| 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 |
-0.890 |
| 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) |
| 2026-05-12 00:00 |
05:36:06.83 |
+40:07:21.1 |
HIP 26363 |
9.42 |
| 2026-05-12 12:00 |
05:36:13.49 |
+40:07:15.3 |
HIP 26363 |
8.30 |
| 2026-05-13 00:00 |
05:36:20.22 |
+40:07:09.9 |
HIP 26363 |
7.22 |
| 2026-05-13 12:00 |
05:36:27.01 |
+40:07:04.9 |
HIP 26363 |
6.20 |
| 2026-05-14 00:00 |
05:36:33.86 |
+40:07:00.3 |
HIP 26363 |
5.30 |
| 2026-05-14 12:00 |
05:36:40.77 |
+40:06:56.1 |
HIP 26363 |
4.59 |
| 2026-05-15 00:00 |
05:36:47.74 |
+40:06:52.2 |
HIP 26363 |
4.17 |
| 2026-05-15 12:00 |
05:36:54.76 |
+40:06:48.7 |
HIP 26363 |
4.16 |
| 2026-05-16 00:00 |
05:37:01.85 |
+40:06:45.5 |
HIP 26363 |
4.56 |
| 2026-05-16 12:00 |
05:37:08.99 |
+40:06:42.8 |
HIP 26363 |
5.28 |
| 2026-05-17 00:00 |
05:37:16.18 |
+40:06:40.4 |
HIP 26363 |
6.23 |
| 2026-05-17 12:00 |
05:37:23.43 |
+40:06:38.4 |
HIP 26363 |
7.32 |
| 2026-05-18 00:00 |
05:37:30.74 |
+40:06:36.8 |
HIP 26363 |
8.51 |
| 2026-05-18 12:00 |
05:37:38.09 |
+40:06:35.5 |
HIP 26363 |
9.75 |
| 2026-05-19 00:00 |
05:37:45.50 |
+40:06:34.6 |
HIP 26363 |
11.04 |
| 2026-05-19 12:00 |
05:37:52.95 |
+40:06:34.1 |
HIP 26363 |
12.37 |
| 2026-05-20 00:00 |
05:38:00.46 |
+40:06:34.0 |
HIP 26537 |
12.47 |
| 2026-05-20 12:00 |
05:38:08.01 |
+40:06:34.2 |
HIP 26537 |
11.70 |
| 2026-05-21 00:00 |
05:38:15.61 |
+40:06:34.8 |
HIP 26537 |
11.05 |
| 2026-05-21 12:00 |
05:38:23.26 |
+40:06:35.8 |
HIP 26537 |
10.58 |
| 2026-05-22 00:00 |
05:38:30.95 |
+40:06:37.2 |
HIP 26537 |
10.30 |
| 2026-05-22 12:00 |
05:38:38.69 |
+40:06:38.9 |
HIP 26537 |
10.23 |
| 2026-05-23 00:00 |
05:38:46.47 |
+40:06:41.0 |
HIP 26537 |
10.38 |
| 2026-05-23 12:00 |
05:38:54.29 |
+40:06:43.5 |
HIP 26537 |
10.75 |
| 2026-05-24 00:00 |
05:39:02.16 |
+40:06:46.3 |
HIP 26537 |
11.31 |
| 2026-05-24 12:00 |
05:39:10.06 |
+40:06:49.6 |
HIP 26537 |
12.05 |
| 2026-05-25 00:00 |
05:39:18.01 |
+40:06:53.1 |
HIP 26537 |
12.93 |
| 2026-05-25 12:00 |
05:39:25.99 |
+40:06:57.1 |
HIP 26537 |
13.93 |
| 2026-05-26 00:00 |
05:39:34.01 |
+40:07:01.4 |
HIP 26537 |
15.03 |
| 2026-05-26 12:00 |
05:39:42.08 |
+40:07:06.1 |
HIP 26537 |
16.22 |
| 2026-05-27 00:00 |
05:39:50.17 |
+40:07:11.2 |
HIP 26537 |
17.46 |
| 2026-05-27 12:00 |
05:39:58.30 |
+40:07:16.6 |
HIP 26537 |
18.77 |
| 2026-05-28 00:00 |
05:40:06.47 |
+40:07:22.5 |
HIP 26537 |
20.11 |
| 2026-05-28 12:00 |
05:40:14.67 |
+40:07:28.6 |
HIP 26537 |
21.50 |
| 2026-05-29 00:00 |
05:40:22.91 |
+40:07:35.2 |
HIP 26850 |
20.44 |
| 2026-05-29 12:00 |
05:40:31.17 |
+40:07:42.1 |
HIP 26850 |
18.95 |
| 2026-05-30 00:00 |
05:40:39.47 |
+40:07:49.4 |
HIP 26850 |
17.47 |
| 2026-05-30 12:00 |
05:40:47.80 |
+40:07:57.0 |
HIP 26850 |
16.00 |
| 2026-05-31 00:00 |
05:40:56.16 |
+40:08:05.0 |
HIP 26850 |
14.55 |
| 2026-05-31 12:00 |
05:41:04.55 |
+40:08:13.4 |
HIP 26850 |
13.12 |
| 2026-06-01 00:00 |
05:41:12.97 |
+40:08:22.2 |
HIP 26850 |
11.74 |
| 2026-06-01 12:00 |
05:41:21.41 |
+40:08:31.3 |
HIP 26850 |
10.41 |
| 2026-06-02 00:00 |
05:41:29.89 |
+40:08:40.8 |
HIP 26850 |
9.17 |