메타데이터
| 항목 |
값 |
| Designation |
C/2018 DO4 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-08-18T09:51:21.291840Z |
| Orbit solution date (soln_date, UTC) |
2022-06-28T08:33:35Z |
| Obs used |
660 |
| NEO |
- |
| M1 |
13.200 |
| K1 |
6.500 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2019-07-09.0000000 |
| e |
0.90695413 |
| q (au) |
2.405953 |
| a (au) |
25.857709 |
| i (deg) |
160.474821 |
| Ω (om, deg) |
251.132876 |
| ω (w, deg) |
175.974733 |
| M (ma, deg) |
359.697089 |
밝기
산란 + 전체 선형
$$
M_a = (7.922 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
7.922 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.901 |
| 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) |
| 2026-06-01 00:00 |
19:51:50.46 |
-34:31:44.6 |
HIP 97604 |
20.88 |
| 2026-06-01 12:00 |
19:51:42.95 |
-34:32:16.7 |
HIP 97604 |
19.25 |
| 2026-06-02 00:00 |
19:51:35.38 |
-34:32:48.8 |
HIP 97604 |
17.61 |
| 2026-06-02 12:00 |
19:51:27.76 |
-34:33:20.9 |
HIP 97604 |
15.96 |
| 2026-06-03 00:00 |
19:51:20.08 |
-34:33:52.9 |
HIP 97604 |
14.30 |
| 2026-06-03 12:00 |
19:51:12.34 |
-34:34:24.8 |
HIP 97604 |
12.63 |
| 2026-06-04 00:00 |
19:51:04.54 |
-34:34:56.6 |
HIP 97604 |
10.95 |
| 2026-06-04 12:00 |
19:50:56.69 |
-34:35:28.4 |
HIP 97604 |
9.27 |
| 2026-06-05 00:00 |
19:50:48.78 |
-34:36:00.2 |
HIP 97604 |
7.59 |
| 2026-06-05 12:00 |
19:50:40.82 |
-34:36:31.8 |
HIP 97604 |
5.93 |
| 2026-06-06 00:00 |
19:50:32.80 |
-34:37:03.4 |
HIP 97604 |
4.29 |
| 2026-06-06 12:00 |
19:50:24.73 |
-34:37:34.9 |
HIP 97604 |
2.77 |
| 2026-06-07 00:00 |
19:50:16.60 |
-34:38:06.3 |
HIP 97604 |
1.73 |
| 2026-06-07 12:00 |
19:50:08.42 |
-34:38:37.7 |
HIP 97604 |
2.12 |
| 2026-06-08 00:00 |
19:50:00.19 |
-34:39:08.9 |
HIP 97604 |
3.51 |
| 2026-06-08 12:00 |
19:49:51.90 |
-34:39:40.1 |
HIP 97604 |
5.14 |
| 2026-06-09 00:00 |
19:49:43.57 |
-34:40:11.1 |
HIP 97604 |
6.86 |
| 2026-06-09 12:00 |
19:49:35.18 |
-34:40:42.1 |
HIP 97604 |
8.62 |
| 2026-06-10 00:00 |
19:49:26.74 |
-34:41:13.0 |
HIP 97604 |
10.41 |
| 2026-06-10 12:00 |
19:49:18.25 |
-34:41:43.7 |
HIP 97604 |
12.21 |
| 2026-06-11 00:00 |
19:49:09.71 |
-34:42:14.4 |
HIP 97443 |
11.49 |
| 2026-06-11 12:00 |
19:49:01.12 |
-34:42:44.9 |
HIP 97443 |
10.23 |
| 2026-06-12 00:00 |
19:48:52.49 |
-34:43:15.4 |
HIP 97443 |
9.16 |
| 2026-06-12 12:00 |
19:48:43.80 |
-34:43:45.7 |
HIP 97443 |
8.36 |
| 2026-06-13 00:00 |
19:48:35.07 |
-34:44:15.9 |
HIP 97443 |
7.91 |
| 2026-06-13 12:00 |
19:48:26.29 |
-34:44:45.9 |
HIP 97443 |
7.89 |
| 2026-06-14 00:00 |
19:48:17.47 |
-34:45:15.9 |
HIP 97443 |
8.30 |
| 2026-06-14 12:00 |
19:48:08.60 |
-34:45:45.7 |
HIP 97443 |
9.09 |
| 2026-06-15 00:00 |
19:47:59.68 |
-34:46:15.3 |
HIP 97443 |
10.17 |
| 2026-06-15 12:00 |
19:47:50.72 |
-34:46:44.9 |
HIP 97443 |
11.47 |
| 2026-06-16 00:00 |
19:47:41.72 |
-34:47:14.3 |
HIP 97443 |
12.93 |
| 2026-06-16 12:00 |
19:47:32.68 |
-34:47:43.5 |
HIP 97443 |
14.49 |
| 2026-06-17 00:00 |
19:47:23.59 |
-34:48:12.6 |
HIP 97443 |
16.14 |
| 2026-06-17 12:00 |
19:47:14.46 |
-34:48:41.6 |
HIP 97443 |
17.85 |
| 2026-06-18 00:00 |
19:47:05.29 |
-34:49:10.3 |
HIP 97443 |
19.60 |
| 2026-06-18 12:00 |
19:46:56.09 |
-34:49:39.0 |
HIP 97443 |
21.40 |
| 2026-06-19 00:00 |
19:46:46.84 |
-34:50:07.4 |
HIP 97378 |
22.15 |
| 2026-06-19 12:00 |
19:46:37.56 |
-34:50:35.7 |
HIP 97378 |
22.53 |
| 2026-06-20 00:00 |
19:46:28.23 |
-34:51:03.9 |
HIP 97378 |
23.07 |
| 2026-06-20 12:00 |
19:46:18.88 |
-34:51:31.9 |
HIP 97378 |
23.77 |
| 2026-06-21 00:00 |
19:46:09.48 |
-34:51:59.6 |
HIP 97378 |
24.61 |
| 2026-06-21 12:00 |
19:46:00.05 |
-34:52:27.3 |
HIP 97104 |
25.09 |
| 2026-06-22 00:00 |
19:45:50.59 |
-34:52:54.7 |
HIP 97104 |
23.41 |