| 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) |
| 2026-06-01 00:00 |
21:23:12.08 |
+20:03:27.9 |
HIP 105517 |
13.39 |
| 2026-06-01 12:00 |
21:23:11.40 |
+20:03:39.6 |
HIP 105517 |
13.27 |
| 2026-06-02 00:00 |
21:23:10.70 |
+20:03:51.2 |
HIP 105517 |
13.15 |
| 2026-06-02 12:00 |
21:23:09.98 |
+20:04:02.7 |
HIP 105517 |
13.03 |
| 2026-06-03 00:00 |
21:23:09.25 |
+20:04:14.0 |
HIP 105517 |
12.91 |
| 2026-06-03 12:00 |
21:23:08.50 |
+20:04:25.3 |
HIP 105517 |
12.79 |
| 2026-06-04 00:00 |
21:23:07.74 |
+20:04:36.5 |
HIP 105517 |
12.67 |
| 2026-06-04 12:00 |
21:23:06.97 |
+20:04:47.5 |
HIP 105517 |
12.55 |
| 2026-06-05 00:00 |
21:23:06.18 |
+20:04:58.5 |
HIP 105517 |
12.43 |
| 2026-06-05 12:00 |
21:23:05.37 |
+20:05:09.3 |
HIP 105517 |
12.31 |
| 2026-06-06 00:00 |
21:23:04.55 |
+20:05:20.0 |
HIP 105517 |
12.19 |
| 2026-06-06 12:00 |
21:23:03.72 |
+20:05:30.6 |
HIP 105517 |
12.08 |
| 2026-06-07 00:00 |
21:23:02.87 |
+20:05:41.1 |
HIP 105517 |
11.96 |
| 2026-06-07 12:00 |
21:23:02.00 |
+20:05:51.5 |
HIP 105517 |
11.85 |
| 2026-06-08 00:00 |
21:23:01.13 |
+20:06:01.8 |
HIP 105517 |
11.73 |
| 2026-06-08 12:00 |
21:23:00.23 |
+20:06:11.9 |
HIP 105517 |
11.62 |
| 2026-06-09 00:00 |
21:22:59.33 |
+20:06:21.9 |
HIP 105517 |
11.50 |
| 2026-06-09 12:00 |
21:22:58.41 |
+20:06:31.8 |
HIP 105517 |
11.39 |
| 2026-06-10 00:00 |
21:22:57.47 |
+20:06:41.6 |
HIP 105517 |
11.29 |
| 2026-06-10 12:00 |
21:22:56.52 |
+20:06:51.3 |
HIP 105517 |
11.18 |
| 2026-06-11 00:00 |
21:22:55.56 |
+20:07:00.8 |
HIP 105517 |
11.07 |
| 2026-06-11 12:00 |
21:22:54.58 |
+20:07:10.2 |
HIP 105517 |
10.97 |
| 2026-06-12 00:00 |
21:22:53.59 |
+20:07:19.5 |
HIP 105517 |
10.87 |
| 2026-06-12 12:00 |
21:22:52.58 |
+20:07:28.7 |
HIP 105517 |
10.77 |
| 2026-06-13 00:00 |
21:22:51.56 |
+20:07:37.8 |
HIP 105517 |
10.67 |
| 2026-06-13 12:00 |
21:22:50.53 |
+20:07:46.7 |
HIP 105517 |
10.58 |
| 2026-06-14 00:00 |
21:22:49.48 |
+20:07:55.5 |
HIP 105517 |
10.49 |
| 2026-06-14 12:00 |
21:22:48.42 |
+20:08:04.1 |
HIP 105517 |
10.40 |
| 2026-06-15 00:00 |
21:22:47.35 |
+20:08:12.7 |
HIP 105517 |
10.32 |
| 2026-06-15 12:00 |
21:22:46.26 |
+20:08:21.1 |
HIP 105517 |
10.24 |
| 2026-06-16 00:00 |
21:22:45.16 |
+20:08:29.4 |
HIP 105517 |
10.17 |
| 2026-06-16 12:00 |
21:22:44.04 |
+20:08:37.5 |
HIP 105517 |
10.09 |
| 2026-06-17 00:00 |
21:22:42.91 |
+20:08:45.5 |
HIP 105517 |
10.03 |
| 2026-06-17 12:00 |
21:22:41.77 |
+20:08:53.4 |
HIP 105517 |
9.97 |
| 2026-06-18 00:00 |
21:22:40.62 |
+20:09:01.2 |
HIP 105517 |
9.91 |
| 2026-06-18 12:00 |
21:22:39.45 |
+20:09:08.8 |
HIP 105517 |
9.86 |
| 2026-06-19 00:00 |
21:22:38.27 |
+20:09:16.3 |
HIP 105517 |
9.81 |
| 2026-06-19 12:00 |
21:22:37.08 |
+20:09:23.6 |
HIP 105517 |
9.77 |
| 2026-06-20 00:00 |
21:22:35.88 |
+20:09:30.9 |
HIP 105517 |
9.74 |
| 2026-06-20 12:00 |
21:22:34.66 |
+20:09:37.9 |
HIP 105517 |
9.71 |
| 2026-06-21 00:00 |
21:22:33.43 |
+20:09:44.9 |
HIP 105517 |
9.69 |
| 2026-06-21 12:00 |
21:22:32.18 |
+20:09:51.7 |
HIP 105517 |
9.67 |
| 2026-06-22 00:00 |
21:22:30.93 |
+20:09:58.4 |
HIP 105517 |
9.67 |