메타데이터
| 항목 |
값 |
| Designation |
39P/Oterma |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2023-04-09T06:48:51.543360Z |
| Orbit solution date (soln_date, UTC) |
2024-01-16T15:22:33Z |
| Obs used |
287 |
| NEO |
- |
| M1 |
6.800 |
| K1 |
14.750 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2014-12-03.0000000 |
| e |
0.22841232 |
| q (au) |
5.712314 |
| a (au) |
7.403325 |
| i (deg) |
1.478237 |
| Ω (om, deg) |
303.635589 |
| ω (w, deg) |
89.704331 |
| M (ma, deg) |
210.802445 |
밝기
산란 + 전체 선형
$$
M_a = (7.853 + 5.174\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
7.853 |
| n |
5.174 |
| gf |
1.000 |
| gb |
-1.000 |
| 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 |
| 2019-02-11 |
2022-08-03 |
-95.1181 |
+75.118 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
07:25:53.59 |
+21:47:27.9 |
HIP 36086 |
6.71 |
| 2026-06-01 12:00 |
07:26:14.18 |
+21:46:43.0 |
HIP 36086 |
6.98 |
| 2026-06-02 00:00 |
07:26:34.82 |
+21:45:57.9 |
HIP 36086 |
9.97 |
| 2026-06-02 12:00 |
07:26:55.51 |
+21:45:12.4 |
HIP 36152 |
13.12 |
| 2026-06-03 00:00 |
07:27:16.26 |
+21:44:26.7 |
HIP 36152 |
13.69 |
| 2026-06-03 12:00 |
07:27:37.07 |
+21:43:40.7 |
HIP 36307 |
15.42 |
| 2026-06-04 00:00 |
07:27:57.93 |
+21:42:54.3 |
HIP 36307 |
11.74 |
| 2026-06-04 12:00 |
07:28:18.85 |
+21:42:07.7 |
HIP 36307 |
9.27 |
| 2026-06-05 00:00 |
07:28:39.81 |
+21:41:20.9 |
HIP 36307 |
9.08 |
| 2026-06-05 12:00 |
07:29:00.83 |
+21:40:33.7 |
HIP 36307 |
11.30 |
| 2026-06-06 00:00 |
07:29:21.91 |
+21:39:46.3 |
HIP 36307 |
14.91 |
| 2026-06-06 12:00 |
07:29:43.03 |
+21:38:58.5 |
HIP 36307 |
19.15 |
| 2026-06-07 00:00 |
07:30:04.20 |
+21:38:10.5 |
HIP 36307 |
23.68 |
| 2026-06-07 12:00 |
07:30:25.43 |
+21:37:22.2 |
HIP 36307 |
28.38 |
| 2026-06-08 00:00 |
07:30:46.70 |
+21:36:33.6 |
HIP 36663 |
27.84 |
| 2026-06-08 12:00 |
07:31:08.02 |
+21:35:44.7 |
HIP 36663 |
23.07 |
| 2026-06-09 00:00 |
07:31:29.39 |
+21:34:55.6 |
HIP 36663 |
18.41 |
| 2026-06-09 12:00 |
07:31:50.81 |
+21:34:06.1 |
HIP 36663 |
14.01 |
| 2026-06-10 00:00 |
07:32:12.27 |
+21:33:16.4 |
HIP 36663 |
10.21 |
| 2026-06-10 12:00 |
07:32:33.78 |
+21:32:26.4 |
HIP 36663 |
7.97 |
| 2026-06-11 00:00 |
07:32:55.34 |
+21:31:36.1 |
HIP 36663 |
8.62 |
| 2026-06-11 12:00 |
07:33:16.93 |
+21:30:45.5 |
HIP 36663 |
11.70 |
| 2026-06-12 00:00 |
07:33:38.58 |
+21:29:54.6 |
HIP 36663 |
15.86 |
| 2026-06-12 12:00 |
07:34:00.26 |
+21:29:03.5 |
HIP 36663 |
20.47 |
| 2026-06-13 00:00 |
07:34:21.99 |
+21:28:12.0 |
HIP 36789 |
21.37 |
| 2026-06-13 12:00 |
07:34:43.76 |
+21:27:20.3 |
HIP 36789 |
22.33 |
| 2026-06-14 00:00 |
07:35:05.57 |
+21:26:28.3 |
HIP 36789 |
24.36 |
| 2026-06-14 12:00 |
07:35:27.42 |
+21:25:36.0 |
HIP 37084 |
24.93 |
| 2026-06-15 00:00 |
07:35:49.31 |
+21:24:43.4 |
HIP 37084 |
19.77 |
| 2026-06-15 12:00 |
07:36:11.24 |
+21:23:50.6 |
HIP 37084 |
14.60 |
| 2026-06-16 00:00 |
07:36:33.21 |
+21:22:57.5 |
HIP 37084 |
9.43 |
| 2026-06-16 12:00 |
07:36:55.21 |
+21:22:04.1 |
HIP 37084 |
4.30 |
| 2026-06-17 00:00 |
07:37:17.25 |
+21:21:10.4 |
HIP 37084 |
1.47 |
| 2026-06-17 12:00 |
07:37:39.33 |
+21:20:16.4 |
HIP 37084 |
6.34 |
| 2026-06-18 00:00 |
07:38:01.44 |
+21:19:22.2 |
HIP 37084 |
11.53 |
| 2026-06-18 12:00 |
07:38:23.58 |
+21:18:27.7 |
HIP 37084 |
16.75 |
| 2026-06-19 00:00 |
07:38:45.76 |
+21:17:32.9 |
HIP 37084 |
21.99 |
| 2026-06-19 12:00 |
07:39:07.97 |
+21:16:37.9 |
HIP 37214 |
24.25 |
| 2026-06-20 00:00 |
07:39:30.21 |
+21:15:42.5 |
HIP 37298 |
25.28 |
| 2026-06-20 12:00 |
07:39:52.48 |
+21:14:46.9 |
HIP 37442 |
22.22 |
| 2026-06-21 00:00 |
07:40:14.78 |
+21:13:51.1 |
HIP 37442 |
18.71 |
| 2026-06-21 12:00 |
07:40:37.11 |
+21:12:54.9 |
HIP 37442 |
16.19 |
| 2026-06-22 00:00 |
07:40:59.47 |
+21:11:58.5 |
HIP 37442 |
15.16 |