| Parameter |
Value |
| Designation |
P/2012 B1 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-07-23T03:26:57.641280Z |
| Orbit solution date (soln_date, UTC) |
2022-05-19T21:13:35Z |
| Obs used |
1189 |
| NEO |
- |
| M1 |
6.400 |
| K1 |
12.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-02-05.0000000 |
| e |
0.41050358 |
| q (au) |
3.825153 |
| a (au) |
6.488848 |
| i (deg) |
7.627784 |
| Ω (om, deg) |
36.194183 |
| ω (w, deg) |
162.183007 |
| M (ma, deg) |
349.973869 |
Magnitude
Scatter + Global Linear
$$
M_a = (3.981 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
3.981 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2011-12-31 |
2013-07-20 |
+5.5281 |
-3.279 |
| 2013-08-25 |
2015-06-10 |
+9.6303 |
-6.962 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
05:15:38.46 |
+27:20:58.2 |
HIP 24546 |
13.92 |
| 2026-07-29 12:00 |
05:15:56.03 |
+27:21:35.5 |
HIP 24546 |
13.91 |
| 2026-07-30 00:00 |
05:16:13.54 |
+27:22:12.8 |
HIP 24546 |
14.99 |
| 2026-07-30 12:00 |
05:16:30.98 |
+27:22:50.0 |
HIP 24581 |
16.40 |
| 2026-07-31 00:00 |
05:16:48.34 |
+27:23:27.1 |
HIP 24581 |
17.72 |
| 2026-07-31 12:00 |
05:17:05.64 |
+27:24:04.1 |
HIP 24581 |
19.73 |
| 2026-08-01 00:00 |
05:17:22.87 |
+27:24:41.1 |
HIP 24647 |
21.24 |
| 2026-08-01 12:00 |
05:17:40.03 |
+27:25:18.0 |
HIP 24647 |
21.06 |
| 2026-08-02 00:00 |
05:17:57.12 |
+27:25:54.8 |
HIP 24647 |
21.58 |
| 2026-08-02 12:00 |
05:18:14.13 |
+27:26:31.6 |
HIP 24647 |
22.73 |
| 2026-08-03 00:00 |
05:18:31.07 |
+27:27:08.3 |
HIP 24647 |
24.41 |
| 2026-08-03 12:00 |
05:18:47.93 |
+27:27:44.9 |
HIP 24896 |
21.37 |
| 2026-08-04 00:00 |
05:19:04.73 |
+27:28:21.5 |
HIP 24896 |
17.92 |
| 2026-08-04 12:00 |
05:19:21.44 |
+27:28:58.0 |
HIP 24896 |
14.65 |
| 2026-08-05 00:00 |
05:19:38.08 |
+27:29:34.4 |
HIP 24896 |
11.68 |
| 2026-08-05 12:00 |
05:19:54.64 |
+27:30:10.8 |
HIP 24896 |
9.29 |
| 2026-08-06 00:00 |
05:20:11.13 |
+27:30:47.1 |
HIP 24896 |
7.99 |
| 2026-08-06 12:00 |
05:20:27.53 |
+27:31:23.3 |
HIP 24896 |
8.29 |
| 2026-08-07 00:00 |
05:20:43.86 |
+27:31:59.5 |
HIP 24896 |
10.03 |
| 2026-08-07 12:00 |
05:21:00.10 |
+27:32:35.6 |
HIP 24896 |
12.60 |
| 2026-08-08 00:00 |
05:21:16.27 |
+27:33:11.7 |
HIP 24896 |
15.60 |
| 2026-08-08 12:00 |
05:21:32.35 |
+27:33:47.7 |
HIP 24896 |
18.80 |
| 2026-08-09 00:00 |
05:21:48.35 |
+27:34:23.6 |
HIP 24896 |
22.11 |
| 2026-08-09 12:00 |
05:22:04.26 |
+27:34:59.5 |
HIP 24896 |
25.48 |
| 2026-08-10 00:00 |
05:22:20.09 |
+27:35:35.3 |
HIP 24984 |
28.22 |
| 2026-08-10 12:00 |
05:22:35.83 |
+27:36:11.1 |
HIP 25112 |
29.93 |
| 2026-08-11 00:00 |
05:22:51.49 |
+27:36:46.8 |
HIP 25112 |
29.56 |
| 2026-08-11 12:00 |
05:23:07.05 |
+27:37:22.5 |
HIP 25112 |
29.61 |
| 2026-08-12 00:00 |
05:23:22.53 |
+27:37:58.1 |
HIP 25112 |
30.06 |
| 2026-08-12 12:00 |
05:23:37.92 |
+27:38:33.7 |
HIP 25112 |
30.88 |
| 2026-08-13 00:00 |
05:23:53.22 |
+27:39:09.2 |
HIP 25112 |
32.05 |
| 2026-08-13 12:00 |
05:24:08.43 |
+27:39:44.6 |
HIP 25112 |
33.52 |
| 2026-08-14 00:00 |
05:24:23.54 |
+27:40:20.0 |
HIP 25484 |
35.14 |
| 2026-08-14 12:00 |
05:24:38.57 |
+27:40:55.4 |
HIP 25484 |
31.91 |
| 2026-08-15 00:00 |
05:24:53.50 |
+27:41:30.7 |
HIP 25484 |
28.73 |
| 2026-08-15 12:00 |
05:25:08.33 |
+27:42:05.9 |
HIP 25484 |
25.61 |
| 2026-08-16 00:00 |
05:25:23.07 |
+27:42:41.2 |
HIP 25484 |
22.59 |
| 2026-08-16 12:00 |
05:25:37.71 |
+27:43:16.3 |
HIP 25484 |
19.67 |
| 2026-08-17 00:00 |
05:25:52.26 |
+27:43:51.5 |
HIP 25484 |
16.92 |
| 2026-08-17 12:00 |
05:26:06.71 |
+27:44:26.5 |
HIP 25484 |
14.40 |
| 2026-08-18 00:00 |
05:26:21.06 |
+27:45:01.6 |
HIP 25484 |
12.25 |
| 2026-08-18 12:00 |
05:26:35.31 |
+27:45:36.6 |
HIP 25484 |
10.68 |
| 2026-08-19 00:00 |
05:26:49.46 |
+27:46:11.5 |
HIP 25484 |
9.93 |