메타데이터
| 항목 |
값 |
| 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 궤도요소
| 항목 |
값 |
| 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 |
밝기
산란 + 전체 선형
$$
M_a = (11.477 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
11.477 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.875 |
| δ90 |
1.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (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(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
11:05:11.73 |
+03:04:02.3 |
HIP 54117 |
13.23 |
| 2026-03-26 12:00 |
11:04:54.74 |
+03:05:15.6 |
HIP 54117 |
8.91 |
| 2026-03-27 00:00 |
11:04:37.87 |
+03:06:28.4 |
HIP 54117 |
4.80 |
| 2026-03-27 12:00 |
11:04:21.12 |
+03:07:40.7 |
HIP 54117 |
2.26 |
| 2026-03-28 00:00 |
11:04:04.48 |
+03:08:52.4 |
HIP 54117 |
4.98 |
| 2026-03-28 12:00 |
11:03:47.96 |
+03:10:03.7 |
HIP 54117 |
9.01 |
| 2026-03-29 00:00 |
11:03:31.56 |
+03:11:14.4 |
HIP 54117 |
13.18 |
| 2026-03-29 12:00 |
11:03:15.29 |
+03:12:24.5 |
HIP 54117 |
17.36 |
| 2026-03-30 00:00 |
11:02:59.14 |
+03:13:34.0 |
HIP 54117 |
21.52 |
| 2026-03-30 12:00 |
11:02:43.12 |
+03:14:43.0 |
HIP 54117 |
25.67 |
| 2026-03-31 00:00 |
11:02:27.23 |
+03:15:51.4 |
HIP 54117 |
29.78 |
| 2026-03-31 12:00 |
11:02:11.47 |
+03:16:59.2 |
HIP 53804 |
31.08 |
| 2026-04-01 00:00 |
11:01:55.84 |
+03:18:06.3 |
HIP 53807 |
27.92 |
| 2026-04-01 12:00 |
11:01:40.35 |
+03:19:12.9 |
HIP 53807 |
24.40 |
| 2026-04-02 00:00 |
11:01:24.99 |
+03:20:18.8 |
HIP 53807 |
21.08 |
| 2026-04-02 12:00 |
11:01:09.77 |
+03:21:24.0 |
HIP 53807 |
18.06 |
| 2026-04-03 00:00 |
11:00:54.69 |
+03:22:28.6 |
HIP 53807 |
15.49 |
| 2026-04-03 12:00 |
11:00:39.75 |
+03:23:32.6 |
HIP 53807 |
13.59 |
| 2026-04-04 00:00 |
11:00:24.95 |
+03:24:35.9 |
HIP 53807 |
12.64 |
| 2026-04-04 12:00 |
11:00:10.30 |
+03:25:38.5 |
HIP 53807 |
12.81 |
| 2026-04-05 00:00 |
10:59:55.79 |
+03:26:40.4 |
HIP 53807 |
14.03 |
| 2026-04-05 12:00 |
10:59:41.43 |
+03:27:41.6 |
HIP 53807 |
16.04 |
| 2026-04-06 00:00 |
10:59:27.21 |
+03:28:42.0 |
HIP 53807 |
18.56 |
| 2026-04-06 12:00 |
10:59:13.15 |
+03:29:41.8 |
HIP 53807 |
21.39 |
| 2026-04-07 00:00 |
10:58:59.24 |
+03:30:40.9 |
HIP 53807 |
24.40 |
| 2026-04-07 12:00 |
10:58:45.48 |
+03:31:39.2 |
HIP 53807 |
27.52 |
| 2026-04-08 00:00 |
10:58:31.87 |
+03:32:36.7 |
HIP 53512 |
26.09 |
| 2026-04-08 12:00 |
10:58:18.42 |
+03:33:33.5 |
HIP 53512 |
23.08 |
| 2026-04-09 00:00 |
10:58:05.13 |
+03:34:29.6 |
HIP 53512 |
20.24 |
| 2026-04-09 12:00 |
10:57:51.99 |
+03:35:24.9 |
HIP 53512 |
17.66 |
| 2026-04-10 00:00 |
10:57:39.02 |
+03:36:19.3 |
HIP 53512 |
15.42 |
| 2026-04-10 12:00 |
10:57:26.20 |
+03:37:13.1 |
HIP 53512 |
13.67 |
| 2026-04-11 00:00 |
10:57:13.55 |
+03:38:06.0 |
HIP 53512 |
12.58 |
| 2026-04-11 12:00 |
10:57:01.06 |
+03:38:58.1 |
HIP 53512 |
12.28 |
| 2026-04-12 00:00 |
10:56:48.73 |
+03:39:49.4 |
HIP 53512 |
12.81 |
| 2026-04-12 12:00 |
10:56:36.57 |
+03:40:39.8 |
HIP 53512 |
14.04 |
| 2026-04-13 00:00 |
10:56:24.57 |
+03:41:29.5 |
HIP 53512 |
15.78 |
| 2026-04-13 12:00 |
10:56:12.74 |
+03:42:18.3 |
HIP 53512 |
17.86 |
| 2026-04-14 00:00 |
10:56:01.09 |
+03:43:06.3 |
HIP 53512 |
20.16 |
| 2026-04-14 12:00 |
10:55:49.60 |
+03:43:53.4 |
HIP 53512 |
22.58 |
| 2026-04-15 00:00 |
10:55:38.28 |
+03:44:39.7 |
HIP 53512 |
25.09 |
| 2026-04-15 12:00 |
10:55:27.13 |
+03:45:25.1 |
HIP 53286 |
23.53 |
| 2026-04-16 00:00 |
10:55:16.15 |
+03:46:09.6 |
HIP 53286 |
20.96 |