| Parameter |
Value |
| Designation |
C/2024 E2 (Bok) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2023-10-23T18:35:47.109120Z |
| Orbit solution date (soln_date, UTC) |
2024-05-14T12:42:25Z |
| Obs used |
81 |
| NEO |
- |
| M1 |
8.600 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2024-03-10T06:03:37.900800Z |
| Discovery magnitude (MPC) |
22.75 G |
| Discovery observatory (MPC) |
V00 · Kitt Peak-Bok |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2024-03-17.0000000 |
| e |
0.85195999 |
| q (au) |
7.692115 |
| a (au) |
51.959703 |
| i (deg) |
155.652171 |
| Ω (om, deg) |
135.652797 |
| ω (w, deg) |
358.035418 |
| M (ma, deg) |
0.382161 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.032 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.032 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.501 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
05:58:35.28 |
+43:07:36.0 |
HIP 28246 |
17.39 |
| 2026-09-20 12:00 |
05:58:29.27 |
+43:08:57.7 |
HIP 28246 |
18.44 |
| 2026-09-21 00:00 |
05:58:23.11 |
+43:10:19.6 |
HIP 28246 |
19.58 |
| 2026-09-21 12:00 |
05:58:16.80 |
+43:11:41.6 |
HIP 28283 |
18.81 |
| 2026-09-22 00:00 |
05:58:10.33 |
+43:13:03.7 |
HIP 28283 |
17.71 |
| 2026-09-22 12:00 |
05:58:03.70 |
+43:14:25.9 |
HIP 28283 |
16.74 |
| 2026-09-23 00:00 |
05:57:56.91 |
+43:15:48.1 |
HIP 28283 |
15.92 |
| 2026-09-23 12:00 |
05:57:49.97 |
+43:17:10.5 |
HIP 28283 |
15.31 |
| 2026-09-24 00:00 |
05:57:42.87 |
+43:18:32.9 |
HIP 28283 |
14.91 |
| 2026-09-24 12:00 |
05:57:35.61 |
+43:19:55.4 |
HIP 28283 |
14.77 |
| 2026-09-25 00:00 |
05:57:28.19 |
+43:21:18.0 |
HIP 28283 |
14.89 |
| 2026-09-25 12:00 |
05:57:20.61 |
+43:22:40.6 |
HIP 28283 |
15.28 |
| 2026-09-26 00:00 |
05:57:12.87 |
+43:24:03.3 |
HIP 28283 |
15.93 |
| 2026-09-26 12:00 |
05:57:04.97 |
+43:25:26.0 |
HIP 28283 |
16.81 |
| 2026-09-27 00:00 |
05:56:56.91 |
+43:26:48.7 |
HIP 28012 |
17.81 |
| 2026-09-27 12:00 |
05:56:48.69 |
+43:28:11.5 |
HIP 28012 |
15.84 |
| 2026-09-28 00:00 |
05:56:40.30 |
+43:29:34.3 |
HIP 28012 |
13.87 |
| 2026-09-28 12:00 |
05:56:31.76 |
+43:30:57.2 |
HIP 28012 |
11.89 |
| 2026-09-29 00:00 |
05:56:23.05 |
+43:32:20.0 |
HIP 28012 |
9.92 |
| 2026-09-29 12:00 |
05:56:14.18 |
+43:33:42.8 |
HIP 28012 |
7.99 |
| 2026-09-30 00:00 |
05:56:05.14 |
+43:35:05.7 |
HIP 28012 |
6.16 |
| 2026-09-30 12:00 |
05:55:55.94 |
+43:36:28.5 |
HIP 28012 |
4.58 |
| 2026-10-01 00:00 |
05:55:46.58 |
+43:37:51.4 |
HIP 28012 |
3.62 |
| 2026-10-01 12:00 |
05:55:37.05 |
+43:39:14.2 |
HIP 28012 |
3.85 |
| 2026-10-02 00:00 |
05:55:27.35 |
+43:40:36.9 |
HIP 28012 |
5.13 |
| 2026-10-02 12:00 |
05:55:17.49 |
+43:41:59.7 |
HIP 28012 |
6.92 |
| 2026-10-03 00:00 |
05:55:07.47 |
+43:43:22.3 |
HIP 28012 |
8.94 |
| 2026-10-03 12:00 |
05:54:57.27 |
+43:44:45.0 |
HIP 28012 |
11.08 |
| 2026-10-04 00:00 |
05:54:46.91 |
+43:46:07.6 |
HIP 28012 |
13.28 |
| 2026-10-04 12:00 |
05:54:36.38 |
+43:47:30.1 |
HIP 28012 |
15.54 |
| 2026-10-05 00:00 |
05:54:25.69 |
+43:48:52.5 |
HIP 28012 |
17.84 |
| 2026-10-05 12:00 |
05:54:14.82 |
+43:50:14.8 |
HIP 28012 |
20.18 |
| 2026-10-06 00:00 |
05:54:03.79 |
+43:51:37.1 |
HIP 28012 |
22.54 |
| 2026-10-06 12:00 |
05:53:52.59 |
+43:52:59.3 |
HIP 27848 |
23.74 |
| 2026-10-07 00:00 |
05:53:41.22 |
+43:54:21.3 |
HIP 27848 |
22.13 |
| 2026-10-07 12:00 |
05:53:29.68 |
+43:55:43.2 |
HIP 27848 |
20.69 |
| 2026-10-08 00:00 |
05:53:17.97 |
+43:57:05.0 |
HIP 27848 |
19.46 |
| 2026-10-08 12:00 |
05:53:06.09 |
+43:58:26.7 |
HIP 27848 |
18.50 |
| 2026-10-09 00:00 |
05:52:54.04 |
+43:59:48.2 |
HIP 27848 |
17.87 |
| 2026-10-09 12:00 |
05:52:41.82 |
+44:01:09.6 |
HIP 27848 |
17.60 |
| 2026-10-10 00:00 |
05:52:29.43 |
+44:02:30.8 |
HIP 27848 |
17.73 |
| 2026-10-10 12:00 |
05:52:16.88 |
+44:03:51.8 |
HIP 27598 |
18.17 |
| 2026-10-11 00:00 |
05:52:04.15 |
+44:05:12.7 |
HIP 27598 |
16.24 |