메타데이터
| 항목 |
값 |
| Designation |
C/2022 D2 (Kowalski) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2022-03-27T13:51:54.040320Z |
| Orbit solution date (soln_date, UTC) |
2022-05-19T21:13:31Z |
| Obs used |
112 |
| NEO |
- |
| M1 |
14.100 |
| K1 |
25.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-02-25T02:54:45.244800Z |
| Discovery magnitude (MPC) |
19.85 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2022-03-11.0000000 |
| e |
0.99563301 |
| q (au) |
1.555140 |
| a (au) |
356.112305 |
| i (deg) |
22.654502 |
| Ω (om, deg) |
312.470402 |
| ω (w, deg) |
177.792237 |
| M (ma, deg) |
359.997569 |
밝기
산란 + 전체 선형
$$
M_a = (15.407 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
15.407 |
| n |
6.000 |
| 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 |
18:28:06.22 |
-39:12:37.0 |
HIP 90435 |
11.62 |
| 2026-05-12 12:00 |
18:27:59.02 |
-39:13:02.2 |
HIP 90435 |
10.16 |
| 2026-05-13 00:00 |
18:27:51.75 |
-39:13:27.1 |
HIP 90435 |
8.69 |
| 2026-05-13 12:00 |
18:27:44.39 |
-39:13:51.9 |
HIP 90435 |
7.21 |
| 2026-05-14 00:00 |
18:27:36.96 |
-39:14:16.4 |
HIP 90435 |
5.72 |
| 2026-05-14 12:00 |
18:27:29.45 |
-39:14:40.7 |
HIP 90435 |
4.21 |
| 2026-05-15 00:00 |
18:27:21.87 |
-39:15:04.8 |
HIP 90435 |
2.70 |
| 2026-05-15 12:00 |
18:27:14.21 |
-39:15:28.7 |
HIP 90435 |
1.18 |
| 2026-05-16 00:00 |
18:27:06.47 |
-39:15:52.3 |
HIP 90435 |
0.48 |
| 2026-05-16 12:00 |
18:26:58.66 |
-39:16:15.7 |
HIP 90435 |
1.98 |
| 2026-05-17 00:00 |
18:26:50.78 |
-39:16:38.8 |
HIP 90435 |
3.54 |
| 2026-05-17 12:00 |
18:26:42.83 |
-39:17:01.7 |
HIP 90435 |
5.13 |
| 2026-05-18 00:00 |
18:26:34.80 |
-39:17:24.4 |
HIP 90435 |
6.72 |
| 2026-05-18 12:00 |
18:26:26.70 |
-39:17:46.8 |
HIP 90435 |
8.33 |
| 2026-05-19 00:00 |
18:26:18.54 |
-39:18:08.9 |
HIP 90435 |
9.95 |
| 2026-05-19 12:00 |
18:26:10.30 |
-39:18:30.8 |
HIP 90435 |
11.58 |
| 2026-05-20 00:00 |
18:26:02.00 |
-39:18:52.4 |
HIP 90435 |
13.23 |
| 2026-05-20 12:00 |
18:25:53.63 |
-39:19:13.7 |
HIP 90435 |
14.89 |
| 2026-05-21 00:00 |
18:25:45.19 |
-39:19:34.8 |
HIP 90435 |
16.55 |
| 2026-05-21 12:00 |
18:25:36.69 |
-39:19:55.6 |
HIP 90435 |
18.23 |
| 2026-05-22 00:00 |
18:25:28.13 |
-39:20:16.2 |
HIP 90435 |
19.92 |
| 2026-05-22 12:00 |
18:25:19.50 |
-39:20:36.4 |
HIP 90435 |
21.62 |
| 2026-05-23 00:00 |
18:25:10.81 |
-39:20:56.4 |
HIP 90127 |
23.15 |
| 2026-05-23 12:00 |
18:25:02.05 |
-39:21:16.0 |
HIP 90127 |
21.59 |
| 2026-05-24 00:00 |
18:24:53.24 |
-39:21:35.4 |
HIP 90127 |
20.06 |
| 2026-05-24 12:00 |
18:24:44.36 |
-39:21:54.5 |
HIP 90127 |
18.56 |
| 2026-05-25 00:00 |
18:24:35.43 |
-39:22:13.3 |
HIP 90127 |
17.09 |
| 2026-05-25 12:00 |
18:24:26.44 |
-39:22:31.8 |
HIP 90112 |
15.54 |
| 2026-05-26 00:00 |
18:24:17.39 |
-39:22:50.0 |
HIP 90112 |
13.94 |
| 2026-05-26 12:00 |
18:24:08.29 |
-39:23:07.9 |
HIP 90112 |
12.38 |
| 2026-05-27 00:00 |
18:23:59.12 |
-39:23:25.5 |
HIP 90112 |
10.89 |
| 2026-05-27 12:00 |
18:23:49.91 |
-39:23:42.8 |
HIP 90112 |
9.50 |
| 2026-05-28 00:00 |
18:23:40.64 |
-39:23:59.8 |
HIP 90112 |
8.27 |
| 2026-05-28 12:00 |
18:23:31.32 |
-39:24:16.5 |
HIP 90112 |
7.28 |
| 2026-05-29 00:00 |
18:23:21.95 |
-39:24:32.8 |
HIP 90112 |
6.67 |
| 2026-05-29 12:00 |
18:23:12.52 |
-39:24:48.8 |
HIP 90112 |
6.53 |
| 2026-05-30 00:00 |
18:23:03.05 |
-39:25:04.5 |
HIP 90112 |
6.91 |
| 2026-05-30 12:00 |
18:22:53.52 |
-39:25:19.9 |
HIP 90112 |
7.74 |
| 2026-05-31 00:00 |
18:22:43.95 |
-39:25:35.0 |
HIP 90112 |
8.89 |
| 2026-05-31 12:00 |
18:22:34.33 |
-39:25:49.7 |
HIP 90112 |
10.26 |
| 2026-06-01 00:00 |
18:22:24.67 |
-39:26:04.1 |
HIP 90112 |
11.78 |
| 2026-06-01 12:00 |
18:22:14.96 |
-39:26:18.1 |
HIP 90112 |
13.41 |
| 2026-06-02 00:00 |
18:22:05.20 |
-39:26:31.8 |
HIP 89945 |
14.13 |