C/2022 B4
| Parameter |
Value |
| Designation |
C/2022 B4 |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2022-01-29T21:29:47.313600Z |
| Orbit solution date (soln_date, UTC) |
2022-04-14T14:49:33Z |
| Obs used |
128 |
| NEO |
- |
| M1 |
21.700 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-01-29T11:09:26.064000Z |
| Discovery magnitude (MPC) |
20.81 G |
| Discovery observatory (MPC) |
V00 · Kitt Peak-Bok |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-02-26.0000000 |
| e |
0.99639588 |
| q (au) |
1.379643 |
| a (au) |
382.796465 |
| i (deg) |
20.043251 |
| Ω (om, deg) |
340.661761 |
| ω (w, deg) |
152.955070 |
| M (ma, deg) |
0.003567 |
Magnitude
Scatter + Global Linear
$$
M_a = (20.000 + 5.943\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
20.000 |
| n |
5.943 |
| gf |
1.000 |
| gb |
-0.814 |
| k |
0.994 |
| 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) |
| 2026-02-03 00:00 |
18:48:35.34 |
-40:03:51.0 |
HIP 92226 |
22.69 |
| 2026-02-03 12:00 |
18:48:46.23 |
-40:03:59.6 |
HIP 92421 |
21.51 |
| 2026-02-04 00:00 |
18:48:57.06 |
-40:04:08.6 |
HIP 92421 |
20.22 |
| 2026-02-04 12:00 |
18:49:07.84 |
-40:04:17.8 |
HIP 92421 |
19.09 |
| 2026-02-05 00:00 |
18:49:18.57 |
-40:04:27.3 |
HIP 92421 |
18.13 |
| 2026-02-05 12:00 |
18:49:29.24 |
-40:04:37.0 |
HIP 92421 |
17.37 |
| 2026-02-06 00:00 |
18:49:39.87 |
-40:04:47.0 |
HIP 92421 |
16.84 |
| 2026-02-06 12:00 |
18:49:50.44 |
-40:04:57.3 |
HIP 92421 |
16.55 |
| 2026-02-07 00:00 |
18:50:00.95 |
-40:05:07.9 |
HIP 92421 |
16.52 |
| 2026-02-07 12:00 |
18:50:11.41 |
-40:05:18.7 |
HIP 92421 |
16.73 |
| 2026-02-08 00:00 |
18:50:21.82 |
-40:05:29.8 |
HIP 92421 |
17.18 |
| 2026-02-08 12:00 |
18:50:32.16 |
-40:05:41.2 |
HIP 92534 |
17.70 |
| 2026-02-09 00:00 |
18:50:42.46 |
-40:05:52.8 |
HIP 92534 |
16.81 |
| 2026-02-09 12:00 |
18:50:52.69 |
-40:06:04.8 |
HIP 92534 |
16.12 |
| 2026-02-10 00:00 |
18:51:02.87 |
-40:06:17.0 |
HIP 92534 |
15.66 |
| 2026-02-10 12:00 |
18:51:12.99 |
-40:06:29.4 |
HIP 92534 |
15.44 |
| 2026-02-11 00:00 |
18:51:23.05 |
-40:06:42.2 |
HIP 92534 |
15.47 |
| 2026-02-11 12:00 |
18:51:33.05 |
-40:06:55.2 |
HIP 92534 |
15.75 |
| 2026-02-12 00:00 |
18:51:42.99 |
-40:07:08.5 |
HIP 92534 |
16.25 |
| 2026-02-12 12:00 |
18:51:52.87 |
-40:07:22.0 |
HIP 92534 |
16.96 |
| 2026-02-13 00:00 |
18:52:02.69 |
-40:07:35.9 |
HIP 92534 |
17.84 |
| 2026-02-13 12:00 |
18:52:12.44 |
-40:07:50.0 |
HIP 92534 |
18.88 |
| 2026-02-14 00:00 |
18:52:22.13 |
-40:08:04.3 |
HIP 92534 |
20.03 |
| 2026-02-14 12:00 |
18:52:31.77 |
-40:08:19.0 |
HIP 92534 |
21.28 |
| 2026-02-15 00:00 |
18:52:41.33 |
-40:08:33.9 |
HIP 92534 |
22.61 |
| 2026-02-15 12:00 |
18:52:50.83 |
-40:08:49.1 |
HIP 92804 |
23.85 |
| 2026-02-16 00:00 |
18:53:00.27 |
-40:09:04.6 |
HIP 92804 |
22.51 |
| 2026-02-16 12:00 |
18:53:09.64 |
-40:09:20.3 |
HIP 92804 |
21.26 |
| 2026-02-17 00:00 |
18:53:18.95 |
-40:09:36.3 |
HIP 92804 |
20.11 |
| 2026-02-17 12:00 |
18:53:28.19 |
-40:09:52.6 |
HIP 92804 |
19.07 |
| 2026-02-18 00:00 |
18:53:37.36 |
-40:10:09.2 |
HIP 92804 |
18.16 |
| 2026-02-18 12:00 |
18:53:46.47 |
-40:10:26.0 |
HIP 92804 |
17.40 |
| 2026-02-19 00:00 |
18:53:55.50 |
-40:10:43.1 |
HIP 92804 |
16.80 |
| 2026-02-19 12:00 |
18:54:04.47 |
-40:11:00.5 |
HIP 92804 |
16.37 |
| 2026-02-20 00:00 |
18:54:13.37 |
-40:11:18.1 |
HIP 92804 |
16.13 |
| 2026-02-20 12:00 |
18:54:22.20 |
-40:11:36.1 |
HIP 92804 |
16.08 |
| 2026-02-21 00:00 |
18:54:30.95 |
-40:11:54.2 |
HIP 92804 |
16.21 |
| 2026-02-21 12:00 |
18:54:39.64 |
-40:12:12.7 |
HIP 92804 |
16.53 |
| 2026-02-22 00:00 |
18:54:48.25 |
-40:12:31.4 |
HIP 92804 |
17.01 |
| 2026-02-22 12:00 |
18:54:56.80 |
-40:12:50.4 |
HIP 92804 |
17.64 |
| 2026-02-23 00:00 |
18:55:05.27 |
-40:13:09.7 |
HIP 92804 |
18.39 |
| 2026-02-23 12:00 |
18:55:13.67 |
-40:13:29.2 |
HIP 92942 |
19.18 |
| 2026-02-24 00:00 |
18:55:21.99 |
-40:13:49.0 |
HIP 92942 |
18.62 |