메타데이터
| 항목 |
값 |
| Designation |
50P/Arend |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2007-11-02T19:43:29.481600Z |
| Orbit solution date (soln_date, UTC) |
2025-10-01T16:07:23Z |
| Obs used |
1874 |
| NEO |
- |
| M1 |
13.900 |
| K1 |
9.000 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2011-07-01.0000000 |
| e |
0.53063813 |
| q (au) |
1.918329 |
| a (au) |
4.087100 |
| i (deg) |
19.155639 |
| Ω (om, deg) |
355.310553 |
| ω (w, deg) |
49.039728 |
| M (ma, deg) |
159.384273 |
밝기
산란 + 전체 선형
$$
M_a = (12.457 + 4.038\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
12.457 |
| n |
4.038 |
| gf |
1.000 |
| gb |
-0.998 |
| k |
1.000 |
| δ90 |
10.000 |
| 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 |
| 2023-08-17 |
2024-05-13 |
+13.6006 |
-5.552 |
| 2024-05-13 |
2025-05-02 |
-14.3888 |
+6.578 |
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 |
11:58:10.89 |
-02:52:00.0 |
HIP 58237 |
23.00 |
| 2026-03-26 12:00 |
11:57:50.78 |
-02:50:45.0 |
HIP 58237 |
17.83 |
| 2026-03-27 00:00 |
11:57:30.73 |
-02:49:30.2 |
HIP 58237 |
12.67 |
| 2026-03-27 12:00 |
11:57:10.73 |
-02:48:15.3 |
HIP 58237 |
7.52 |
| 2026-03-28 00:00 |
11:56:50.79 |
-02:47:00.6 |
HIP 58237 |
2.40 |
| 2026-03-28 12:00 |
11:56:30.91 |
-02:45:45.9 |
HIP 58237 |
2.75 |
| 2026-03-29 00:00 |
11:56:11.10 |
-02:44:31.3 |
HIP 58237 |
7.84 |
| 2026-03-29 12:00 |
11:55:51.35 |
-02:43:16.9 |
HIP 58237 |
12.92 |
| 2026-03-30 00:00 |
11:55:31.67 |
-02:42:02.6 |
HIP 58237 |
17.99 |
| 2026-03-30 12:00 |
11:55:12.07 |
-02:40:48.4 |
HIP 58096 |
18.81 |
| 2026-03-31 00:00 |
11:54:52.54 |
-02:39:34.4 |
HIP 58096 |
17.08 |
| 2026-03-31 12:00 |
11:54:33.09 |
-02:38:20.7 |
HIP 58096 |
16.73 |
| 2026-04-01 00:00 |
11:54:13.73 |
-02:37:07.1 |
HIP 58096 |
17.84 |
| 2026-04-01 12:00 |
11:53:54.44 |
-02:35:53.7 |
HIP 58096 |
20.14 |
| 2026-04-02 00:00 |
11:53:35.25 |
-02:34:40.6 |
HIP 58096 |
23.28 |
| 2026-04-02 12:00 |
11:53:16.15 |
-02:33:27.8 |
HIP 58096 |
26.94 |
| 2026-04-03 00:00 |
11:52:57.13 |
-02:32:15.2 |
HIP 58096 |
30.94 |
| 2026-04-03 12:00 |
11:52:38.22 |
-02:31:02.9 |
HIP 57740 |
33.46 |
| 2026-04-04 00:00 |
11:52:19.40 |
-02:29:50.9 |
HIP 57740 |
28.62 |
| 2026-04-04 12:00 |
11:52:00.68 |
-02:28:39.2 |
HIP 57740 |
23.82 |
| 2026-04-05 00:00 |
11:51:42.07 |
-02:27:27.9 |
HIP 57740 |
19.05 |
| 2026-04-05 12:00 |
11:51:23.56 |
-02:26:16.9 |
HIP 57740 |
14.33 |
| 2026-04-06 00:00 |
11:51:05.16 |
-02:25:06.3 |
HIP 57740 |
9.68 |
| 2026-04-06 12:00 |
11:50:46.88 |
-02:23:56.1 |
HIP 57740 |
5.25 |
| 2026-04-07 00:00 |
11:50:28.70 |
-02:22:46.2 |
HIP 57740 |
2.41 |
| 2026-04-07 12:00 |
11:50:10.64 |
-02:21:36.8 |
HIP 57740 |
5.26 |
| 2026-04-08 00:00 |
11:49:52.70 |
-02:20:27.8 |
HIP 57740 |
9.61 |
| 2026-04-08 12:00 |
11:49:34.89 |
-02:19:19.3 |
HIP 57740 |
14.11 |
| 2026-04-09 00:00 |
11:49:17.19 |
-02:18:11.2 |
HIP 57740 |
18.62 |
| 2026-04-09 12:00 |
11:48:59.62 |
-02:17:03.6 |
HIP 57740 |
23.12 |
| 2026-04-10 00:00 |
11:48:42.18 |
-02:15:56.5 |
HIP 57740 |
27.60 |
| 2026-04-10 12:00 |
11:48:24.87 |
-02:14:49.9 |
HIP 57740 |
32.05 |
| 2026-04-11 00:00 |
11:48:07.70 |
-02:13:43.9 |
HIP 57740 |
36.47 |
| 2026-04-11 12:00 |
11:47:50.65 |
-02:12:38.3 |
HIP 57485 |
37.10 |
| 2026-04-12 00:00 |
11:47:33.75 |
-02:11:33.3 |
HIP 57485 |
34.83 |
| 2026-04-12 12:00 |
11:47:16.99 |
-02:10:28.9 |
HIP 57485 |
32.99 |
| 2026-04-13 00:00 |
11:47:00.36 |
-02:09:25.1 |
HIP 57485 |
31.65 |
| 2026-04-13 12:00 |
11:46:43.89 |
-02:08:21.8 |
HIP 57295 |
28.56 |
| 2026-04-14 00:00 |
11:46:27.55 |
-02:07:19.2 |
HIP 57295 |
24.35 |
| 2026-04-14 12:00 |
11:46:11.37 |
-02:06:17.2 |
HIP 57295 |
20.18 |
| 2026-04-15 00:00 |
11:45:55.34 |
-02:05:15.9 |
HIP 57295 |
16.06 |
| 2026-04-15 12:00 |
11:45:39.46 |
-02:04:15.2 |
HIP 57295 |
11.97 |
| 2026-04-16 00:00 |
11:45:23.73 |
-02:03:15.1 |
HIP 57295 |
7.94 |