| Parameter |
Value |
| Designation |
C/1988 F1 (Levy) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1987-11-29T22:34:57.907200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:36Z |
| Obs used |
37 |
| NEO |
- |
| M1 |
4.800 |
| K1 |
19.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1988-05-22.0000000 |
| e |
0.99771483 |
| q (au) |
1.174205 |
| a (au) |
513.837337 |
| i (deg) |
62.807742 |
| Ω (om, deg) |
288.763862 |
| ω (w, deg) |
326.514381 |
| M (ma, deg) |
0.014729 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.001 + 2.109\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.001 |
| n |
2.109 |
| gf |
1.000 |
| 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) |
| 2026-09-20 00:00 |
05:06:27.28 |
+65:04:39.6 |
HIP 24017 |
22.89 |
| 2026-09-20 12:00 |
05:06:26.56 |
+65:04:57.5 |
HIP 24017 |
23.08 |
| 2026-09-21 00:00 |
05:06:25.79 |
+65:05:15.4 |
HIP 24017 |
23.28 |
| 2026-09-21 12:00 |
05:06:24.99 |
+65:05:33.3 |
HIP 24017 |
23.48 |
| 2026-09-22 00:00 |
05:06:24.15 |
+65:05:51.1 |
HIP 24017 |
23.69 |
| 2026-09-22 12:00 |
05:06:23.27 |
+65:06:08.8 |
HIP 24017 |
23.91 |
| 2026-09-23 00:00 |
05:06:22.36 |
+65:06:26.5 |
HIP 24017 |
24.13 |
| 2026-09-23 12:00 |
05:06:21.40 |
+65:06:44.2 |
HIP 24017 |
24.36 |
| 2026-09-24 00:00 |
05:06:20.41 |
+65:07:01.8 |
HIP 24017 |
24.59 |
| 2026-09-24 12:00 |
05:06:19.38 |
+65:07:19.3 |
HIP 24017 |
24.82 |
| 2026-09-25 00:00 |
05:06:18.32 |
+65:07:36.8 |
HIP 24017 |
25.06 |
| 2026-09-25 12:00 |
05:06:17.21 |
+65:07:54.3 |
HIP 24017 |
25.31 |
| 2026-09-26 00:00 |
05:06:16.07 |
+65:08:11.7 |
HIP 24017 |
25.55 |
| 2026-09-26 12:00 |
05:06:14.89 |
+65:08:29.0 |
HIP 24017 |
25.81 |
| 2026-09-27 00:00 |
05:06:13.67 |
+65:08:46.3 |
HIP 24017 |
26.06 |
| 2026-09-27 12:00 |
05:06:12.42 |
+65:09:03.5 |
HIP 24017 |
26.33 |
| 2026-09-28 00:00 |
05:06:11.12 |
+65:09:20.7 |
HIP 24017 |
26.59 |
| 2026-09-28 12:00 |
05:06:09.79 |
+65:09:37.8 |
HIP 24017 |
26.86 |
| 2026-09-29 00:00 |
05:06:08.42 |
+65:09:54.8 |
HIP 24017 |
27.13 |
| 2026-09-29 12:00 |
05:06:07.02 |
+65:10:11.8 |
HIP 24017 |
27.41 |
| 2026-09-30 00:00 |
05:06:05.58 |
+65:10:28.7 |
HIP 24017 |
27.69 |
| 2026-09-30 12:00 |
05:06:04.10 |
+65:10:45.5 |
HIP 24017 |
27.97 |
| 2026-10-01 00:00 |
05:06:02.58 |
+65:11:02.3 |
HIP 24017 |
28.26 |
| 2026-10-01 12:00 |
05:06:01.03 |
+65:11:19.0 |
HIP 24017 |
28.55 |
| 2026-10-02 00:00 |
05:05:59.43 |
+65:11:35.7 |
HIP 24017 |
28.85 |
| 2026-10-02 12:00 |
05:05:57.81 |
+65:11:52.2 |
HIP 24017 |
29.14 |
| 2026-10-03 00:00 |
05:05:56.14 |
+65:12:08.7 |
HIP 24017 |
29.44 |
| 2026-10-03 12:00 |
05:05:54.44 |
+65:12:25.1 |
HIP 24017 |
29.75 |
| 2026-10-04 00:00 |
05:05:52.70 |
+65:12:41.5 |
HIP 24017 |
30.05 |
| 2026-10-04 12:00 |
05:05:50.92 |
+65:12:57.7 |
HIP 23455 |
29.75 |
| 2026-10-05 00:00 |
05:05:49.11 |
+65:13:13.9 |
HIP 23455 |
29.43 |
| 2026-10-05 12:00 |
05:05:47.26 |
+65:13:30.0 |
HIP 23455 |
29.10 |
| 2026-10-06 00:00 |
05:05:45.38 |
+65:13:46.0 |
HIP 23455 |
28.77 |
| 2026-10-06 12:00 |
05:05:43.45 |
+65:14:01.9 |
HIP 23455 |
28.44 |
| 2026-10-07 00:00 |
05:05:41.50 |
+65:14:17.8 |
HIP 23455 |
28.11 |
| 2026-10-07 12:00 |
05:05:39.50 |
+65:14:33.5 |
HIP 23455 |
27.78 |
| 2026-10-08 00:00 |
05:05:37.47 |
+65:14:49.2 |
HIP 23455 |
27.44 |
| 2026-10-08 12:00 |
05:05:35.40 |
+65:15:04.8 |
HIP 23455 |
27.11 |
| 2026-10-09 00:00 |
05:05:33.30 |
+65:15:20.3 |
HIP 23455 |
26.77 |
| 2026-10-09 12:00 |
05:05:31.16 |
+65:15:35.7 |
HIP 23455 |
26.43 |
| 2026-10-10 00:00 |
05:05:28.99 |
+65:15:51.0 |
HIP 23455 |
26.09 |
| 2026-10-10 12:00 |
05:05:26.78 |
+65:16:06.2 |
HIP 23455 |
25.74 |
| 2026-10-11 00:00 |
05:05:24.53 |
+65:16:21.3 |
HIP 23455 |
25.40 |