| 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) |
| 2026-03-26 00:00 |
17:58:24.50 |
+07:54:52.6 |
HIP 88084 |
24.32 |
| 2026-03-26 12:00 |
17:58:24.35 |
+07:55:04.4 |
HIP 88084 |
24.19 |
| 2026-03-27 00:00 |
17:58:24.18 |
+07:55:16.2 |
HIP 88084 |
24.06 |
| 2026-03-27 12:00 |
17:58:24.00 |
+07:55:28.0 |
HIP 88084 |
23.94 |
| 2026-03-28 00:00 |
17:58:23.81 |
+07:55:39.8 |
HIP 88084 |
23.82 |
| 2026-03-28 12:00 |
17:58:23.60 |
+07:55:51.6 |
HIP 88084 |
23.71 |
| 2026-03-29 00:00 |
17:58:23.38 |
+07:56:03.4 |
HIP 88084 |
23.59 |
| 2026-03-29 12:00 |
17:58:23.14 |
+07:56:15.1 |
HIP 88084 |
23.49 |
| 2026-03-30 00:00 |
17:58:22.90 |
+07:56:26.9 |
HIP 88084 |
23.38 |
| 2026-03-30 12:00 |
17:58:22.64 |
+07:56:38.6 |
HIP 88084 |
23.28 |
| 2026-03-31 00:00 |
17:58:22.36 |
+07:56:50.3 |
HIP 88084 |
23.18 |
| 2026-03-31 12:00 |
17:58:22.08 |
+07:57:02.0 |
HIP 88084 |
23.09 |
| 2026-04-01 00:00 |
17:58:21.78 |
+07:57:13.7 |
HIP 88084 |
23.00 |
| 2026-04-01 12:00 |
17:58:21.46 |
+07:57:25.4 |
HIP 88084 |
22.91 |
| 2026-04-02 00:00 |
17:58:21.14 |
+07:57:37.0 |
HIP 88084 |
22.83 |
| 2026-04-02 12:00 |
17:58:20.80 |
+07:57:48.7 |
HIP 88084 |
22.76 |
| 2026-04-03 00:00 |
17:58:20.45 |
+07:58:00.3 |
HIP 88084 |
22.68 |
| 2026-04-03 12:00 |
17:58:20.08 |
+07:58:11.9 |
HIP 88084 |
22.61 |
| 2026-04-04 00:00 |
17:58:19.70 |
+07:58:23.4 |
HIP 88084 |
22.55 |
| 2026-04-04 12:00 |
17:58:19.31 |
+07:58:35.0 |
HIP 88084 |
22.49 |
| 2026-04-05 00:00 |
17:58:18.90 |
+07:58:46.5 |
HIP 88084 |
22.44 |
| 2026-04-05 12:00 |
17:58:18.49 |
+07:58:58.0 |
HIP 88084 |
22.39 |
| 2026-04-06 00:00 |
17:58:18.06 |
+07:59:09.4 |
HIP 88084 |
22.34 |
| 2026-04-06 12:00 |
17:58:17.61 |
+07:59:20.9 |
HIP 88084 |
22.30 |
| 2026-04-07 00:00 |
17:58:17.16 |
+07:59:32.3 |
HIP 88084 |
22.26 |
| 2026-04-07 12:00 |
17:58:16.69 |
+07:59:43.7 |
HIP 88084 |
22.23 |
| 2026-04-08 00:00 |
17:58:16.21 |
+07:59:55.0 |
HIP 88084 |
22.21 |
| 2026-04-08 12:00 |
17:58:15.71 |
+08:00:06.3 |
HIP 88084 |
22.18 |
| 2026-04-09 00:00 |
17:58:15.20 |
+08:00:17.6 |
HIP 88084 |
22.17 |
| 2026-04-09 12:00 |
17:58:14.68 |
+08:00:28.9 |
HIP 88084 |
22.16 |
| 2026-04-10 00:00 |
17:58:14.15 |
+08:00:40.1 |
HIP 88084 |
22.15 |
| 2026-04-10 12:00 |
17:58:13.60 |
+08:00:51.3 |
HIP 88084 |
22.15 |
| 2026-04-11 00:00 |
17:58:13.04 |
+08:01:02.5 |
HIP 88084 |
22.16 |
| 2026-04-11 12:00 |
17:58:12.47 |
+08:01:13.6 |
HIP 88084 |
22.17 |
| 2026-04-12 00:00 |
17:58:11.89 |
+08:01:24.7 |
HIP 88084 |
22.18 |
| 2026-04-12 12:00 |
17:58:11.29 |
+08:01:35.8 |
HIP 88084 |
22.20 |
| 2026-04-13 00:00 |
17:58:10.68 |
+08:01:46.8 |
HIP 88084 |
22.23 |
| 2026-04-13 12:00 |
17:58:10.06 |
+08:01:57.8 |
HIP 88084 |
22.26 |
| 2026-04-14 00:00 |
17:58:09.43 |
+08:02:08.7 |
HIP 88084 |
22.30 |
| 2026-04-14 12:00 |
17:58:08.78 |
+08:02:19.6 |
HIP 88084 |
22.34 |
| 2026-04-15 00:00 |
17:58:08.12 |
+08:02:30.5 |
HIP 88084 |
22.39 |
| 2026-04-15 12:00 |
17:58:07.45 |
+08:02:41.3 |
HIP 88084 |
22.44 |
| 2026-04-16 00:00 |
17:58:06.77 |
+08:02:52.1 |
HIP 88084 |
22.50 |