| Parameter |
Value |
| Designation |
C/2017 D5 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-01-08T20:46:08.676480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:31Z |
| Obs used |
75 |
| NEO |
- |
| M1 |
14.700 |
| K1 |
13.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-03-05.0000000 |
| e |
0.98076543 |
| q (au) |
2.167199 |
| a (au) |
112.672079 |
| i (deg) |
131.038508 |
| Ω (om, deg) |
92.721040 |
| ω (w, deg) |
287.822322 |
| M (ma, deg) |
0.045436 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.560 + 5.726\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.560 |
| n |
5.726 |
| gf |
1.000 |
| gb |
-0.978 |
| k |
1.000 |
| 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 |
00:15:05.22 |
+51:56:04.2 |
HIP 1244 |
7.24 |
| 2026-06-01 12:00 |
00:15:07.49 |
+51:57:03.8 |
HIP 1244 |
6.22 |
| 2026-06-02 00:00 |
00:15:09.70 |
+51:58:03.5 |
HIP 1244 |
5.22 |
| 2026-06-02 12:00 |
00:15:11.85 |
+51:59:03.2 |
HIP 1244 |
4.24 |
| 2026-06-03 00:00 |
00:15:13.94 |
+52:00:03.0 |
HIP 1244 |
3.32 |
| 2026-06-03 12:00 |
00:15:15.98 |
+52:01:02.8 |
HIP 1244 |
2.51 |
| 2026-06-04 00:00 |
00:15:17.96 |
+52:02:02.7 |
HIP 1244 |
1.95 |
| 2026-06-04 12:00 |
00:15:19.88 |
+52:03:02.5 |
HIP 1244 |
1.86 |
| 2026-06-05 00:00 |
00:15:21.75 |
+52:04:02.5 |
HIP 1244 |
2.31 |
| 2026-06-05 12:00 |
00:15:23.55 |
+52:05:02.4 |
HIP 1244 |
3.07 |
| 2026-06-06 00:00 |
00:15:25.30 |
+52:06:02.4 |
HIP 1244 |
3.96 |
| 2026-06-06 12:00 |
00:15:26.99 |
+52:07:02.4 |
HIP 1244 |
4.90 |
| 2026-06-07 00:00 |
00:15:28.62 |
+52:08:02.4 |
HIP 1244 |
5.88 |
| 2026-06-07 12:00 |
00:15:30.19 |
+52:09:02.4 |
HIP 1244 |
6.87 |
| 2026-06-08 00:00 |
00:15:31.70 |
+52:10:02.4 |
HIP 1244 |
7.87 |
| 2026-06-08 12:00 |
00:15:33.15 |
+52:11:02.4 |
HIP 1244 |
8.88 |
| 2026-06-09 00:00 |
00:15:34.54 |
+52:12:02.5 |
HIP 1244 |
9.89 |
| 2026-06-09 12:00 |
00:15:35.87 |
+52:13:02.5 |
HIP 1244 |
10.90 |
| 2026-06-10 00:00 |
00:15:37.14 |
+52:14:02.5 |
HIP 1244 |
11.92 |
| 2026-06-10 12:00 |
00:15:38.35 |
+52:15:02.6 |
HIP 1244 |
12.93 |
| 2026-06-11 00:00 |
00:15:39.50 |
+52:16:02.6 |
HIP 1244 |
13.94 |
| 2026-06-11 12:00 |
00:15:40.59 |
+52:17:02.6 |
HIP 1244 |
14.95 |
| 2026-06-12 00:00 |
00:15:41.61 |
+52:18:02.5 |
HIP 1244 |
15.96 |
| 2026-06-12 12:00 |
00:15:42.58 |
+52:19:02.4 |
HIP 1244 |
16.97 |
| 2026-06-13 00:00 |
00:15:43.48 |
+52:20:02.4 |
HIP 1244 |
17.98 |
| 2026-06-13 12:00 |
00:15:44.31 |
+52:21:02.2 |
HIP 1204 |
18.39 |
| 2026-06-14 00:00 |
00:15:45.09 |
+52:22:02.0 |
HIP 1204 |
17.50 |
| 2026-06-14 12:00 |
00:15:45.80 |
+52:23:01.8 |
HIP 1204 |
16.61 |
| 2026-06-15 00:00 |
00:15:46.45 |
+52:24:01.6 |
HIP 1204 |
15.74 |
| 2026-06-15 12:00 |
00:15:47.04 |
+52:25:01.2 |
HIP 1204 |
14.87 |
| 2026-06-16 00:00 |
00:15:47.56 |
+52:26:00.9 |
HIP 1204 |
14.02 |
| 2026-06-16 12:00 |
00:15:48.02 |
+52:27:00.4 |
HIP 1204 |
13.19 |
| 2026-06-17 00:00 |
00:15:48.41 |
+52:27:59.9 |
HIP 1204 |
12.38 |
| 2026-06-17 12:00 |
00:15:48.74 |
+52:28:59.3 |
HIP 1204 |
11.59 |
| 2026-06-18 00:00 |
00:15:49.01 |
+52:29:58.7 |
HIP 1204 |
10.83 |
| 2026-06-18 12:00 |
00:15:49.21 |
+52:30:57.9 |
HIP 1204 |
10.10 |
| 2026-06-19 00:00 |
00:15:49.35 |
+52:31:57.1 |
HIP 1204 |
9.42 |
| 2026-06-19 12:00 |
00:15:49.43 |
+52:32:56.2 |
HIP 1204 |
8.79 |
| 2026-06-20 00:00 |
00:15:49.43 |
+52:33:55.2 |
HIP 1204 |
8.21 |
| 2026-06-20 12:00 |
00:15:49.38 |
+52:34:54.1 |
HIP 1204 |
7.72 |
| 2026-06-21 00:00 |
00:15:49.26 |
+52:35:52.9 |
HIP 1204 |
7.31 |
| 2026-06-21 12:00 |
00:15:49.07 |
+52:36:51.5 |
HIP 1204 |
7.01 |
| 2026-06-22 00:00 |
00:15:48.82 |
+52:37:50.1 |
HIP 1204 |
6.82 |