| Parameter |
Value |
| Designation |
154P/Brewington |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-12-12T20:02:35.404800Z |
| Orbit solution date (soln_date, UTC) |
2025-04-11T15:12:51Z |
| Obs used |
2636 |
| NEO |
- |
| M1 |
11.400 |
| K1 |
15.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-04-27.0000000 |
| e |
0.67197880 |
| q (au) |
1.601379 |
| a (au) |
4.881937 |
| i (deg) |
17.885394 |
| Ω (om, deg) |
343.428377 |
| ω (w, deg) |
48.913742 |
| M (ma, deg) |
45.701350 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.477 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.477 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.875 |
| δ90 |
1.000 |
| 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 |
| 2024-05-25 |
2024-09-11 |
+15.8219 |
-4.860 |
| 2024-09-11 |
2025-03-06 |
+1.5067 |
-0.658 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
10:49:52.99 |
+04:03:18.4 |
HIP 52985 |
16.91 |
| 2026-05-12 12:00 |
10:49:51.53 |
+04:03:12.8 |
HIP 52985 |
17.14 |
| 2026-05-13 00:00 |
10:49:50.25 |
+04:03:06.2 |
HIP 52985 |
17.37 |
| 2026-05-13 12:00 |
10:49:49.15 |
+04:02:58.7 |
HIP 52985 |
17.60 |
| 2026-05-14 00:00 |
10:49:48.22 |
+04:02:50.3 |
HIP 52869 |
17.81 |
| 2026-05-14 12:00 |
10:49:47.46 |
+04:02:40.9 |
HIP 52869 |
17.58 |
| 2026-05-15 00:00 |
10:49:46.87 |
+04:02:30.5 |
HIP 52869 |
17.38 |
| 2026-05-15 12:00 |
10:49:46.46 |
+04:02:19.1 |
HIP 52869 |
17.21 |
| 2026-05-16 00:00 |
10:49:46.23 |
+04:02:06.9 |
HIP 52869 |
17.08 |
| 2026-05-16 12:00 |
10:49:46.16 |
+04:01:53.6 |
HIP 52869 |
16.99 |
| 2026-05-17 00:00 |
10:49:46.26 |
+04:01:39.4 |
HIP 52869 |
16.93 |
| 2026-05-17 12:00 |
10:49:46.54 |
+04:01:24.3 |
HIP 52869 |
16.91 |
| 2026-05-18 00:00 |
10:49:46.99 |
+04:01:08.2 |
HIP 52869 |
16.93 |
| 2026-05-18 12:00 |
10:49:47.61 |
+04:00:51.1 |
HIP 52869 |
17.00 |
| 2026-05-19 00:00 |
10:49:48.39 |
+04:00:33.1 |
HIP 52869 |
17.10 |
| 2026-05-19 12:00 |
10:49:49.35 |
+04:00:14.2 |
HIP 52869 |
17.25 |
| 2026-05-20 00:00 |
10:49:50.47 |
+03:59:54.3 |
HIP 52869 |
17.44 |
| 2026-05-20 12:00 |
10:49:51.76 |
+03:59:33.5 |
HIP 52869 |
17.68 |
| 2026-05-21 00:00 |
10:49:53.21 |
+03:59:11.7 |
HIP 52869 |
17.97 |
| 2026-05-21 12:00 |
10:49:54.83 |
+03:58:49.0 |
HIP 52869 |
18.30 |
| 2026-05-22 00:00 |
10:49:56.62 |
+03:58:25.4 |
HIP 52869 |
18.69 |
| 2026-05-22 12:00 |
10:49:58.57 |
+03:58:00.9 |
HIP 52869 |
19.12 |
| 2026-05-23 00:00 |
10:50:00.68 |
+03:57:35.4 |
HIP 52869 |
19.60 |
| 2026-05-23 12:00 |
10:50:02.95 |
+03:57:09.1 |
HIP 52869 |
20.14 |
| 2026-05-24 00:00 |
10:50:05.39 |
+03:56:41.8 |
HIP 52869 |
20.72 |
| 2026-05-24 12:00 |
10:50:07.98 |
+03:56:13.5 |
HIP 52869 |
21.36 |
| 2026-05-25 00:00 |
10:50:10.74 |
+03:55:44.4 |
HIP 52869 |
22.05 |
| 2026-05-25 12:00 |
10:50:13.65 |
+03:55:14.4 |
HIP 53026 |
22.56 |
| 2026-05-26 00:00 |
10:50:16.72 |
+03:54:43.5 |
HIP 53026 |
21.75 |
| 2026-05-26 12:00 |
10:50:19.95 |
+03:54:11.7 |
HIP 53026 |
20.91 |
| 2026-05-27 00:00 |
10:50:23.33 |
+03:53:39.0 |
HIP 53026 |
20.06 |
| 2026-05-27 12:00 |
10:50:26.87 |
+03:53:05.4 |
HIP 53026 |
19.19 |
| 2026-05-28 00:00 |
10:50:30.56 |
+03:52:30.9 |
HIP 53026 |
18.31 |
| 2026-05-28 12:00 |
10:50:34.41 |
+03:51:55.5 |
HIP 53026 |
17.42 |
| 2026-05-29 00:00 |
10:50:38.41 |
+03:51:19.3 |
HIP 53026 |
16.55 |
| 2026-05-29 12:00 |
10:50:42.56 |
+03:50:42.1 |
HIP 53026 |
15.68 |
| 2026-05-30 00:00 |
10:50:46.86 |
+03:50:04.1 |
HIP 53026 |
14.85 |
| 2026-05-30 12:00 |
10:50:51.32 |
+03:49:25.3 |
HIP 53026 |
14.05 |
| 2026-05-31 00:00 |
10:50:55.92 |
+03:48:45.5 |
HIP 53026 |
13.32 |
| 2026-05-31 12:00 |
10:51:00.67 |
+03:48:04.9 |
HIP 53026 |
12.67 |
| 2026-06-01 00:00 |
10:51:05.56 |
+03:47:23.5 |
HIP 53026 |
12.14 |
| 2026-06-01 12:00 |
10:51:10.61 |
+03:46:41.2 |
HIP 53026 |
11.74 |
| 2026-06-02 00:00 |
10:51:15.80 |
+03:45:58.0 |
HIP 53026 |
11.52 |