메타데이터
| 항목 |
값 |
| Designation |
C/1984 W2 (Hartley) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1985-09-28T09:29:19.821120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:31Z |
| Obs used |
53 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1986-02-18.0000000 |
| e |
0.99947295 |
| q (au) |
4.000285 |
| a (au) |
7589.981412 |
| i (deg) |
89.326939 |
| Ω (om, deg) |
250.204076 |
| ω (w, deg) |
255.271872 |
| M (ma, deg) |
0.000213 |
밝기
산란 + 전체 선형
$$
M_a = (4.937 + 4.665\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
4.937 |
| n |
4.665 |
| gf |
1.000 |
| gb |
-0.502 |
| 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) |
| 2026-09-20 00:00 |
16:58:55.87 |
+23:33:03.8 |
HIP 83095 |
15.09 |
| 2026-09-20 12:00 |
16:58:56.31 |
+23:32:45.0 |
HIP 83095 |
15.41 |
| 2026-09-21 00:00 |
16:58:56.76 |
+23:32:26.1 |
HIP 83095 |
15.74 |
| 2026-09-21 12:00 |
16:58:57.23 |
+23:32:07.2 |
HIP 83095 |
16.07 |
| 2026-09-22 00:00 |
16:58:57.72 |
+23:31:48.4 |
HIP 83095 |
16.39 |
| 2026-09-22 12:00 |
16:58:58.22 |
+23:31:29.6 |
HIP 83095 |
16.72 |
| 2026-09-23 00:00 |
16:58:58.74 |
+23:31:10.9 |
HIP 83095 |
17.05 |
| 2026-09-23 12:00 |
16:58:59.27 |
+23:30:52.1 |
HIP 83095 |
17.38 |
| 2026-09-24 00:00 |
16:58:59.83 |
+23:30:33.4 |
HIP 83095 |
17.70 |
| 2026-09-24 12:00 |
16:59:00.40 |
+23:30:14.7 |
HIP 83095 |
18.03 |
| 2026-09-25 00:00 |
16:59:00.98 |
+23:29:56.1 |
HIP 83095 |
18.36 |
| 2026-09-25 12:00 |
16:59:01.58 |
+23:29:37.5 |
HIP 83095 |
18.69 |
| 2026-09-26 00:00 |
16:59:02.20 |
+23:29:18.9 |
HIP 83095 |
19.02 |
| 2026-09-26 12:00 |
16:59:02.84 |
+23:29:00.3 |
HIP 83095 |
19.35 |
| 2026-09-27 00:00 |
16:59:03.49 |
+23:28:41.8 |
HIP 83095 |
19.68 |
| 2026-09-27 12:00 |
16:59:04.16 |
+23:28:23.4 |
HIP 83095 |
20.02 |
| 2026-09-28 00:00 |
16:59:04.84 |
+23:28:05.0 |
HIP 83095 |
20.35 |
| 2026-09-28 12:00 |
16:59:05.54 |
+23:27:46.6 |
HIP 83095 |
20.68 |
| 2026-09-29 00:00 |
16:59:06.25 |
+23:27:28.2 |
HIP 83095 |
21.01 |
| 2026-09-29 12:00 |
16:59:06.99 |
+23:27:09.9 |
HIP 83095 |
21.35 |
| 2026-09-30 00:00 |
16:59:07.73 |
+23:26:51.7 |
HIP 83095 |
21.68 |
| 2026-09-30 12:00 |
16:59:08.50 |
+23:26:33.5 |
HIP 83095 |
22.02 |
| 2026-10-01 00:00 |
16:59:09.28 |
+23:26:15.3 |
HIP 83095 |
22.35 |
| 2026-10-01 12:00 |
16:59:10.07 |
+23:25:57.2 |
HIP 83095 |
22.69 |
| 2026-10-02 00:00 |
16:59:10.88 |
+23:25:39.2 |
HIP 83095 |
23.03 |
| 2026-10-02 12:00 |
16:59:11.71 |
+23:25:21.2 |
HIP 83095 |
23.36 |
| 2026-10-03 00:00 |
16:59:12.55 |
+23:25:03.3 |
HIP 83095 |
23.70 |
| 2026-10-03 12:00 |
16:59:13.41 |
+23:24:45.4 |
HIP 83095 |
24.04 |
| 2026-10-04 00:00 |
16:59:14.29 |
+23:24:27.5 |
HIP 83095 |
24.38 |
| 2026-10-04 12:00 |
16:59:15.18 |
+23:24:09.8 |
HIP 83095 |
24.72 |
| 2026-10-05 00:00 |
16:59:16.08 |
+23:23:52.0 |
HIP 83095 |
25.06 |
| 2026-10-05 12:00 |
16:59:17.00 |
+23:23:34.4 |
HIP 83095 |
25.40 |
| 2026-10-06 00:00 |
16:59:17.94 |
+23:23:16.8 |
HIP 83095 |
25.74 |
| 2026-10-06 12:00 |
16:59:18.89 |
+23:22:59.3 |
HIP 83095 |
26.08 |
| 2026-10-07 00:00 |
16:59:19.86 |
+23:22:41.8 |
HIP 83095 |
26.42 |
| 2026-10-07 12:00 |
16:59:20.84 |
+23:22:24.4 |
HIP 83095 |
26.76 |
| 2026-10-08 00:00 |
16:59:21.84 |
+23:22:07.1 |
HIP 83095 |
27.11 |
| 2026-10-08 12:00 |
16:59:22.85 |
+23:21:49.8 |
HIP 83095 |
27.45 |
| 2026-10-09 00:00 |
16:59:23.88 |
+23:21:32.6 |
HIP 83095 |
27.79 |
| 2026-10-09 12:00 |
16:59:24.92 |
+23:21:15.5 |
HIP 83095 |
28.14 |
| 2026-10-10 00:00 |
16:59:25.98 |
+23:20:58.5 |
HIP 83095 |
28.49 |
| 2026-10-10 12:00 |
16:59:27.05 |
+23:20:41.5 |
HIP 83095 |
28.83 |
| 2026-10-11 00:00 |
16:59:28.14 |
+23:20:24.6 |
HIP 83095 |
29.18 |