| Parameter |
Value |
| Designation |
P/2017 B4 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-01-28T02:53:29.515200Z |
| Orbit solution date (soln_date, UTC) |
2026-03-31T09:42:32Z |
| Obs used |
124 |
| NEO |
- |
| M1 |
15.000 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-09-01.0000000 |
| e |
0.36178487 |
| q (au) |
2.796849 |
| a (au) |
4.382297 |
| i (deg) |
20.447212 |
| Ω (om, deg) |
120.712150 |
| ω (w, deg) |
16.557333 |
| M (ma, deg) |
101.621855 |
Magnitude
Scatter + Global Linear
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
10:18:50.38 |
+29:01:43.5 |
HIP 50650 |
24.30 |
| 2026-05-12 12:00 |
10:19:13.13 |
+28:58:54.9 |
HIP 50650 |
18.92 |
| 2026-05-13 00:00 |
10:19:36.11 |
+28:56:04.8 |
HIP 50650 |
13.76 |
| 2026-05-13 12:00 |
10:19:59.32 |
+28:53:13.3 |
HIP 50650 |
9.29 |
| 2026-05-14 00:00 |
10:20:22.75 |
+28:50:20.3 |
HIP 50650 |
7.16 |
| 2026-05-14 12:00 |
10:20:46.40 |
+28:47:26.0 |
HIP 50650 |
9.27 |
| 2026-05-15 00:00 |
10:21:10.26 |
+28:44:30.2 |
HIP 50730 |
13.00 |
| 2026-05-15 12:00 |
10:21:34.35 |
+28:41:33.1 |
HIP 50730 |
9.42 |
| 2026-05-16 00:00 |
10:21:58.64 |
+28:38:34.5 |
HIP 50730 |
9.05 |
| 2026-05-16 12:00 |
10:22:23.16 |
+28:35:34.7 |
HIP 50730 |
12.28 |
| 2026-05-17 00:00 |
10:22:47.88 |
+28:32:33.4 |
HIP 50730 |
17.24 |
| 2026-05-17 12:00 |
10:23:12.81 |
+28:29:30.9 |
HIP 50730 |
22.88 |
| 2026-05-18 00:00 |
10:23:37.95 |
+28:26:27.0 |
HIP 50730 |
28.83 |
| 2026-05-18 12:00 |
10:24:03.30 |
+28:23:21.8 |
HIP 50730 |
34.96 |
| 2026-05-19 00:00 |
10:24:28.85 |
+28:20:15.4 |
HIP 51134 |
30.38 |
| 2026-05-19 12:00 |
10:24:54.60 |
+28:17:07.7 |
HIP 51134 |
25.21 |
| 2026-05-20 00:00 |
10:25:20.54 |
+28:13:58.7 |
HIP 51134 |
20.75 |
| 2026-05-20 12:00 |
10:25:46.69 |
+28:10:48.5 |
HIP 51134 |
17.60 |
| 2026-05-21 00:00 |
10:26:13.03 |
+28:07:37.0 |
HIP 51134 |
16.58 |
| 2026-05-21 12:00 |
10:26:39.56 |
+28:04:24.4 |
HIP 51134 |
18.12 |
| 2026-05-22 00:00 |
10:27:06.28 |
+28:01:10.5 |
HIP 51134 |
21.73 |
| 2026-05-22 12:00 |
10:27:33.20 |
+27:57:55.5 |
HIP 51134 |
26.60 |
| 2026-05-23 00:00 |
10:28:00.29 |
+27:54:39.3 |
HIP 51406 |
26.64 |
| 2026-05-23 12:00 |
10:28:27.57 |
+27:51:21.9 |
HIP 51406 |
20.20 |
| 2026-05-24 00:00 |
10:28:55.04 |
+27:48:03.4 |
HIP 51406 |
14.13 |
| 2026-05-24 12:00 |
10:29:22.68 |
+27:44:43.8 |
HIP 51406 |
9.29 |
| 2026-05-25 00:00 |
10:29:50.50 |
+27:41:23.0 |
HIP 51406 |
8.35 |
| 2026-05-25 12:00 |
10:30:18.49 |
+27:38:01.2 |
HIP 51406 |
12.33 |
| 2026-05-26 00:00 |
10:30:46.66 |
+27:34:38.2 |
HIP 51440 |
15.52 |
| 2026-05-26 12:00 |
10:31:15.01 |
+27:31:14.2 |
HIP 51440 |
16.24 |
| 2026-05-27 00:00 |
10:31:43.52 |
+27:27:49.1 |
HIP 51440 |
19.74 |
| 2026-05-27 12:00 |
10:32:12.20 |
+27:24:22.9 |
HIP 51440 |
24.93 |
| 2026-05-28 00:00 |
10:32:41.04 |
+27:20:55.7 |
HIP 51664 |
26.80 |
| 2026-05-28 12:00 |
10:33:10.05 |
+27:17:27.4 |
HIP 51823 |
27.91 |
| 2026-05-29 00:00 |
10:33:39.22 |
+27:13:58.1 |
HIP 51823 |
21.23 |
| 2026-05-29 12:00 |
10:34:08.55 |
+27:10:27.8 |
HIP 51823 |
15.15 |
| 2026-05-30 00:00 |
10:34:38.04 |
+27:06:56.5 |
HIP 51823 |
10.85 |
| 2026-05-30 12:00 |
10:35:07.69 |
+27:03:24.2 |
HIP 51823 |
10.80 |
| 2026-05-31 00:00 |
10:35:37.49 |
+26:59:50.9 |
HIP 51823 |
15.12 |
| 2026-05-31 12:00 |
10:36:07.45 |
+26:56:16.7 |
HIP 51893 |
20.91 |
| 2026-06-01 00:00 |
10:36:37.56 |
+26:52:41.4 |
HIP 51893 |
25.38 |
| 2026-06-01 12:00 |
10:37:07.82 |
+26:49:05.2 |
HIP 52051 |
18.95 |
| 2026-06-02 00:00 |
10:37:38.22 |
+26:45:28.0 |
HIP 52051 |
11.63 |