| Parameter |
Value |
| Designation |
C/1974 V2 (Bennett) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1974-12-01T12:33:48.922560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:22Z |
| Obs used |
14 |
| NEO |
- |
| M1 |
10.000 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1974-11-19.0000000 |
| e |
0.99991026 |
| q (au) |
0.864648 |
| a (au) |
9635.426690 |
| i (deg) |
134.827008 |
| Ω (om, deg) |
51.348253 |
| ω (w, deg) |
324.967581 |
| M (ma, deg) |
359.999987 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.862 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.862 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-1.000 |
| k |
0.800 |
| 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) |
| 2026-07-29 00:00 |
17:53:28.62 |
+08:11:05.9 |
HIP 87621 |
17.19 |
| 2026-07-29 12:00 |
17:53:27.38 |
+08:10:58.5 |
HIP 87621 |
17.20 |
| 2026-07-30 00:00 |
17:53:26.15 |
+08:10:51.0 |
HIP 87621 |
17.22 |
| 2026-07-30 12:00 |
17:53:24.92 |
+08:10:43.4 |
HIP 87621 |
17.25 |
| 2026-07-31 00:00 |
17:53:23.70 |
+08:10:35.8 |
HIP 87621 |
17.27 |
| 2026-07-31 12:00 |
17:53:22.50 |
+08:10:28.1 |
HIP 87621 |
17.31 |
| 2026-08-01 00:00 |
17:53:21.30 |
+08:10:20.3 |
HIP 87621 |
17.34 |
| 2026-08-01 12:00 |
17:53:20.11 |
+08:10:12.4 |
HIP 87621 |
17.38 |
| 2026-08-02 00:00 |
17:53:18.92 |
+08:10:04.4 |
HIP 87621 |
17.43 |
| 2026-08-02 12:00 |
17:53:17.75 |
+08:09:56.4 |
HIP 87621 |
17.47 |
| 2026-08-03 00:00 |
17:53:16.58 |
+08:09:48.3 |
HIP 87621 |
17.52 |
| 2026-08-03 12:00 |
17:53:15.43 |
+08:09:40.1 |
HIP 87621 |
17.58 |
| 2026-08-04 00:00 |
17:53:14.28 |
+08:09:31.9 |
HIP 87621 |
17.63 |
| 2026-08-04 12:00 |
17:53:13.14 |
+08:09:23.5 |
HIP 87621 |
17.69 |
| 2026-08-05 00:00 |
17:53:12.01 |
+08:09:15.1 |
HIP 87621 |
17.76 |
| 2026-08-05 12:00 |
17:53:10.89 |
+08:09:06.6 |
HIP 87621 |
17.82 |
| 2026-08-06 00:00 |
17:53:09.78 |
+08:08:58.1 |
HIP 87621 |
17.89 |
| 2026-08-06 12:00 |
17:53:08.68 |
+08:08:49.5 |
HIP 87621 |
17.96 |
| 2026-08-07 00:00 |
17:53:07.59 |
+08:08:40.8 |
HIP 87621 |
18.03 |
| 2026-08-07 12:00 |
17:53:06.51 |
+08:08:32.0 |
HIP 87621 |
18.11 |
| 2026-08-08 00:00 |
17:53:05.43 |
+08:08:23.1 |
HIP 87621 |
18.19 |
| 2026-08-08 12:00 |
17:53:04.37 |
+08:08:14.2 |
HIP 87621 |
18.27 |
| 2026-08-09 00:00 |
17:53:03.32 |
+08:08:05.2 |
HIP 87621 |
18.35 |
| 2026-08-09 12:00 |
17:53:02.27 |
+08:07:56.2 |
HIP 87621 |
18.44 |
| 2026-08-10 00:00 |
17:53:01.24 |
+08:07:47.1 |
HIP 87621 |
18.52 |
| 2026-08-10 12:00 |
17:53:00.22 |
+08:07:37.9 |
HIP 87621 |
18.61 |
| 2026-08-11 00:00 |
17:52:59.20 |
+08:07:28.6 |
HIP 87621 |
18.70 |
| 2026-08-11 12:00 |
17:52:58.20 |
+08:07:19.3 |
HIP 87621 |
18.79 |
| 2026-08-12 00:00 |
17:52:57.21 |
+08:07:09.9 |
HIP 87621 |
18.88 |
| 2026-08-12 12:00 |
17:52:56.22 |
+08:07:00.5 |
HIP 87621 |
18.98 |
| 2026-08-13 00:00 |
17:52:55.25 |
+08:06:51.0 |
HIP 87621 |
19.07 |
| 2026-08-13 12:00 |
17:52:54.29 |
+08:06:41.4 |
HIP 87621 |
19.17 |
| 2026-08-14 00:00 |
17:52:53.34 |
+08:06:31.7 |
HIP 87621 |
19.27 |
| 2026-08-14 12:00 |
17:52:52.40 |
+08:06:22.0 |
HIP 87621 |
19.37 |
| 2026-08-15 00:00 |
17:52:51.47 |
+08:06:12.3 |
HIP 87621 |
19.47 |
| 2026-08-15 12:00 |
17:52:50.55 |
+08:06:02.4 |
HIP 87621 |
19.57 |
| 2026-08-16 00:00 |
17:52:49.64 |
+08:05:52.5 |
HIP 87621 |
19.67 |
| 2026-08-16 12:00 |
17:52:48.74 |
+08:05:42.6 |
HIP 87621 |
19.77 |
| 2026-08-17 00:00 |
17:52:47.86 |
+08:05:32.6 |
HIP 87621 |
19.87 |
| 2026-08-17 12:00 |
17:52:46.98 |
+08:05:22.5 |
HIP 87621 |
19.97 |
| 2026-08-18 00:00 |
17:52:46.12 |
+08:05:12.4 |
HIP 87621 |
20.08 |
| 2026-08-18 12:00 |
17:52:45.27 |
+08:05:02.2 |
HIP 87621 |
20.18 |
| 2026-08-19 00:00 |
17:52:44.42 |
+08:04:52.0 |
HIP 87621 |
20.28 |