메타데이터
| 항목 |
값 |
| Designation |
18D/Perrine-Mrkos |
| Type |
D |
| Perihelion (tp_cal, UTC) |
1968-11-01T13:00:40.325760Z |
| Orbit solution date (soln_date, UTC) |
2002-02-22T17:02:43Z |
| Obs used |
16 |
| NEO |
Yes |
| M1 |
11.500 |
| K1 |
20.000 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1969-01-19.0000000 |
| e |
0.64258098 |
| q (au) |
1.272248 |
| a (au) |
3.559542 |
| i (deg) |
17.758983 |
| Ω (om, deg) |
240.875547 |
| ω (w, deg) |
166.050417 |
| M (ma, deg) |
11.514613 |
밝기
산란 + 전체 선형
$$
M_a = (12.123 + 4.437\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
12.123 |
| n |
4.437 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
09:50:03.02 |
-05:23:56.8 |
HIP 48272 |
27.15 |
| 2026-05-12 12:00 |
09:50:13.34 |
-05:22:28.0 |
HIP 48272 |
25.17 |
| 2026-05-13 00:00 |
09:50:23.84 |
-05:21:00.7 |
HIP 48272 |
23.43 |
| 2026-05-13 12:00 |
09:50:34.53 |
-05:19:35.0 |
HIP 48272 |
21.98 |
| 2026-05-14 00:00 |
09:50:45.40 |
-05:18:10.9 |
HIP 48272 |
20.92 |
| 2026-05-14 12:00 |
09:50:56.46 |
-05:16:48.2 |
HIP 48272 |
20.29 |
| 2026-05-15 00:00 |
09:51:07.70 |
-05:15:27.2 |
HIP 48272 |
20.17 |
| 2026-05-15 12:00 |
09:51:19.13 |
-05:14:07.6 |
HIP 48272 |
20.57 |
| 2026-05-16 00:00 |
09:51:30.73 |
-05:12:49.6 |
HIP 48272 |
21.48 |
| 2026-05-16 12:00 |
09:51:42.51 |
-05:11:33.2 |
HIP 48272 |
22.85 |
| 2026-05-17 00:00 |
09:51:54.47 |
-05:10:18.3 |
HIP 48272 |
24.61 |
| 2026-05-17 12:00 |
09:52:06.61 |
-05:09:04.9 |
HIP 48272 |
26.70 |
| 2026-05-18 00:00 |
09:52:18.92 |
-05:07:53.1 |
HIP 48272 |
29.05 |
| 2026-05-18 12:00 |
09:52:31.41 |
-05:06:42.8 |
HIP 48597 |
31.42 |
| 2026-05-19 00:00 |
09:52:44.06 |
-05:05:34.1 |
HIP 48597 |
28.20 |
| 2026-05-19 12:00 |
09:52:56.89 |
-05:04:26.9 |
HIP 48597 |
24.98 |
| 2026-05-20 00:00 |
09:53:09.88 |
-05:03:21.2 |
HIP 48597 |
21.77 |
| 2026-05-20 12:00 |
09:53:23.05 |
-05:02:17.1 |
HIP 48597 |
18.59 |
| 2026-05-21 00:00 |
09:53:36.38 |
-05:01:14.5 |
HIP 48597 |
15.47 |
| 2026-05-21 12:00 |
09:53:49.87 |
-05:00:13.4 |
HIP 48597 |
12.49 |
| 2026-05-22 00:00 |
09:54:03.53 |
-04:59:13.8 |
HIP 48597 |
9.83 |
| 2026-05-22 12:00 |
09:54:17.34 |
-04:58:15.8 |
HIP 48597 |
7.85 |
| 2026-05-23 00:00 |
09:54:31.32 |
-04:57:19.2 |
HIP 48597 |
7.19 |
| 2026-05-23 12:00 |
09:54:45.46 |
-04:56:24.2 |
HIP 48597 |
8.22 |
| 2026-05-24 00:00 |
09:54:59.75 |
-04:55:30.7 |
HIP 48674 |
9.77 |
| 2026-05-24 12:00 |
09:55:14.20 |
-04:54:38.6 |
HIP 48674 |
6.90 |
| 2026-05-25 00:00 |
09:55:28.80 |
-04:53:48.1 |
HIP 48674 |
5.19 |
| 2026-05-25 12:00 |
09:55:43.56 |
-04:52:59.1 |
HIP 48674 |
5.82 |
| 2026-05-26 00:00 |
09:55:58.47 |
-04:52:11.5 |
HIP 48674 |
8.33 |
| 2026-05-26 12:00 |
09:56:13.52 |
-04:51:25.4 |
HIP 48674 |
11.57 |
| 2026-05-27 00:00 |
09:56:28.73 |
-04:50:40.8 |
HIP 48674 |
15.11 |
| 2026-05-27 12:00 |
09:56:44.08 |
-04:49:57.7 |
HIP 48674 |
18.80 |
| 2026-05-28 00:00 |
09:56:59.58 |
-04:49:16.0 |
HIP 48674 |
22.58 |
| 2026-05-28 12:00 |
09:57:15.22 |
-04:48:35.8 |
HIP 48674 |
26.42 |
| 2026-05-29 00:00 |
09:57:31.00 |
-04:47:57.1 |
HIP 48674 |
30.32 |
| 2026-05-29 12:00 |
09:57:46.93 |
-04:47:19.8 |
HIP 48674 |
34.26 |
| 2026-05-30 00:00 |
09:58:03.00 |
-04:46:43.9 |
HIP 49021 |
33.22 |
| 2026-05-30 12:00 |
09:58:19.20 |
-04:46:09.5 |
HIP 49021 |
29.88 |
| 2026-05-31 00:00 |
09:58:35.55 |
-04:45:36.5 |
HIP 49021 |
26.71 |
| 2026-05-31 12:00 |
09:58:52.03 |
-04:45:05.0 |
HIP 49021 |
23.79 |
| 2026-06-01 00:00 |
09:59:08.65 |
-04:44:34.8 |
HIP 49021 |
21.24 |
| 2026-06-01 12:00 |
09:59:25.40 |
-04:44:06.2 |
HIP 49021 |
19.22 |
| 2026-06-02 00:00 |
09:59:42.28 |
-04:43:38.9 |
HIP 49021 |
17.94 |