| Parameter |
Value |
| Designation |
P/2022 B1 (Wierzchos) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-02-25T08:09:18.426240Z |
| Orbit solution date (soln_date, UTC) |
2022-05-19T21:13:41Z |
| Obs used |
77 |
| NEO |
- |
| M1 |
9.800 |
| K1 |
34.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-01-25T05:00:25.027200Z |
| Discovery magnitude (MPC) |
19.82 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-01-17.0000000 |
| e |
0.65283630 |
| q (au) |
1.896707 |
| a (au) |
5.463438 |
| i (deg) |
10.990904 |
| Ω (om, deg) |
148.849791 |
| ω (w, deg) |
325.482098 |
| M (ma, deg) |
356.963752 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.533 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.533 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2021-10-30 |
2022-02-09 |
+18.7304 |
-5.466 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
18:49:45.09 |
-13:26:28.9 |
HIP 92456 |
13.68 |
| 2026-05-12 12:00 |
18:49:38.40 |
-13:26:14.4 |
HIP 92456 |
15.17 |
| 2026-05-13 00:00 |
18:49:31.60 |
-13:26:00.2 |
HIP 92456 |
16.71 |
| 2026-05-13 12:00 |
18:49:24.69 |
-13:25:46.3 |
HIP 92456 |
18.29 |
| 2026-05-14 00:00 |
18:49:17.67 |
-13:25:32.8 |
HIP 92456 |
19.91 |
| 2026-05-14 12:00 |
18:49:10.53 |
-13:25:19.5 |
HIP 92456 |
21.57 |
| 2026-05-15 00:00 |
18:49:03.29 |
-13:25:06.5 |
HIP 92456 |
23.27 |
| 2026-05-15 12:00 |
18:48:55.94 |
-13:24:53.9 |
HIP 92456 |
25.00 |
| 2026-05-16 00:00 |
18:48:48.47 |
-13:24:41.6 |
HIP 92456 |
26.76 |
| 2026-05-16 12:00 |
18:48:40.90 |
-13:24:29.6 |
HIP 92456 |
28.56 |
| 2026-05-17 00:00 |
18:48:33.23 |
-13:24:17.9 |
HIP 92456 |
30.38 |
| 2026-05-17 12:00 |
18:48:25.44 |
-13:24:06.5 |
HIP 92323 |
31.30 |
| 2026-05-18 00:00 |
18:48:17.55 |
-13:23:55.4 |
HIP 92323 |
32.03 |
| 2026-05-18 12:00 |
18:48:09.56 |
-13:23:44.7 |
HIP 92323 |
32.86 |
| 2026-05-19 00:00 |
18:48:01.46 |
-13:23:34.3 |
HIP 92323 |
33.80 |
| 2026-05-19 12:00 |
18:47:53.26 |
-13:23:24.2 |
HIP 92323 |
34.82 |
| 2026-05-20 00:00 |
18:47:44.95 |
-13:23:14.4 |
HIP 92044 |
34.85 |
| 2026-05-20 12:00 |
18:47:36.55 |
-13:23:05.0 |
HIP 92044 |
33.17 |
| 2026-05-21 00:00 |
18:47:28.05 |
-13:22:55.9 |
HIP 92044 |
31.50 |
| 2026-05-21 12:00 |
18:47:19.44 |
-13:22:47.1 |
HIP 92022 |
29.85 |
| 2026-05-22 00:00 |
18:47:10.74 |
-13:22:38.6 |
HIP 92022 |
27.83 |
| 2026-05-22 12:00 |
18:47:01.94 |
-13:22:30.5 |
HIP 92022 |
25.80 |
| 2026-05-23 00:00 |
18:46:53.05 |
-13:22:22.7 |
HIP 92022 |
23.77 |
| 2026-05-23 12:00 |
18:46:44.06 |
-13:22:15.2 |
HIP 92022 |
21.75 |
| 2026-05-24 00:00 |
18:46:34.97 |
-13:22:08.1 |
HIP 92022 |
19.75 |
| 2026-05-24 12:00 |
18:46:25.80 |
-13:22:01.3 |
HIP 92022 |
17.79 |
| 2026-05-25 00:00 |
18:46:16.53 |
-13:21:54.8 |
HIP 92022 |
15.88 |
| 2026-05-25 12:00 |
18:46:07.16 |
-13:21:48.6 |
HIP 92022 |
14.06 |
| 2026-05-26 00:00 |
18:45:57.71 |
-13:21:42.8 |
HIP 92022 |
12.39 |
| 2026-05-26 12:00 |
18:45:48.17 |
-13:21:37.3 |
HIP 92022 |
10.94 |
| 2026-05-27 00:00 |
18:45:38.54 |
-13:21:32.1 |
HIP 92022 |
9.83 |
| 2026-05-27 12:00 |
18:45:28.83 |
-13:21:27.3 |
HIP 92022 |
9.20 |
| 2026-05-28 00:00 |
18:45:19.02 |
-13:21:22.8 |
HIP 92022 |
9.17 |
| 2026-05-28 12:00 |
18:45:09.14 |
-13:21:18.6 |
HIP 92022 |
9.75 |
| 2026-05-29 00:00 |
18:44:59.16 |
-13:21:14.8 |
HIP 92022 |
10.86 |
| 2026-05-29 12:00 |
18:44:49.11 |
-13:21:11.3 |
HIP 91929 |
10.22 |
| 2026-05-30 00:00 |
18:44:38.97 |
-13:21:08.1 |
HIP 91929 |
8.99 |
| 2026-05-30 12:00 |
18:44:28.75 |
-13:21:05.3 |
HIP 91929 |
8.34 |
| 2026-05-31 00:00 |
18:44:18.45 |
-13:21:02.8 |
HIP 91929 |
8.41 |
| 2026-05-31 12:00 |
18:44:08.08 |
-13:21:00.6 |
HIP 91929 |
9.21 |
| 2026-06-01 00:00 |
18:43:57.62 |
-13:20:58.8 |
HIP 91929 |
10.58 |
| 2026-06-01 12:00 |
18:43:47.09 |
-13:20:57.3 |
HIP 91929 |
12.35 |
| 2026-06-02 00:00 |
18:43:36.48 |
-13:20:56.1 |
HIP 91929 |
14.37 |