메타데이터
| 항목 |
값 |
| Designation |
P/2018 H2 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-01-23T11:01:35.495040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:43Z |
| Obs used |
169 |
| NEO |
- |
| M1 |
17.000 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2018-04-16T12:40:08.832000Z |
| Discovery magnitude (MPC) |
19.90 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2018-04-26.0000000 |
| e |
0.54004634 |
| q (au) |
2.027090 |
| a (au) |
4.407161 |
| i (deg) |
7.388853 |
| Ω (om, deg) |
68.455880 |
| ω (w, deg) |
120.229629 |
| M (ma, deg) |
9.858205 |
밝기
산란 + 전체 선형
$$
M_a = (18.665 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
18.665 |
| n |
2.000 |
| gf |
0.987 |
| gb |
-0.786 |
| k |
0.943 |
| δ90 |
5.365 |
| 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
찾아보기
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
04:38:22.41 |
+24:25:37.1 |
HIP 21591 |
8.13 |
| 2026-03-26 12:00 |
04:38:49.80 |
+24:26:43.6 |
HIP 21591 |
11.18 |
| 2026-03-27 00:00 |
04:39:17.41 |
+24:27:50.2 |
HIP 21591 |
16.30 |
| 2026-03-27 12:00 |
04:39:45.22 |
+24:28:56.9 |
HIP 21768 |
11.06 |
| 2026-03-28 00:00 |
04:40:13.23 |
+24:30:03.7 |
HIP 21768 |
5.66 |
| 2026-03-28 12:00 |
04:40:41.46 |
+24:31:10.6 |
HIP 21768 |
5.07 |
| 2026-03-29 00:00 |
04:41:09.88 |
+24:32:17.5 |
HIP 21768 |
10.25 |
| 2026-03-29 12:00 |
04:41:38.51 |
+24:33:24.6 |
HIP 21768 |
16.49 |
| 2026-03-30 00:00 |
04:42:07.35 |
+24:34:31.6 |
HIP 21768 |
22.98 |
| 2026-03-30 12:00 |
04:42:36.38 |
+24:35:38.7 |
HIP 21768 |
29.59 |
| 2026-03-31 00:00 |
04:43:05.61 |
+24:36:45.9 |
HIP 21961 |
31.48 |
| 2026-03-31 12:00 |
04:43:35.04 |
+24:37:53.1 |
HIP 22096 |
26.96 |
| 2026-04-01 00:00 |
04:44:04.67 |
+24:39:00.3 |
HIP 22096 |
22.07 |
| 2026-04-01 12:00 |
04:44:34.50 |
+24:40:07.5 |
HIP 22096 |
18.43 |
| 2026-04-02 00:00 |
04:45:04.52 |
+24:41:14.7 |
HIP 22096 |
16.93 |
| 2026-04-02 12:00 |
04:45:34.74 |
+24:42:21.9 |
HIP 22096 |
18.15 |
| 2026-04-03 00:00 |
04:46:05.15 |
+24:43:29.2 |
HIP 22096 |
21.68 |
| 2026-04-03 12:00 |
04:46:35.75 |
+24:44:36.4 |
HIP 22096 |
26.66 |
| 2026-04-04 00:00 |
04:47:06.55 |
+24:45:43.6 |
HIP 22334 |
20.26 |
| 2026-04-04 12:00 |
04:47:37.53 |
+24:46:50.7 |
HIP 22334 |
13.39 |
| 2026-04-05 00:00 |
04:48:08.71 |
+24:47:57.8 |
HIP 22334 |
6.98 |
| 2026-04-05 12:00 |
04:48:40.07 |
+24:49:04.9 |
HIP 22334 |
4.60 |
| 2026-04-06 00:00 |
04:49:11.63 |
+24:50:11.9 |
HIP 22394 |
2.04 |
| 2026-04-06 12:00 |
04:49:43.37 |
+24:51:18.8 |
HIP 22394 |
7.58 |
| 2026-04-07 00:00 |
04:50:15.30 |
+24:52:25.7 |
HIP 22394 |
14.77 |
| 2026-04-07 12:00 |
04:50:47.41 |
+24:53:32.5 |
HIP 22394 |
22.09 |
| 2026-04-08 00:00 |
04:51:19.71 |
+24:54:39.2 |
HIP 22725 |
26.92 |
| 2026-04-08 12:00 |
04:51:52.19 |
+24:55:45.8 |
HIP 22725 |
19.62 |
| 2026-04-09 00:00 |
04:52:24.85 |
+24:56:52.4 |
HIP 22725 |
12.44 |
| 2026-04-09 12:00 |
04:52:57.70 |
+24:57:58.8 |
HIP 22725 |
6.05 |
| 2026-04-10 00:00 |
04:53:30.73 |
+24:59:05.1 |
HIP 22725 |
5.66 |
| 2026-04-10 12:00 |
04:54:03.94 |
+25:00:11.2 |
HIP 22725 |
11.95 |
| 2026-04-11 00:00 |
04:54:37.32 |
+25:01:17.3 |
HIP 22877 |
17.71 |
| 2026-04-11 12:00 |
04:55:10.89 |
+25:02:23.2 |
HIP 22877 |
14.30 |
| 2026-04-12 00:00 |
04:55:44.64 |
+25:03:28.9 |
HIP 22877 |
14.62 |
| 2026-04-12 12:00 |
04:56:18.56 |
+25:04:34.5 |
HIP 23032 |
13.68 |
| 2026-04-13 00:00 |
04:56:52.66 |
+25:05:39.9 |
HIP 23032 |
9.30 |
| 2026-04-13 12:00 |
04:57:26.93 |
+25:06:45.2 |
HIP 23088 |
10.31 |
| 2026-04-14 00:00 |
04:58:01.38 |
+25:07:50.2 |
HIP 23088 |
5.14 |
| 2026-04-14 12:00 |
04:58:36.00 |
+25:08:55.1 |
HIP 23088 |
8.43 |
| 2026-04-15 00:00 |
04:59:10.80 |
+25:09:59.8 |
HIP 23259 |
15.20 |
| 2026-04-15 12:00 |
04:59:45.76 |
+25:11:04.3 |
HIP 23259 |
7.74 |
| 2026-04-16 00:00 |
05:00:20.90 |
+25:12:08.5 |
HIP 23259 |
4.03 |