C/1966 P2 (Barbon)
| Parameter |
Value |
| Designation |
C/1966 P2 (Barbon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1966-04-17T18:42:45.604800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:17Z |
| Obs used |
90 |
| NEO |
- |
| M1 |
5.600 |
| K1 |
11.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1966-09-13.0000000 |
| e |
0.99811001 |
| q (au) |
2.018741 |
| a (au) |
1068.123028 |
| i (deg) |
28.707616 |
| Ω (om, deg) |
167.689319 |
| ω (w, deg) |
136.165961 |
| M (ma, deg) |
0.004185 |
Magnitude
Scatter + Global Linear
$$
M_a = (4.104 + 4.736\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
4.104 |
| n |
4.736 |
| gf |
1.000 |
| gb |
-1.000 |
| 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) |
| 2026-02-03 00:00 |
07:09:30.77 |
-02:53:18.9 |
HIP 34494 |
14.89 |
| 2026-02-03 12:00 |
07:09:29.52 |
-02:53:12.4 |
HIP 34494 |
14.60 |
| 2026-02-04 00:00 |
07:09:28.28 |
-02:53:05.9 |
HIP 34494 |
14.32 |
| 2026-02-04 12:00 |
07:09:27.04 |
-02:52:59.2 |
HIP 34494 |
14.03 |
| 2026-02-05 00:00 |
07:09:25.81 |
-02:52:52.6 |
HIP 34494 |
13.75 |
| 2026-02-05 12:00 |
07:09:24.58 |
-02:52:45.8 |
HIP 34494 |
13.47 |
| 2026-02-06 00:00 |
07:09:23.36 |
-02:52:39.0 |
HIP 34494 |
13.20 |
| 2026-02-06 12:00 |
07:09:22.15 |
-02:52:32.2 |
HIP 34494 |
12.92 |
| 2026-02-07 00:00 |
07:09:20.95 |
-02:52:25.3 |
HIP 34494 |
12.65 |
| 2026-02-07 12:00 |
07:09:19.75 |
-02:52:18.3 |
HIP 34494 |
12.38 |
| 2026-02-08 00:00 |
07:09:18.56 |
-02:52:11.3 |
HIP 34494 |
12.12 |
| 2026-02-08 12:00 |
07:09:17.37 |
-02:52:04.2 |
HIP 34494 |
11.85 |
| 2026-02-09 00:00 |
07:09:16.20 |
-02:51:57.1 |
HIP 34494 |
11.59 |
| 2026-02-09 12:00 |
07:09:15.03 |
-02:51:49.9 |
HIP 34494 |
11.33 |
| 2026-02-10 00:00 |
07:09:13.86 |
-02:51:42.6 |
HIP 34494 |
11.08 |
| 2026-02-10 12:00 |
07:09:12.71 |
-02:51:35.3 |
HIP 34494 |
10.83 |
| 2026-02-11 00:00 |
07:09:11.56 |
-02:51:28.0 |
HIP 34494 |
10.58 |
| 2026-02-11 12:00 |
07:09:10.42 |
-02:51:20.5 |
HIP 34494 |
10.33 |
| 2026-02-12 00:00 |
07:09:09.29 |
-02:51:13.1 |
HIP 34494 |
10.09 |
| 2026-02-12 12:00 |
07:09:08.16 |
-02:51:05.6 |
HIP 34494 |
9.86 |
| 2026-02-13 00:00 |
07:09:07.04 |
-02:50:58.0 |
HIP 34494 |
9.62 |
| 2026-02-13 12:00 |
07:09:05.93 |
-02:50:50.4 |
HIP 34494 |
9.39 |
| 2026-02-14 00:00 |
07:09:04.83 |
-02:50:42.7 |
HIP 34494 |
9.17 |
| 2026-02-14 12:00 |
07:09:03.74 |
-02:50:35.0 |
HIP 34494 |
8.95 |
| 2026-02-15 00:00 |
07:09:02.65 |
-02:50:27.2 |
HIP 34494 |
8.74 |
| 2026-02-15 12:00 |
07:09:01.58 |
-02:50:19.4 |
HIP 34494 |
8.53 |
| 2026-02-16 00:00 |
07:09:00.51 |
-02:50:11.5 |
HIP 34494 |
8.32 |
| 2026-02-16 12:00 |
07:08:59.45 |
-02:50:03.6 |
HIP 34494 |
8.12 |
| 2026-02-17 00:00 |
07:08:58.40 |
-02:49:55.6 |
HIP 34494 |
7.93 |
| 2026-02-17 12:00 |
07:08:57.35 |
-02:49:47.6 |
HIP 34494 |
7.74 |
| 2026-02-18 00:00 |
07:08:56.32 |
-02:49:39.6 |
HIP 34494 |
7.56 |
| 2026-02-18 12:00 |
07:08:55.29 |
-02:49:31.5 |
HIP 34494 |
7.39 |
| 2026-02-19 00:00 |
07:08:54.28 |
-02:49:23.4 |
HIP 34494 |
7.22 |
| 2026-02-19 12:00 |
07:08:53.27 |
-02:49:15.2 |
HIP 34494 |
7.06 |
| 2026-02-20 00:00 |
07:08:52.27 |
-02:49:06.9 |
HIP 34494 |
6.91 |
| 2026-02-20 12:00 |
07:08:51.28 |
-02:48:58.7 |
HIP 34494 |
6.76 |
| 2026-02-21 00:00 |
07:08:50.30 |
-02:48:50.4 |
HIP 34494 |
6.63 |
| 2026-02-21 12:00 |
07:08:49.33 |
-02:48:42.0 |
HIP 34494 |
6.50 |
| 2026-02-22 00:00 |
07:08:48.37 |
-02:48:33.6 |
HIP 34494 |
6.38 |
| 2026-02-22 12:00 |
07:08:47.42 |
-02:48:25.2 |
HIP 34494 |
6.27 |
| 2026-02-23 00:00 |
07:08:46.47 |
-02:48:16.7 |
HIP 34494 |
6.17 |
| 2026-02-23 12:00 |
07:08:45.54 |
-02:48:08.2 |
HIP 34494 |
6.08 |
| 2026-02-24 00:00 |
07:08:44.62 |
-02:47:59.7 |
HIP 34494 |
6.00 |