| Parameter |
Value |
| Designation |
C/1988 C1 (Maury-Phinney) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1987-12-26T18:57:18.650880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:36Z |
| Obs used |
17 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1988-03-16.0000000 |
| e |
1.00000053 |
| q (au) |
1.930675 |
| a (au) |
-3647207.470365 |
| i (deg) |
93.158683 |
| Ω (om, deg) |
147.519927 |
| ω (w, deg) |
346.839485 |
| M (ma, deg) |
0.000000 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.701 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.701 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.571 |
| 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 |
21:22:22.32 |
+19:28:41.5 |
HIP 105502 |
19.98 |
| 2026-03-26 12:00 |
21:22:23.66 |
+19:28:57.3 |
HIP 105502 |
19.79 |
| 2026-03-27 00:00 |
21:22:24.99 |
+19:29:13.2 |
HIP 105502 |
19.61 |
| 2026-03-27 12:00 |
21:22:26.31 |
+19:29:29.1 |
HIP 105502 |
19.43 |
| 2026-03-28 00:00 |
21:22:27.61 |
+19:29:45.1 |
HIP 105502 |
19.25 |
| 2026-03-28 12:00 |
21:22:28.90 |
+19:30:01.2 |
HIP 105502 |
19.08 |
| 2026-03-29 00:00 |
21:22:30.18 |
+19:30:17.2 |
HIP 105502 |
18.92 |
| 2026-03-29 12:00 |
21:22:31.44 |
+19:30:33.3 |
HIP 105502 |
18.76 |
| 2026-03-30 00:00 |
21:22:32.70 |
+19:30:49.5 |
HIP 105502 |
18.60 |
| 2026-03-30 12:00 |
21:22:33.94 |
+19:31:05.7 |
HIP 105502 |
18.46 |
| 2026-03-31 00:00 |
21:22:35.17 |
+19:31:21.9 |
HIP 105502 |
18.32 |
| 2026-03-31 12:00 |
21:22:36.38 |
+19:31:38.2 |
HIP 105502 |
18.18 |
| 2026-04-01 00:00 |
21:22:37.59 |
+19:31:54.5 |
HIP 105502 |
18.05 |
| 2026-04-01 12:00 |
21:22:38.78 |
+19:32:10.9 |
HIP 105502 |
17.92 |
| 2026-04-02 00:00 |
21:22:39.95 |
+19:32:27.3 |
HIP 105502 |
17.81 |
| 2026-04-02 12:00 |
21:22:41.12 |
+19:32:43.7 |
HIP 105502 |
17.69 |
| 2026-04-03 00:00 |
21:22:42.27 |
+19:33:00.2 |
HIP 105502 |
17.59 |
| 2026-04-03 12:00 |
21:22:43.41 |
+19:33:16.6 |
HIP 105502 |
17.48 |
| 2026-04-04 00:00 |
21:22:44.53 |
+19:33:33.2 |
HIP 105502 |
17.39 |
| 2026-04-04 12:00 |
21:22:45.65 |
+19:33:49.7 |
HIP 105502 |
17.30 |
| 2026-04-05 00:00 |
21:22:46.74 |
+19:34:06.3 |
HIP 105502 |
17.21 |
| 2026-04-05 12:00 |
21:22:47.83 |
+19:34:22.9 |
HIP 105502 |
17.14 |
| 2026-04-06 00:00 |
21:22:48.90 |
+19:34:39.5 |
HIP 105502 |
17.06 |
| 2026-04-06 12:00 |
21:22:49.96 |
+19:34:56.2 |
HIP 105502 |
17.00 |
| 2026-04-07 00:00 |
21:22:51.00 |
+19:35:12.8 |
HIP 105502 |
16.93 |
| 2026-04-07 12:00 |
21:22:52.03 |
+19:35:29.6 |
HIP 105502 |
16.88 |
| 2026-04-08 00:00 |
21:22:53.05 |
+19:35:46.3 |
HIP 105502 |
16.83 |
| 2026-04-08 12:00 |
21:22:54.05 |
+19:36:03.0 |
HIP 105502 |
16.78 |
| 2026-04-09 00:00 |
21:22:55.04 |
+19:36:19.8 |
HIP 105502 |
16.74 |
| 2026-04-09 12:00 |
21:22:56.01 |
+19:36:36.6 |
HIP 105502 |
16.71 |
| 2026-04-10 00:00 |
21:22:56.98 |
+19:36:53.4 |
HIP 105502 |
16.68 |
| 2026-04-10 12:00 |
21:22:57.92 |
+19:37:10.2 |
HIP 105502 |
16.65 |
| 2026-04-11 00:00 |
21:22:58.85 |
+19:37:27.0 |
HIP 105502 |
16.64 |
| 2026-04-11 12:00 |
21:22:59.77 |
+19:37:43.8 |
HIP 105502 |
16.62 |
| 2026-04-12 00:00 |
21:23:00.67 |
+19:38:00.7 |
HIP 105502 |
16.61 |
| 2026-04-12 12:00 |
21:23:01.56 |
+19:38:17.5 |
HIP 105502 |
16.61 |
| 2026-04-13 00:00 |
21:23:02.44 |
+19:38:34.4 |
HIP 105502 |
16.60 |
| 2026-04-13 12:00 |
21:23:03.30 |
+19:38:51.3 |
HIP 105502 |
16.61 |
| 2026-04-14 00:00 |
21:23:04.14 |
+19:39:08.2 |
HIP 105502 |
16.62 |
| 2026-04-14 12:00 |
21:23:04.97 |
+19:39:25.0 |
HIP 105502 |
16.63 |
| 2026-04-15 00:00 |
21:23:05.79 |
+19:39:41.9 |
HIP 105502 |
16.64 |
| 2026-04-15 12:00 |
21:23:06.59 |
+19:39:58.8 |
HIP 105502 |
16.66 |
| 2026-04-16 00:00 |
21:23:07.37 |
+19:40:15.7 |
HIP 105502 |
16.69 |