268P/Bernardi
| Parameter |
Value |
| Designation |
268P/Bernardi |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-04-26T22:31:48.293760Z |
| Orbit solution date (soln_date, UTC) |
2025-06-26T10:13:20Z |
| Obs used |
212 |
| NEO |
- |
| M1 |
17.200 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-07-05.0000000 |
| e |
0.46984750 |
| q (au) |
2.418721 |
| a (au) |
4.562311 |
| i (deg) |
16.096643 |
| Ω (om, deg) |
127.631061 |
| ω (w, deg) |
0.319263 |
| M (ma, deg) |
44.002476 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.702 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.702 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.806 |
| k |
0.998 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
15:50:22.50 |
-04:28:11.4 |
HIP 77542 |
33.49 |
| 2026-02-03 12:00 |
15:50:43.84 |
-04:27:39.9 |
HIP 77542 |
34.37 |
| 2026-02-04 00:00 |
15:51:04.99 |
-04:27:07.3 |
HIP 77542 |
35.99 |
| 2026-02-04 12:00 |
15:51:25.94 |
-04:26:33.3 |
HIP 77843 |
33.47 |
| 2026-02-05 00:00 |
15:51:46.68 |
-04:25:58.2 |
HIP 77843 |
28.39 |
| 2026-02-05 12:00 |
15:52:07.22 |
-04:25:21.9 |
HIP 77843 |
23.40 |
| 2026-02-06 00:00 |
15:52:27.55 |
-04:24:44.4 |
HIP 77843 |
18.57 |
| 2026-02-06 12:00 |
15:52:47.68 |
-04:24:05.6 |
HIP 77843 |
13.99 |
| 2026-02-07 00:00 |
15:53:07.61 |
-04:23:25.7 |
HIP 77843 |
9.94 |
| 2026-02-07 12:00 |
15:53:27.32 |
-04:22:44.5 |
HIP 77843 |
7.26 |
| 2026-02-08 00:00 |
15:53:46.83 |
-04:22:02.2 |
HIP 77843 |
7.48 |
| 2026-02-08 12:00 |
15:54:06.12 |
-04:21:18.7 |
HIP 77899 |
7.31 |
| 2026-02-09 00:00 |
15:54:25.20 |
-04:20:34.0 |
HIP 77899 |
3.88 |
| 2026-02-09 12:00 |
15:54:44.07 |
-04:19:48.1 |
HIP 77899 |
4.75 |
| 2026-02-10 00:00 |
15:55:02.72 |
-04:19:01.0 |
HIP 77899 |
8.63 |
| 2026-02-10 12:00 |
15:55:21.16 |
-04:18:12.8 |
HIP 77899 |
13.02 |
| 2026-02-11 00:00 |
15:55:39.38 |
-04:17:23.4 |
HIP 78089 |
15.75 |
| 2026-02-11 12:00 |
15:55:57.38 |
-04:16:32.8 |
HIP 78089 |
11.19 |
| 2026-02-12 00:00 |
15:56:15.17 |
-04:15:41.1 |
HIP 78089 |
6.67 |
| 2026-02-12 12:00 |
15:56:32.73 |
-04:14:48.2 |
HIP 78089 |
2.21 |
| 2026-02-13 00:00 |
15:56:50.06 |
-04:13:54.2 |
HIP 78089 |
2.21 |
| 2026-02-13 12:00 |
15:57:07.18 |
-04:12:59.0 |
HIP 78089 |
6.57 |
| 2026-02-14 00:00 |
15:57:24.06 |
-04:12:02.7 |
HIP 78089 |
10.89 |
| 2026-02-14 12:00 |
15:57:40.73 |
-04:11:05.2 |
HIP 78089 |
15.15 |
| 2026-02-15 00:00 |
15:57:57.16 |
-04:10:06.7 |
HIP 78190 |
17.47 |
| 2026-02-15 12:00 |
15:58:13.37 |
-04:09:07.0 |
HIP 78190 |
18.97 |
| 2026-02-16 00:00 |
15:58:29.34 |
-04:08:06.2 |
HIP 78190 |
21.19 |
| 2026-02-16 12:00 |
15:58:45.09 |
-04:07:04.3 |
HIP 78190 |
23.90 |
| 2026-02-17 00:00 |
15:59:00.60 |
-04:06:01.3 |
HIP 78190 |
26.94 |
| 2026-02-17 12:00 |
15:59:15.88 |
-04:04:57.2 |
HIP 78190 |
30.17 |
| 2026-02-18 00:00 |
15:59:30.92 |
-04:03:52.0 |
HIP 78190 |
33.53 |
| 2026-02-18 12:00 |
15:59:45.73 |
-04:02:45.7 |
HIP 78513 |
33.42 |
| 2026-02-19 00:00 |
16:00:00.30 |
-04:01:38.4 |
HIP 78513 |
29.74 |
| 2026-02-19 12:00 |
16:00:14.63 |
-04:00:30.0 |
HIP 78513 |
26.12 |
| 2026-02-20 00:00 |
16:00:28.73 |
-03:59:20.5 |
HIP 78513 |
22.59 |
| 2026-02-20 12:00 |
16:00:42.58 |
-03:58:10.0 |
HIP 78513 |
19.15 |
| 2026-02-21 00:00 |
16:00:56.19 |
-03:56:58.5 |
HIP 78513 |
15.84 |
| 2026-02-21 12:00 |
16:01:09.57 |
-03:55:45.9 |
HIP 78513 |
12.71 |
| 2026-02-22 00:00 |
16:01:22.69 |
-03:54:32.3 |
HIP 78513 |
9.88 |
| 2026-02-22 12:00 |
16:01:35.58 |
-03:53:17.7 |
HIP 78513 |
7.62 |
| 2026-02-23 00:00 |
16:01:48.22 |
-03:52:02.1 |
HIP 78513 |
6.46 |
| 2026-02-23 12:00 |
16:02:00.62 |
-03:50:45.5 |
HIP 78513 |
6.92 |
| 2026-02-24 00:00 |
16:02:12.77 |
-03:49:28.0 |
HIP 78513 |
8.68 |