| Parameter |
Value |
| Designation |
C/2022 F2 (NEOWISE) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2022-03-23T11:03:25.447680Z |
| Orbit solution date (soln_date, UTC) |
2022-08-26T23:42:58Z |
| Obs used |
108 |
| NEO |
- |
| M1 |
15.800 |
| K1 |
4.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2022-03-30T17:17:39.840000Z |
| Discovery magnitude (MPC) |
17.00 R |
| Discovery observatory (MPC) |
C51 · WISE |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-04-15.0000000 |
| e |
0.93379045 |
| q (au) |
1.585007 |
| a (au) |
23.939247 |
| i (deg) |
97.293167 |
| Ω (om, deg) |
58.694002 |
| ω (w, deg) |
200.628782 |
| M (ma, deg) |
0.189661 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.560 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.560 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.848 |
| 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) |
| 2026-09-20 00:00 |
04:22:39.27 |
+06:18:04.6 |
HIP 20515 |
17.17 |
| 2026-09-20 12:00 |
04:22:35.37 |
+06:17:40.0 |
HIP 20515 |
18.22 |
| 2026-09-21 00:00 |
04:22:31.38 |
+06:17:15.3 |
HIP 20515 |
19.29 |
| 2026-09-21 12:00 |
04:22:27.32 |
+06:16:50.5 |
HIP 20515 |
20.37 |
| 2026-09-22 00:00 |
04:22:23.18 |
+06:16:25.7 |
HIP 20319 |
20.90 |
| 2026-09-22 12:00 |
04:22:18.96 |
+06:16:00.7 |
HIP 20319 |
19.78 |
| 2026-09-23 00:00 |
04:22:14.67 |
+06:15:35.7 |
HIP 20319 |
18.65 |
| 2026-09-23 12:00 |
04:22:10.30 |
+06:15:10.6 |
HIP 20319 |
17.50 |
| 2026-09-24 00:00 |
04:22:05.84 |
+06:14:45.4 |
HIP 20319 |
16.33 |
| 2026-09-24 12:00 |
04:22:01.32 |
+06:14:20.1 |
HIP 20319 |
15.16 |
| 2026-09-25 00:00 |
04:21:56.71 |
+06:13:54.8 |
HIP 20319 |
13.97 |
| 2026-09-25 12:00 |
04:21:52.03 |
+06:13:29.4 |
HIP 20319 |
12.77 |
| 2026-09-26 00:00 |
04:21:47.27 |
+06:13:04.0 |
HIP 20319 |
11.56 |
| 2026-09-26 12:00 |
04:21:42.44 |
+06:12:38.5 |
HIP 20319 |
10.34 |
| 2026-09-27 00:00 |
04:21:37.53 |
+06:12:12.9 |
HIP 20319 |
9.13 |
| 2026-09-27 12:00 |
04:21:32.54 |
+06:11:47.3 |
HIP 20319 |
7.93 |
| 2026-09-28 00:00 |
04:21:27.48 |
+06:11:21.6 |
HIP 20319 |
6.76 |
| 2026-09-28 12:00 |
04:21:22.35 |
+06:10:55.9 |
HIP 20319 |
5.65 |
| 2026-09-29 00:00 |
04:21:17.13 |
+06:10:30.1 |
HIP 20319 |
4.65 |
| 2026-09-29 12:00 |
04:21:11.85 |
+06:10:04.3 |
HIP 20319 |
3.89 |
| 2026-09-30 00:00 |
04:21:06.49 |
+06:09:38.5 |
HIP 20319 |
3.52 |
| 2026-09-30 12:00 |
04:21:01.05 |
+06:09:12.6 |
HIP 20319 |
3.70 |
| 2026-10-01 00:00 |
04:20:55.54 |
+06:08:46.7 |
HIP 20268 |
3.67 |
| 2026-10-01 12:00 |
04:20:49.96 |
+06:08:20.8 |
HIP 20268 |
2.22 |
| 2026-10-02 00:00 |
04:20:44.30 |
+06:07:54.8 |
HIP 20268 |
0.76 |
| 2026-10-02 12:00 |
04:20:38.57 |
+06:07:28.8 |
HIP 20268 |
0.77 |
| 2026-10-03 00:00 |
04:20:32.76 |
+06:07:02.8 |
HIP 20268 |
2.26 |
| 2026-10-03 12:00 |
04:20:26.89 |
+06:06:36.7 |
HIP 20268 |
3.78 |
| 2026-10-04 00:00 |
04:20:20.94 |
+06:06:10.7 |
HIP 20268 |
5.32 |
| 2026-10-04 12:00 |
04:20:14.92 |
+06:05:44.6 |
HIP 20268 |
6.88 |
| 2026-10-05 00:00 |
04:20:08.82 |
+06:05:18.6 |
HIP 20268 |
8.45 |
| 2026-10-05 12:00 |
04:20:02.66 |
+06:04:52.5 |
HIP 20268 |
10.05 |
| 2026-10-06 00:00 |
04:19:56.42 |
+06:04:26.5 |
HIP 20268 |
11.66 |
| 2026-10-06 12:00 |
04:19:50.11 |
+06:04:00.4 |
HIP 20268 |
13.28 |
| 2026-10-07 00:00 |
04:19:43.73 |
+06:03:34.4 |
HIP 20268 |
14.93 |
| 2026-10-07 12:00 |
04:19:37.29 |
+06:03:08.3 |
HIP 20268 |
16.59 |
| 2026-10-08 00:00 |
04:19:30.77 |
+06:02:42.3 |
HIP 20268 |
18.26 |
| 2026-10-08 12:00 |
04:19:24.18 |
+06:02:16.3 |
HIP 20268 |
19.96 |
| 2026-10-09 00:00 |
04:19:17.53 |
+06:01:50.3 |
HIP 20104 |
21.59 |
| 2026-10-09 12:00 |
04:19:10.80 |
+06:01:24.4 |
HIP 20104 |
20.43 |
| 2026-10-10 00:00 |
04:19:04.01 |
+06:00:58.5 |
HIP 20104 |
19.34 |
| 2026-10-10 12:00 |
04:18:57.15 |
+06:00:32.6 |
HIP 20104 |
18.35 |
| 2026-10-11 00:00 |
04:18:50.22 |
+06:00:06.7 |
HIP 20104 |
17.48 |