C/1974 V2 (Bennett)
| 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) |
| 2026-02-03 00:00 |
17:57:31.99 |
+07:36:43.3 |
HIP 87989 |
14.54 |
| 2026-02-03 12:00 |
17:57:33.09 |
+07:36:51.4 |
HIP 87989 |
14.36 |
| 2026-02-04 00:00 |
17:57:34.18 |
+07:36:59.6 |
HIP 87989 |
14.18 |
| 2026-02-04 12:00 |
17:57:35.27 |
+07:37:07.9 |
HIP 87989 |
14.02 |
| 2026-02-05 00:00 |
17:57:36.34 |
+07:37:16.2 |
HIP 87989 |
13.86 |
| 2026-02-05 12:00 |
17:57:37.40 |
+07:37:24.6 |
HIP 87989 |
13.70 |
| 2026-02-06 00:00 |
17:57:38.46 |
+07:37:33.1 |
HIP 87989 |
13.56 |
| 2026-02-06 12:00 |
17:57:39.50 |
+07:37:41.7 |
HIP 87989 |
13.42 |
| 2026-02-07 00:00 |
17:57:40.53 |
+07:37:50.3 |
HIP 87989 |
13.29 |
| 2026-02-07 12:00 |
17:57:41.56 |
+07:37:59.0 |
HIP 87989 |
13.17 |
| 2026-02-08 00:00 |
17:57:42.57 |
+07:38:07.8 |
HIP 87989 |
13.05 |
| 2026-02-08 12:00 |
17:57:43.57 |
+07:38:16.6 |
HIP 87989 |
12.95 |
| 2026-02-09 00:00 |
17:57:44.57 |
+07:38:25.5 |
HIP 87989 |
12.85 |
| 2026-02-09 12:00 |
17:57:45.55 |
+07:38:34.5 |
HIP 87989 |
12.76 |
| 2026-02-10 00:00 |
17:57:46.52 |
+07:38:43.5 |
HIP 87989 |
12.68 |
| 2026-02-10 12:00 |
17:57:47.48 |
+07:38:52.7 |
HIP 87989 |
12.61 |
| 2026-02-11 00:00 |
17:57:48.43 |
+07:39:01.8 |
HIP 87989 |
12.55 |
| 2026-02-11 12:00 |
17:57:49.38 |
+07:39:11.1 |
HIP 87989 |
12.49 |
| 2026-02-12 00:00 |
17:57:50.31 |
+07:39:20.4 |
HIP 87989 |
12.45 |
| 2026-02-12 12:00 |
17:57:51.22 |
+07:39:29.8 |
HIP 87989 |
12.41 |
| 2026-02-13 00:00 |
17:57:52.13 |
+07:39:39.2 |
HIP 87989 |
12.38 |
| 2026-02-13 12:00 |
17:57:53.03 |
+07:39:48.7 |
HIP 87989 |
12.36 |
| 2026-02-14 00:00 |
17:57:53.91 |
+07:39:58.3 |
HIP 87989 |
12.35 |
| 2026-02-14 12:00 |
17:57:54.79 |
+07:40:07.9 |
HIP 87989 |
12.35 |
| 2026-02-15 00:00 |
17:57:55.65 |
+07:40:17.6 |
HIP 87989 |
12.35 |
| 2026-02-15 12:00 |
17:57:56.50 |
+07:40:27.4 |
HIP 87989 |
12.37 |
| 2026-02-16 00:00 |
17:57:57.35 |
+07:40:37.2 |
HIP 87989 |
12.39 |
| 2026-02-16 12:00 |
17:57:58.18 |
+07:40:47.1 |
HIP 87989 |
12.42 |
| 2026-02-17 00:00 |
17:57:58.99 |
+07:40:57.0 |
HIP 87989 |
12.46 |
| 2026-02-17 12:00 |
17:57:59.80 |
+07:41:07.0 |
HIP 87989 |
12.50 |
| 2026-02-18 00:00 |
17:58:00.59 |
+07:41:17.0 |
HIP 87989 |
12.55 |
| 2026-02-18 12:00 |
17:58:01.38 |
+07:41:27.1 |
HIP 87989 |
12.61 |
| 2026-02-19 00:00 |
17:58:02.15 |
+07:41:37.3 |
HIP 87989 |
12.68 |
| 2026-02-19 12:00 |
17:58:02.91 |
+07:41:47.5 |
HIP 87989 |
12.75 |
| 2026-02-20 00:00 |
17:58:03.65 |
+07:41:57.7 |
HIP 87989 |
12.83 |
| 2026-02-20 12:00 |
17:58:04.39 |
+07:42:08.0 |
HIP 87989 |
12.92 |
| 2026-02-21 00:00 |
17:58:05.11 |
+07:42:18.4 |
HIP 87989 |
13.01 |
| 2026-02-21 12:00 |
17:58:05.82 |
+07:42:28.8 |
HIP 87989 |
13.11 |
| 2026-02-22 00:00 |
17:58:06.52 |
+07:42:39.3 |
HIP 87989 |
13.21 |
| 2026-02-22 12:00 |
17:58:07.21 |
+07:42:49.8 |
HIP 87989 |
13.32 |
| 2026-02-23 00:00 |
17:58:07.89 |
+07:43:00.3 |
HIP 87989 |
13.44 |
| 2026-02-23 12:00 |
17:58:08.55 |
+07:43:10.9 |
HIP 87989 |
13.56 |
| 2026-02-24 00:00 |
17:58:09.20 |
+07:43:21.6 |
HIP 87989 |
13.68 |