메타데이터
| 항목 |
값 |
| Designation |
38P/Stephan-Oterma |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-11-10T23:41:26.018880Z |
| Orbit solution date (soln_date, UTC) |
2024-12-04T09:13:02Z |
| Obs used |
3293 |
| NEO |
- |
| M1 |
11.600 |
| K1 |
9.500 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2018-05-28.0000000 |
| e |
0.85928734 |
| q (au) |
1.588509 |
| a (au) |
11.289028 |
| i (deg) |
18.352950 |
| Ω (om, deg) |
78.000299 |
| ω (w, deg) |
359.588512 |
| M (ma, deg) |
355.660875 |
밝기
산란 + 전체 선형
$$
M_a = (10.431 + 3.907\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
10.431 |
| n |
3.907 |
| gf |
1.000 |
| gb |
-0.500 |
| 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 |
| 2017-06-24 |
2018-11-10 |
+2.8190 |
-1.701 |
| 2018-11-11 |
2020-05-21 |
+1.0455 |
-0.769 |
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 |
15:49:42.44 |
-13:20:13.9 |
HIP 77609 |
14.32 |
| 2026-06-01 12:00 |
15:49:35.34 |
-13:19:58.1 |
HIP 77609 |
16.06 |
| 2026-06-02 00:00 |
15:49:28.26 |
-13:19:42.5 |
HIP 77609 |
17.80 |
| 2026-06-02 12:00 |
15:49:21.19 |
-13:19:27.1 |
HIP 77433 |
17.24 |
| 2026-06-03 00:00 |
15:49:14.14 |
-13:19:11.8 |
HIP 77433 |
16.08 |
| 2026-06-03 12:00 |
15:49:07.10 |
-13:18:56.6 |
HIP 77433 |
15.04 |
| 2026-06-04 00:00 |
15:49:00.09 |
-13:18:41.6 |
HIP 77433 |
14.13 |
| 2026-06-04 12:00 |
15:48:53.09 |
-13:18:26.8 |
HIP 77433 |
13.39 |
| 2026-06-05 00:00 |
15:48:46.12 |
-13:18:12.1 |
HIP 77433 |
12.83 |
| 2026-06-05 12:00 |
15:48:39.17 |
-13:17:57.6 |
HIP 77433 |
12.48 |
| 2026-06-06 00:00 |
15:48:32.23 |
-13:17:43.3 |
HIP 77433 |
12.36 |
| 2026-06-06 12:00 |
15:48:25.32 |
-13:17:29.1 |
HIP 77433 |
12.47 |
| 2026-06-07 00:00 |
15:48:18.43 |
-13:17:15.1 |
HIP 77433 |
12.80 |
| 2026-06-07 12:00 |
15:48:11.57 |
-13:17:01.3 |
HIP 77433 |
13.34 |
| 2026-06-08 00:00 |
15:48:04.73 |
-13:16:47.6 |
HIP 77433 |
14.06 |
| 2026-06-08 12:00 |
15:47:57.91 |
-13:16:34.1 |
HIP 77433 |
14.92 |
| 2026-06-09 00:00 |
15:47:51.12 |
-13:16:20.8 |
HIP 77433 |
15.91 |
| 2026-06-09 12:00 |
15:47:44.35 |
-13:16:07.7 |
HIP 77433 |
17.00 |
| 2026-06-10 00:00 |
15:47:37.61 |
-13:15:54.8 |
HIP 77433 |
18.17 |
| 2026-06-10 12:00 |
15:47:30.89 |
-13:15:42.0 |
HIP 77433 |
19.40 |
| 2026-06-11 00:00 |
15:47:24.21 |
-13:15:29.4 |
HIP 77433 |
20.68 |
| 2026-06-11 12:00 |
15:47:17.55 |
-13:15:17.0 |
HIP 77433 |
22.01 |
| 2026-06-12 00:00 |
15:47:10.92 |
-13:15:04.8 |
HIP 77433 |
23.36 |
| 2026-06-12 12:00 |
15:47:04.31 |
-13:14:52.8 |
HIP 77433 |
24.75 |
| 2026-06-13 00:00 |
15:46:57.74 |
-13:14:40.9 |
HIP 77433 |
26.15 |
| 2026-06-13 12:00 |
15:46:51.20 |
-13:14:29.3 |
HIP 77433 |
27.56 |
| 2026-06-14 00:00 |
15:46:44.69 |
-13:14:17.8 |
HIP 77433 |
28.99 |
| 2026-06-14 12:00 |
15:46:38.21 |
-13:14:06.6 |
HIP 77433 |
30.42 |
| 2026-06-15 00:00 |
15:46:31.77 |
-13:13:55.5 |
HIP 77433 |
31.87 |
| 2026-06-15 12:00 |
15:46:25.36 |
-13:13:44.6 |
HIP 77433 |
33.31 |
| 2026-06-16 00:00 |
15:46:18.98 |
-13:13:34.0 |
HIP 77433 |
34.76 |
| 2026-06-16 12:00 |
15:46:12.63 |
-13:13:23.5 |
HIP 77433 |
36.21 |
| 2026-06-17 00:00 |
15:46:06.32 |
-13:13:13.2 |
HIP 77433 |
37.65 |
| 2026-06-17 12:00 |
15:46:00.05 |
-13:13:03.2 |
HIP 77433 |
39.10 |
| 2026-06-18 00:00 |
15:45:53.81 |
-13:12:53.3 |
HIP 77433 |
40.54 |
| 2026-06-18 12:00 |
15:45:47.60 |
-13:12:43.7 |
HIP 76982 |
39.81 |
| 2026-06-19 00:00 |
15:45:41.44 |
-13:12:34.2 |
HIP 76982 |
38.31 |
| 2026-06-19 12:00 |
15:45:35.31 |
-13:12:25.0 |
HIP 76982 |
36.83 |
| 2026-06-20 00:00 |
15:45:29.22 |
-13:12:16.0 |
HIP 76982 |
35.35 |
| 2026-06-20 12:00 |
15:45:23.17 |
-13:12:07.1 |
HIP 76982 |
33.89 |
| 2026-06-21 00:00 |
15:45:17.16 |
-13:11:58.5 |
HIP 76982 |
32.44 |
| 2026-06-21 12:00 |
15:45:11.18 |
-13:11:50.1 |
HIP 76982 |
31.00 |
| 2026-06-22 00:00 |
15:45:05.25 |
-13:11:41.9 |
HIP 76982 |
29.58 |