2573 |
13.29 |
| 2026-02-15 12:00 |
00:31:52.91 |
+23:07:31.0 |
HIP 2573 |
11.45 |
| 2026-02-16 00:00 |
00:32:00.71 |
+23:07:59.0 |
HIP 2573 |
9.61 |
| 2026-02-16 12:00 |
00:32:08.55 |
+23:08:27.6 |
HIP 2573 |
7.77 |
| 2026-02-17 00:00 |
00:32:16.43 |
+23:08:56.6 |
HIP 2573 |
5.92 |
| 2026-02-17 12:00 |
00:32:24.35 |
+23:09:26.2 |
HIP 2573 |
4.09 |
| 2026-02-18 00:00 |
00:32:32.30 |
+23:09:56.2 |
HIP 2573 |
2.34 |
| 2026-02-18 12:00 |
00:32:40.30 |
+23:10:26.7 |
HIP 2573 |
1.17 |
| 2026-02-19 00:00 |
00:32:48.33 |
+23:10:57.6 |
HIP 2573 |
2.14 |
| 2026-02-19 12:00 |
00:32:56.40 |
+23:11:29.1 |
HIP 2573 |
3.89 |
| 2026-02-20 00:00 |
00:33:04.51 |
+23:12:01.0 |
HIP 2573 |
5.77 |
| 2026-02-20 12:00 |
00:33:12.65 |
+23:12:33.4 |
HIP 2573 |
7.69 |
| 2026-02-21 00:00 |
00:33:20.83 |
+23:13:06.3 |
HIP 2573 |
9.62 |
| 2026-02-21 12:00 |
00:33:29.05 |
+23:13:39.6 |
HIP 2573 |
11.58 |
| 2026-02-22 00:00 |
00:33:37.30 |
+23:14:13.4 |
HIP 2573 |
13.54 |
| 2026-02-22 12:00 |
00:33:45.58 |
+23:14:47.7 |
HIP 2573 |
15.52 |
| 2026-02-23 00:00 |
00:33:53.90 |
+23:15:22.4 |
HIP 2573 |
17.51 |
| 2026-02-23 12:00 |
00:34:02.25 |
+23:15:57.6 |
HIP 2573 |
19.51 |
| 2026-02-24 00:00 |
00:34:10.63 |
+23:16:33.3 |
HIP 2573 |
21.52 |